For the BMW 7 series (E32) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994 model year.
Fuse box in engine compartment.
fuse box location.
The fuse box (power distrbution box), with spare fuse, relays and plastic tweezers is located in the engine compartment on the left.
fuse box diagram (1987-1988).
legend.
Fuses | Amps | Circuits protected |
---|---|---|
1 | 7.5A | ABS (also fuses 17, 29) Stability control (ASC) Instruments (also fuses 12, 15, 17, 20, 29, 33) |
2 | 7.5A | Headlights and fog lights (also fuses 1, 3, 5, 7, 8, 10, 11, 13, 14) Bulb check control unit (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14, 21) Hazard warning lights Direction indicators (also fuses 3, 6, 10, 11) |
3 | 7.5A | Headlight washers (also fuses 4, 5, 17, 22, 44) Headlights and fog lights (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14) Hazard warning lights Direction indicators (also fuses 2, 6, 10, 11) Bulb check control unit (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14) |
4 | 7.5A | Parking lights Tail lights Engine compartment light(s) (also fuses 1, 5, 20) Headlight washers (also fuses 3, 5, 17, 22, 44) Bulb check control unit (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14) Headlights and fog lights (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14) Number plate light(s) Luggage compartment light(s) (also fuses 5, 33) Glovebox light Cigarette lighter Accessory socket (also fuses 5, 26, 33) |
5 | 10A | Headlight washers (also fuses 3, 4, 17, 22, 44) Headlights and fog lights (also fuses 1 – 4, 7, 8, 10, 11, 13, 14) Parking light Tail lights Engine compartment light(s) (also fuses 1, 4, 20) Number plate light(s) Luggage compartment light(s) (also fuses 4, 33) Interior lights (also fuses 17, 30, 33, 44) Glovebox light Cigarette lighter Accessory socket (also fuses 4, 26, 33) Heated seats (also fuses 16, 27, 29, 40) Bulb check control unit (also fuses 1 – 4, 7, 8, 10, 11, 13, 14) |
6 | 7.5A | Hazard warning lights Direction indicators (also fuses 2, 3, 10, 11) |
7 | 15A | Headlights Fog lights (also fuses 1 – 5, 8, 10, 11, 13, 14) Bulb check control unit (also fuses 1 – 5, 8, 10, 11, 13, 14) |
8 | 7.5A | Headlights Fog lights (also fuses 1 – 5, 7, 10, 11, 13, 14) Bulb check control unit (also fuses 1 – 5, 7, 10, 11, 13, 14) Heating and air conditioning (also fuses 9, 19, 20, 21, 29) |
9 | 15A | Horn Heating and air conditioning (also fuses 8, 19, 20, 21, 29) |
10 | 7.5A | Headlights Fog lights (also fuses 1 – 5, 7, 8, 11, 13, 14) Bulb check control unit (also fuses 1 – 5, 7, 8, 11, 13, 14) Hazard warning lights Direction indicators (also fuses 2, 3, 6, 11) |
11 | 7.5A | Hazard warning lights Direction indicators (also fuses 2, 3, 6, 10) |
12 | 15A | Mirrors (also fuses 17, 30) Heated washer jets Reversing light(s) Seat and mirror memory (also fuses 16 – 18, 30, 42, 44) Instruments (also fuses 15, 17, 20, 29, 33) Electronic damping control (EDC) |
13 | 7.5A | Headlights Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 14) Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 14) |
14 | 7.5A | Headlights Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 13) Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 13) |
15 | 7.5A | Wash/wipe system (also fuse 44) Check control (also fuses 1, 12, 17, 20, 29, 33) Auxiliary heater (also fuses 19 – 21, 51, 52) On-board computer (also fuses 17, 20) Cruise control (also fuses 1, 17) |
16 | 30A | Seat and mirror memory (also fuses 12, 17, 18, 30, 42) Heated seats (also fuses 5, 27, 29, 40) |
17 | 7.5A | Engine management (also fuses 1, 20) Charging system Starter motor Electronics box (E-box) cooling fan (also fuse 28) Transmission AEGS ABS (also fuses 1, 29) Stability control (ASC) Central locking (also fuse 30) Windows and sliding roof (also fuses 20, 30, 31, 44) Body control unit (also fuses 30, 44, 47) Headlight washers (also fuses 3 – 5, 15, 22, 44) Check control (also fuses 1, 12, 15, 20, 29, 33) Interior lights (also fuses 5, 30, 33, 44) Cruise control (also fuses 1, 15) Security system (also fuses 18, 20, 31) On-board computer (also fuses 15, 20) Remote control (also fuses 18, 31) Brake pad wear indicator (also fuses 1, 20) Mirrors (also fuses 12, 30); Mirror memory (also fuses 12, 16, 18, 30, 33, 42, 44) |
18 | 15A | Audio system (also fuse 41) Telephone Security system (also fuses 17, 20, 31) Remote control (also fuses 17, 31) Seat and mirror memory Seat belt latch (also fuses 31, 32) Trailer control unit (also fuse 22) |
19 | 30A | Heating Auxiliary heater Air conditioning |
20 | 7.5A | Engine management (also fuses 1, 17, 23) Instruments (also fuses 1, 12, 15, 17, 29, 33) Clock Air conditioning (also fuses 8, 9, 19, 21, 29) On-board computer (also fuses 15, 17) Parking lights Tail lights Engine compartment light(s) (also fuses 1, 4, 5, 15, 19) Brake pad wear indicator (also fuses 1, 17) Security system (also fuses 17, 18, 31) Central locking (also fuses 30, 31) Windows (also fuses 17, 30, 31, 44) |
21 | 7.5A | Heating Auxiliary heater Air conditioning |
22 | 30A | Headlight washers (also fuses 3 – 5, 17, 44) Trailer control unit (also fuse 18) Wiper pressure control (also fuse 44) |
23 | 7.5A | Injection control unit (also fuses 17, 24) |
24 | 7.5A | Injection control unit (also fuses 17, 23) |
25 | 7.5A | Cooling fan (also fuse 29) |
26 | 30A | Glovebox light Cigarette lighter Accessory socket (also fuses 4, 5, 33) |
27 | 30A | Heated seats (also fuses 5, 16, 29, 40) Head restraints (also fuses 29, 40) Electric seats (also fuses 29, 40, 42, 43) |
28 | 15A | Electronics box (E-box) cooling fan (also fuse 17) Power steering |
29 | 7.5A | ABS (also fuses 1, 17) Heating (also fuses 8, 9, 19, 20, 21) Cooling fan (also fuse 25) Air conditioning Head restraints (also fuses 27, 40) Heated seats (also fuses 5, 16, 27, 40) Instruments (also fuses 1, 12, 15, 17, 20, 33) electric seats (also fuses 27, 40, 42, 43) Heated rear windscreen (also fuses 21, 46) |
K1 | Starter system | |
K2 | Horn(s) | |
K3 | Discharge relay | |
K4 | Cooling fan | |
K5 | Washer pump | |
K7 | Parking lights | |
K8 | Heated windscreen | |
K9 | No information is available | |
K10 | ABS main relay (overvoltage protection) | |
K16 | Hazard warning lights | |
K19 | Air-conditioning compressor | |
K21 | Additional cooling fan, stage 1 | |
K22 | Additional cooling fan, stage 2 | |
K33 | Air-conditioning compressor clutch relay | |
N6 | Headlight washer control unit | |
N17 | Crash control unit | |
A3 | Bulb check control unit | |
A4 | Check control |
fuse box diagram (1989-1990).
legend.
Fuse 1
ABS (also fuse 17)
Stability control (ASC)
Alternator (also fuse 28)
Instruments (also fuses 12, 15, 17, 20, 29, 33)
Brake lights
Cruise control (also fuse 17)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
Engine management (also fuses 17, 20, 23)
Headlights and fog lights (also fuses 3 – 5, 7, 8, 10, 11, 13, 14)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 4, 5, 20)
Number plate light(s)
Luggage compartment light(s) (also fuses 4, 5, 33)
15.0 A
Fuse 2
Headlights and fog lights (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14, 21)
Hazard warning lights
Direction indicators (also fuses 3, 6, 10, 11)
Light switch (also fuses 3 – 5)
Crash sensor (also fuses 6, 10, 11)
7.5 A
Fuse 3
Body control unit (also fuses 4, 5, 15, 17, 30, 44, 47)
Headlight washers (also fuses 4, 5, 15, 17, 22, 44)
Headlights and fog lights (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 6, 10, 11)
Bulb check control unit (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Light switch (also fuses 4, 5)
7.5 A
Fuse 4
Body control unit (also fuses 3, 5, 15, 17, 30, 44, 47)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 5, 20)
Headlight washers (also fuses 3, 5, 17, 22, 44)
Bulb check control unit (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Headlights and fog lights (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Number plate light(s)
Luggage compartment light(s) (also fuses 1, 5, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 5, 15, 33)
Light switch (also fuses 2, 3, 5)
Interior lights (also fuses 5, 15, 17, 18, 30, 33, 44)
Mirror(s) (also fuses 5, 12, 30)
7.5 A
Fuse 5
Body control unit (also fuses 3, 4, 15, 17, 30, 44, 47)
Headlight washers (also fuses 3, 4, 17, 22, 44)
Headlights and fog lights (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Parking light
Tail lights
Engine compartment light(s) (also fuses 1, 4, 20)
Number plate light(s)
Luggage compartment light(s) (also fuses 1, 4, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 15, 26, 33)
Heated seats (also fuses 16, 27 – 29, 40)
Bulb check control unit (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Interior lights (also fuses 4, 15, 17, 18, 30, 33, 44)
Mirror(s) (also fuses 4, 12, 30)
Light switch (also fuses 2 – 4)
10.0 A
Fuse 6
Hazard warning lights
Direction indicators (also fuses 2, 3, 10, 11)
Crash sensor (also fuses 2, 10, 11)
7.5 A
Fuse 7
Headlights
Fog lights (also fuses 1 – 5, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 8, 10, 11, 13, 14)
15.0 A
Fuse 8
Headlights
Fog lights (also fuses 1 – 5, 7, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 10, 11, 13, 14)
7.5 A
Fuse 9
Horn
Heating and air conditioning (also fuses 9, 19, 20, 21, 29)
15.0 A
Fuse 10
Headlights and fog lights (also fuses 1 – 5, 7, 8, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 11)
Crash sensor (also fuses 2, 6, 11)
7.5 A
Fuse 11
Headlights and fog lights (also fuses 1 – 5, 7, 8, 10, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 10)
Crash sensor (also fuses 2, 6, 10)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
7.5 A
Fuse 12
Mirrors (also fuses 4, 5, 30)
Reversing light(s)
Seat and mirror memory (also fuses 16, 18, 30, 42)
Instruments (also fuses 1, 15, 17, 20, 29, 33)
Electronic damping control (EDC)
Heating and air conditioning (also fuses 21, 45)
15.0 A
Fuse 13
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 14)
7.5 A
Fuse 14
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 13)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 13)
7.5 A
Fuse 15
Body control unit (also fuses 3 – 5, 17, 30, 44, 47)
Wash/wipe system (also fuse 44)
Wiper pressure control (also fuses 22, 44)
Check control (also fuses 1, 12, 17, 20, 29, 33)
Auxiliary heater (also fuses 19 – 21, 51, 52)
On-board computer (also fuses 17, 20, 28)
Headlight washers (also fuses 3 – 5, 17, 22, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 26, 33)
Interior lights (also fuses 4, 5, 17, 18, 30, 33, 44)
7.5 A
Fuse 16
Seat and mirror memory (also fuses 12, 18, 30, 42)
Heated seats (also fuses 5, 27 – 29, 40)
30.0 A
Fuse 17
Body control unit (also fuses 3 – 5, 15, 30, 44, 47)
Engine management
Starter motor
Electronics box (E-box) cooling fan (also fuse 28)
Transmission AEGS
ABS (also fuses 1, 29)
Stability control (ASC)
Central locking
Windows and sliding roof (also fuses 20, 30, 31, 47)
Body control unit (also fuses 30, 44, 47)
Headlight washers (also fuses 3 – 5, 15, 22, 44)
Check control (also fuses 1, 12, 15, 20, 29, 33)
Interior lights (also fuses 5, 30, 33, 44)
Cruise control (also fuse 1)
Security system (also fuses 18, 31, 51)
On-board computer (also fuses 15, 20)
Remote control (also fuses 18, 31, 51)
Interior lights (also fuses 4, 5, 15, 18, 30, 33, 44)
Heated door locks (also fuse 30)
7.5 A
Fuse 18
Audio system (also fuse 41)
Telephone
Security system (also fuses 17, 31, 51)
Remote control (also fuses 17, 31, 51)
Seat and mirror memory
Trailer control unit (also fuses 22, 50)
Interior lights (also fuses 4, 5, 15, 17, 30, 33, 42)
Seats (also fuses 27, 29, 40, 42, 43)
Sunshade (also fuse 32)
15.0 A
Fuse 19
Heating
Auxiliary heater
Air conditioning
30.0 A
Fuse 20
Engine management (also fuses 1, 17)
Instruments (also fuses 1, 12, 15, 17, 29, 33)
Clock
Air conditioning (also fuses 9, 19, 21, 29)
On-board computer (also fuses 15, 17)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 4, 5)
Central locking (also fuses 30, 31, 47)
Windows and sliding roof (also fuses 17, 30, 31, 44)
Heating
Auxiliary heater
7.5 A
Fuse 21
Heating
Auxiliary heater
Air conditioning
7.5 A
Fuse 22
Trailer control unit (also fuses 18, 50)
Wiper pressure control (also fuses 15, 44)
Headlight washers (also fuses 3 – 5, 15, 17, 44)
30.0 A
Fuse 23
Engine management
7.5 A
Fuse 24
Engine management
7.5 A
Fuse 25
Additional cooling fan (also fuse 29)
30.0 A
Fuse 26
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 33)
30.0 A
Fuse 27
Heated seats (also fuses 5, 16, 28, 29, 40)
Head restraints (also fuses 29, 40)
Electric seats (also fuses 18, 29, 40, 42, 43)
30.0 A
Fuse 28
Engine management
Alternator (also fuse 1)
Electronics box (E-box) cooling fan (also fuse 17)
Power steering
Heated seats (also fuses 16, 27 – 29, 40, 42)
On-board computer (also fuses 15, 17, 20)
Telephone
Auxiliary heater (also fuses 15, 19 – 21)
Heated washer jets
15.0 A
Fuse 29
Stability control (ASC) (also fuses 1, 17)
Heating (also fuses 8, 9, 19, 20, 21)
Cooling fan (also fuse 25)
Air conditioning
Head restraints (also fuses 27, 40)
Heated seats (also fuses 5, 16, 27, 28, 40)
Instruments (also fuses 1, 12, 15, 17, 20, 33)
Electric seats (also fuses 18, 27, 40, 42, 43)
7.5 A
Relay K1
Starter system
Relay K2
Horn(s)
Relay K3
Discharge relay
Relay K4
Cooling fan
Relay K5
Washer pump
Relay K7
Parking lights
Relay K8
Heated windscreen
Relay K9
No information is available
Relay K10
ABS main relay (overvoltage protection)
Relay K16
Hazard warning lights
Relay K21
Additional cooling fan, stage 1
Relay K22
Additional cooling fan, stage 2
Relay K33
Air-conditioning compressor clutch relay
Relay K61
Discharge relay
N6
Headlight washer control unit
N17
Crash control unit
A3
Bulb check control unit
A4
Check control
fuse box diagram (1991).
legend.
Fuse 1
ABS
Stability control (ASC) (also fuse 17)
Instruments (also fuses 12, 15, 17, 20, 29, 33)
Brake lights
Cruise control (also fuse 17)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
Engine management (also fuses 17, 20)
Headlights and fog lights (also fuses 3 – 5, 7, 8, 10, 11, 13, 14)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 4, 5, 20)
Number plate light(s)
Luggage compartment light(s) (also fuses 4, 5, 33)
15.0 A
Fuse 2
Headlights and fog lights (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14, 21)
Hazard warning lights
Direction indicators (also fuses 3, 6, 10, 11)
Light switch (also fuses 3 – 5)
Crash sensor (also fuses 6, 10, 11)
7.5 A
Fuse 3
Body control unit (also fuses 4, 5, 15, 17, 30, 44, 47)
Headlight washers (also fuses 4, 5, 15, 17, 22, 44)
Headlights and fog lights (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 6, 10, 11)
Bulb check control unit (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Light switch (also fuses 4, 5)
7.5 A
Fuse 4
Body control unit (also fuses 3, 5, 15, 17, 30, 44, 47)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 5, 20)
Headlight washers (also fuses 3, 5, 17, 22, 44)
Bulb check control unit (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Headlights and fog lights (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Number plate light(s)
Luggage compartment light(s) (also fuses 1, 5, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 5, 15, 33)
Light switch (also fuses 2, 3, 5)
Mirror(s) (also fuses 5, 12, 30)
7.5 A
Fuse 5
Body control unit (also fuses 3, 4, 15, 17, 30, 44, 47)
Headlight washers (also fuses 3, 4, 17, 22, 44)
Headlights and fog lights (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Parking light
Tail lights
Engine compartment light(s) (also fuses 1, 4, 20)
Number plate light(s)
Luggage compartment light(s) (also fuses 1, 4, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 15, 26, 33)
Heated seats (also fuses 16, 27 – 29, 40)
Bulb check control unit (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Interior lights (also fuses 4, 15, 17, 18, 30, 33, 44)
Mirror(s) (also fuses 4, 12, 30)
Light switch (also fuses 2 – 4)
10.0 A
Fuse 6
Hazard warning lights
Direction indicators (also fuses 2, 3, 10, 11)
Crash sensor (also fuses 2, 10, 11)
15.0 A
Fuse 7
Headlights
Fog lights (also fuses 1 – 5, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 8, 10, 11, 13, 14)
15.0 A
Fuse 8
Headlights
Fog lights (also fuses 1 – 5, 7, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 10, 11, 13, 14)
7.5 A
Fuse 9
Horn
Heating and air conditioning (also fuses 9, 19, 20, 21, 29)
15.0 A
Fuse 10
Headlights and fog lights (also fuses 1 – 5, 7, 8, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 11)
Crash sensor (also fuses 2, 6, 11)
7.5 A
Fuse 11
Headlights and fog lights (also fuses 1 – 5, 7, 8, 10, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 10)
Crash sensor (also fuses 2, 6, 10)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
7.5 A
Fuse 12
Mirrors (also fuses 4, 5, 30)
Reversing light(s)
Seat and mirror memory (also fuses 16, 18, 30, 42)
Instruments (also fuses 1, 15, 17, 20, 29, 33)
Electronic damping control (EDC)
Heating and air conditioning (also fuses 21, 45)
15.0 A
Fuse 13
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 14)
7.5 A
Fuse 14
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 13)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 13)
7.5 A
Fuse 15
Body control unit (also fuses 3 – 5, 17, 30, 44, 47)
Wash/wipe system (also fuse 44)
Wiper pressure control (also fuses 22, 44)
Check control (also fuses 1, 12, 17, 20, 29, 33)
Auxiliary heater (also fuses 19 – 21, 51, 52)
On-board computer (also fuses 17, 20, 28)
Headlight washers (also fuses 3 – 5, 17, 22, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 26, 33)
Interior lights (also fuses 4, 5, 17, 18, 30, 33, 44)
7.5 A
Fuse 16
Seat and mirror memory (also fuses 12, 18, 30, 42)
Heated seats (also fuses 5, 27 – 29, 40)
Electric seats (also fuses 29, 40, 42, 43)
Steering column adjustment (also fuse 18)
30.0 A
Fuse 17
Body control unit (also fuses 3 – 5, 15, 30, 44, 47)
Engine management
Starter motor
Alternator
Electronics box (E-box) cooling fan (also fuse 28)
Transmission AEGS
ABS (also fuses 1, 29)
Stability control (ASC)
Windows and sliding roof (also fuses 20, 30, 31, 47)
Body control unit (also fuses 30, 44, 47)
Check control (also fuses 1, 12, 15, 20, 29, 33)
Interior lights (also fuses 5, 30, 33, 44)
Cruise control (also fuse 1)
Security system (also fuses 18, 20, 31, 51)
On-board computer (also fuses 15, 20)
Remote control (also fuses 18, 31, 51)
Headlight washers (also fuses 3 – 5, 15, 22, 44)
Interior lights (also fuses 4, 5, 15, 18, 30, 33, 44)
Heated door locks (also fuse 30)
7.5 A
Fuse 18
Audio system (also fuse 41)
Telephone
Security system (also fuses 17, 31, 51)
Remote control (also fuses 17, 31, 51)
Seat and mirror memory
Trailer control unit (also fuses 22, 50)
Interior lights (also fuses 4, 5, 15, 17, 30, 33, 42)
Seats (also fuses 27, 29, 40, 42, 43)
Sunshade (also fuse 32)
Steering column adjustment (also fuse 16)
15.0 A
Fuse 19
Heating
Auxiliary heater
Air conditioning
30.0 A
Fuse 20
Engine management (also fuses 1, 17)
Instruments (also fuses 1, 12, 15, 17, 29, 33)
Clock
Air conditioning (also fuses 9, 19, 21, 29)
On-board computer (also fuses 15, 17)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 4, 5)
Security system (also fuses 17, 18, 31, 51)
Central locking (also fuses 30, 31, 47)
Windows and sliding roof (also fuses 17, 30, 31, 44)
Heating
Auxiliary heater
7.5 A
Fuse 21
Heating
Auxiliary heater
Air conditioning
7.5 A
Fuse 22
Trailer control unit (also fuses 18, 50)
Wiper pressure control (also fuses 15, 44)
Headlight washers (also fuses 3 – 5, 15, 17, 44)
30.0 A
Fuse 23
Engine management
15.0 A
Fuse 24
Engine management
15.0 A
Fuse 25
Additional cooling fan (also fuse 29)
30.0 A
Fuse 26
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 33)
30.0 A
Fuse 27
Heated seats (also fuses 5, 16, 28, 29, 40)
Head restraints (also fuses 29, 40)
30.0 A
Fuse 28
Alternator (also fuse 17)
Electronics box (E-box) cooling fan (also fuse 17)
Power steering
Heated seats (also fuses 16, 27 – 29, 40, 42)
On-board computer (also fuses 12, 15, 17, 20)
Telephone
Auxiliary heater (also fuses 15, 19 – 21)
Heated washer jets
15.0 A
Fuse 29
Stability control (ASC) (also fuses 1, 17)
Heating (also fuses 9, 19, 20, 21)
Additional fuse
Air conditioning
Head restraints (also fuses 27, 40)
Heated seats (also fuses 5, 16, 27, 28, 40)
Instruments (also fuses 1, 12, 15, 17, 20, 33)
Electric seats (also fuses 18, 27, 40, 42, 43)
7.5 A
Relay K1
Starter system
Relay K2
Horn(s)
Relay K3
Discharge relay
Relay K4
Cooling fan
Relay K5
Washer pump
Relay K7
Parking lights
Relay K8
Heated windscreen
Relay K9
No information is available
Relay K10
ABS main relay (overvoltage protection)
Relay K16
Hazard warning lights
Relay K21
Additional cooling fan, stage 1
Relay K22
Additional cooling fan, stage 2
Relay K33
Air-conditioning compressor clutch relay
Relay K61
Discharge relay
N6
Headlight washer control unit
N17
Crash control unit
A3
Bulb check control unit
A4
Check control
fuse box diagram (1992).
Fuse 1
ABS
Stability control (ASC) (also fuse 17)
Instruments (also fuses 12, 17, 20, 29, 33)
Brake lights
Cruise control (also fuse 17)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
Engine management (also fuses 17, 20)
Headlights and fog lights (also fuses 3 – 5, 7, 8, 10, 11, 13, 14)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 4, 5, 20)
Number plate light(s)
Luggage compartment light(s) (also fuses 4, 5, 33)
Transmission EGS
Xenon lights (also fuses 2, 3, 10, 11, 28)
15.0 A
Fuse 2
Headlights and fog lights (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1, 3 – 5, 7, 8, 10, 11, 13, 14, 21)
Hazard warning lights
Direction indicators (also fuses 3, 6, 10, 11)
Light switch (also fuses 3 – 5)
Crash sensor (also fuses 6, 10, 11)
Xenon lights (also fuses 1, 3, 10, 11, 28)
7.5 A
Fuse 3
Body control unit (also fuses 4, 5, 15, 17, 30, 44, 47)
Headlight washers (also fuses 4, 5, 15, 17, 22, 44)
Headlights and fog lights (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 6, 10, 11)
Bulb check control unit (also fuses 1, 2, 4, 5, 7, 8, 10, 11, 13, 14)
Light switch (also fuses 4, 5)
Xenon lights (also fuses 1, 2, 10, 11, 28)
7.5 A
Fuse 4
Body control unit (also fuses 3, 5, 15, 17, 30, 44, 47)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 5, 20)
Headlight washers (also fuses 3, 5, 17, 22, 44)
Bulb check control unit (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Headlights and fog lights (also fuses 1 – 3, 5, 7, 8, 10, 11, 13, 14)
Number plate light(s)
Luggage compartment light(s) (also fuses 1, 5, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 5, 15, 18, 33)
Light switch (also fuses 2, 3, 5)
Mirror(s) (also fuses 5, 12, 30)
Interior lights (also fuses 5, 15, 17, 18)
7.5 A
Fuse 5
Body control unit (also fuses 3, 4, 15, 17, 30, 44, 47)
Headlight washers (also fuses 3, 4, 17, 22, 44)
Headlights and fog lights (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Parking light
Tail lights
Engine compartment light(s) (also fuses 1, 4, 20)
Number plate light(s)
Luggage compartment light (also fuses 1, 4, 33)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 15, 18, 26, 33)
Heated seats (also fuses 16, 27 – 29, 40)
Bulb check control unit (also fuses 1 – 4, 7, 8, 10, 11, 13, 14)
Interior lights (also fuses 4, 15, 17, 18, 30, 33, 44)
Mirror(s) (also fuses 4, 12, 30)
Light switch (also fuses 2 – 4)
10.0 A
Fuse 6
Hazard warning lights
Direction indicators (also fuses 2, 3, 10, 11)
Crash sensor (also fuses 2, 10, 11)
15.0 A
Fuse 7
Headlights
Fog lights (also fuses 1 – 5, 8, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 8, 10, 11, 13, 14)
15.0 A
Fuse 8
Headlights
Fog lights (also fuses 1 – 5, 7, 10, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 10, 11, 13, 14)
7.5 A
Fuse 9
Horn
Heating and air conditioning (also fuses 9, 19, 20, 21, 29)
Heated washer jets (also fuse 28)
15.0 A
Fuse 10
Headlights and fog lights (also fuses 1 – 5, 7, 8, 11, 13, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 11, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 11)
Crash sensor (also fuses 2, 6, 11)
7.5 A
Fuse 11
Headlights and fog lights (also fuses 1 – 5, 7, 8, 10, 13, 14)
Hazard warning lights
Direction indicators (also fuses 2, 3, 6, 10)
Crash sensor (also fuses 2, 6, 10)
Bulb check control unit (also fuses 2 – 5, 7, 8, 10, 11, 13, 14)
7.5 A
Fuse 12
Mirrors (also fuses 4, 5, 30)
Reversing light(s)
Seat and mirror memory (also fuses 16, 18, 30, 42)
Instruments (also fuses 1, 15, 17, 20, 29, 33)
Electronic damping control (EDC)
Heating and air conditioning (also fuses 21, 45)
Parking distance control (also fuse 31)
On-board computer (also fuses 15, 17, 20)
15.0 A
Fuse 13
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 14)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 14)
7.5 A
Fuse 14
Headlights
Fog lights (also fuses 1 – 5, 7, 8, 10, 11, 13)
Bulb check control unit (also fuses 1 – 5, 7, 8, 10, 11, 13)
7.5 A
Fuse 15
Body control unit (also fuses 3 – 5, 17, 30, 44, 47)
Wash/wipe system (also fuse 44)
Wiper pressure control (also fuses 22, 44)
Auxiliary heater (also fuses 19 – 21, 51, 52)
On-board computer (also fuses 12, 17, 20)
Headlight washers (also fuses 3 – 5, 17, 22, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 18, 26, 33)
Interior lights (also fuses 4, 5, 17, 18, 30, 33, 44)
7.5 A
Fuse 16
Seat and mirror memory (also fuses 12, 18, 30, 42)
Heated seats (also fuses 5, 27 – 29, 40)
Electric seats (also fuses 29, 40, 42, 43)
Steering column adjustment (also fuses 18, 48)
30.0 A
Fuse 17
Body control unit (also fuses 3 – 5, 15, 30, 44, 47)
Engine management
Starter motor
Alternator
Electronics box (E-box) cooling fan (also fuse 28)
Transmission AEGS
ABS (also fuses 1, 29)
Stability control (ASC)
Windows and sliding roof (also fuses 20, 30, 31, 47)
Body control unit (also fuses 30, 44, 47)
Check control (also fuses 1, 12, 20, 29, 33)
Interior lights (also fuses 5, 30, 33, 44)
Cruise control (also fuse 1)
Security system (also fuses 18, 20, 31, 51)
On-board computer (also fuses 15, 20)
Remote control (also fuses 18, 31, 51)
Headlight washers (also fuses 3 – 5, 15, 22, 44)
Interior lights (also fuses 4, 5, 15, 18, 30, 33, 44)
Heated door locks (also fuse 30)
Security system (also fuses 20, 31, 51)
7.5 A
Fuse 18
Audio system (also fuse 41)
Telephone
Remote control (also fuses 17, 31, 51)
Seat and mirror memory
Trailer control unit (also fuses 22, 50)
Interior lights (also fuses 4, 5, 15, 17, 30, 33, 42)
Seats (also fuses 27, 29, 40, 42, 43)
Sunshade (also fuse 32)
Steering column adjustment (also fuses 16, 48)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 26, 33)
15.0 A
Fuse 19
Heating
Auxiliary heater
Air conditioning
30.0 A
Fuse 20
Engine management (also fuses 1, 17)
Instruments (also fuses 1, 12, 17, 29, 33)
Clock
Air conditioning (also fuses 9, 19, 21, 29)
On-board computer (also fuses 15, 17)
Parking lights
Tail lights
Engine compartment light(s) (also fuses 1, 4, 5)
Security system (also fuses 17, 18, 31, 51)
Central locking (also fuses 30, 31, 47)
Windows and sliding roof (also fuses 17, 30, 31, 44)
Heating
Auxiliary heater
Security system (also fuses 17, 31, 51)
7.5 A
Fuse 21
Heating
Auxiliary heater
Air conditioning
7.5 A
Fuse 22
Trailer control unit (also fuses 18, 50)
Wiper pressure control (also fuses 15, 44)
Headlight washers (also fuses 3 – 5, 15, 17, 44)
30.0 A
Fuse 23
Engine management
15.0 A
Fuse 24
Engine management
15.0 A
Fuse 25
Additional cooling fan (also fuse 29)
30.0 A
Fuse 26
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 18, 33)
30.0 A
Fuse 27
Heated seats (also fuses 5, 16, 28, 29, 40)
Head restraints (also fuses 29, 40)
Electric seats (also fuses 29, 41, 43, 44)
30.0 A
Fuse 28
Engine management
Alternator (also fuse 17)
Electronics box (E-box) cooling fan (also fuse 17)
Power steering
Heated seats (also fuses 16, 27 – 29, 40, 42)
Telephone
Auxiliary heater (also fuses 15, 19 – 21)
Xenon lights (also fuses 1 – 3, 10, 11)
15.0 A
Fuse 29
Stability control (ASC) (also fuses 1, 17)
Heating (also fuses 9, 19, 20, 21)
Additional fuse
Air conditioning
Head restraints (also fuses 27, 40)
Heated seats (also fuses 5, 16, 27, 28, 40)
Instruments (also fuses 1, 12, 17, 20, 33)
Electric seats (also fuses 18, 27, 40, 42, 43)
Heated washer jets (also fuse 9)
7.5 A
Relay K1
Starter system
Relay K2
Horn(s)
Relay K3
Discharge relay
Relay K4
Cooling fan
Relay K5
Washer pump
Relay K8
Heated windscreen
Relay K9
No information is available
Relay K10
ABS main relay (overvoltage protection)
Relay K16
Hazard warning lights
Relay K21
Additional cooling fan, stage 1
Relay K22
Additional cooling fan, stage 2
Relay K33
Air-conditioning compressor clutch relay
Relay K61
Discharge relay
N6
Headlight washer control unit
N17
Crash control unit
A3
Bulb check control unit
A4
Check control
Fuse and relay box under the rear seat (first aid box).
To take in out, raise the locking catch behind the recessed handle and pull the first aid box forward.
fuse box diagram (1987-1988).
legend.
Fuse 30
Mirrors (also fuses 12, 16 – 18, 42, 44)
Central locking (also fuses 20, 31)
Heated door locks (also fuse 17)
Windows (also fuses 17, 20, 31, 44)
Sliding roof (also fuses 17, 20, 31, 44)
Body control unit (also fuses 17, 44, 47)
Interior lights (also fuses 5, 17, 33, 44)
Seat memory (also fuses 16 – 18, 42, 44)
7.5 A
Fuse 31
Central locking (ZKE) (also fuses 20, 30)
Security system
Remote control
Windows (also fuses 17, 20, 30, 44)
Sliding roof (also fuses 17, 30, 44)
7.5 A
Fuse 32
No information is available
Fuse 33
No information is available
Fuse 40
Heated seats
30.0 A
Fuse 41
Audio system (also fuse 18)
30.0 A
Fuse 42
Seats
Seat and mirror memory
30.0 A
Fuse 43
Seats
30.0 A
Fuse 44
Body control unit (also fuses 17, 30, 47)
Wiper system (also fuse 15)
Wiper pressure control (also fuse 22)
Headlight washers (also fuses 3 – 5, 17, 22)
Interior lights (also fuses 5, 17, 30, 33)
Seat and mirror memory
Windows
Sliding roof (also fuses 17, 20, 30, 31)
30.0 A
Fuse 45
Not used
30.0 A
Fuse 46
Heated rear windscreen (also fuses 21, 29)
30.0 A
Fuse 47
Body control unit (also fuses 17, 30, 44)
30.0 A
Fuse 51
Auxiliary heater
15.0 A
Fuse 52
Auxiliary heater
7.5 A
Fuse 53
Telephone (also fuse 18)
10.0 A
Fuse 54
No information is available
Relay K11
Wiper system
Relay K12
Wiper pressure control
Relay K13
Heated rear windscreen
Relay K15
Safety relay
Relay K17
Heated rear seats
Relay K20
Thermoswitch relay
Relay K27
Rear left seat
Relay K28
Rear right seat
A1
No information is available
A5
Relay module
A9
No information is available
A13
Control unit, rear head restraints
N13
Remote control unit
U3
No information is available
fuse box diagram (1989-1990).
legend.
Fuse 30
Mirrors (also fuses 4, 5, 12)
Central locking (also fuses 20, 31, 47)
Heated door locks (also fuse 17)
Windows (also fuses 17, 20, 31, 47)
Sliding roof (also fuses 17, 20, 31, 47)
Body control unit (also fuses 3 – 5, 15, 17, 44, 47)
Interior lights (also fuses 4, 5, 15, 17, 18, 33, 44)
Seat and mirror memory (also fuses 12, 16, 18, 42, 44)
7.5 A
Fuse 31
Central locking (also fuses 20, 30, 47)
Security system
Remote control
Windows (also fuses 17, 18)
Sliding roof (also fuses 17, 20, 30, 47)
Windows (also fuses 17, 20, 30, 47)
7.5 A
Fuse 32
Sunshade (also fuse 18)
30.0 A
Fuse 33
Instruments (also fuses 1, 12, 15, 17, 20, 29)
Number plate light(s)
Luggage compartment light (also fuses 1, 4, 5)
Interior lights (also fuses 4, 5, 15, 17, 18, 30, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 26)
30.0 A
Fuse 40
Seats
30.0 A
Fuse 41
Audio system (also fuse 18)
30.0 A
Fuse 42
Seats
Seat and mirror memory
30.0 A
Fuse 43
Seats
30.0 A
Fuse 44
Body control unit (also fuses 3 – 5, 15, 17, 30, 47)
Wiper system (also fuse 15)
Wiper pressure control (also fuses 15, 22)
Headlight washers (also fuses 3 – 5, 15, 17, 22)
Interior lights (also fuses 4, 5, 17, 18, 30, 33)
30.0 A
Fuse 45
Heating and air conditioning
30.0 A
Fuse 46
Heated rear windscreen
30.0 A
Fuse 47
Body control unit (also fuses 3 – 5, 15, 17, 30, 44)
Windows
Sliding roof (also fuses 17, 20, 30, 31)
Central locking (also fuses 20, 30, 31)
30.0 A
Fuse 50
Trailer (also fuses 18, 22)
30.0 A
Fuse 51
Security system (also fuses 17, 18, 20, 31)
Remote control (also fuses 17, 18, 31)
7.5 A
Fuse 52
No information is available
Relay K11
Wiper system
Relay K12
Wiper pressure control
Relay K13
Heated rear windscreen
Relay K15
Safety relay
Relay K17
Heated rear seats
Relay K20
Thermoswitch relay
Relay K27
Rear left seat
Relay K28
Rear right seat
A1
No information is available
A5
Relay module
A9
No information is available
A13
Control unit, rear head restraints
N13
Remote control unit
U3
No information is available
fuse box diagram (1991).
legend.
Fuse 30
Mirrors (also fuses 4, 5, 12)
Central locking (also fuses 20, 31, 47)
Heated door locks (also fuse 17)
Windows (also fuses 17, 20, 31, 47)
Sliding roof (also fuses 17, 20, 31, 47)
Body control unit (also fuses 3 – 5, 15, 17, 44, 47)
Interior lights (also fuses 4, 5, 15, 17, 18, 33, 44)
Seat and mirror memory (also fuses 12, 16, 18, 42, 44)
7.5 A
Fuse 31
Central locking (also fuses 20, 30, 47)
Security system
Remote control
Windows (also fuses 17, 18)
Sliding roof (also fuses 17, 20, 30, 47)
Windows (also fuses 17, 20, 30, 47)
7.5 A
Fuse 32
Sunshade (also fuse 18)
30.0 A
Fuse 33
Instruments (also fuses 1, 12, 15, 17, 20, 29)
Number plate light(s)
Luggage compartment light (also fuses 1, 4, 5)
Interior lights (also fuses 4, 5, 15, 17, 18, 30, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 26)
15.0 A
Fuse 40
Seats
30.0 A
Fuse 41
Audio system (also fuse 18)
30.0 A
Fuse 42
Seats
Seat and mirror memory
30.0 A
Fuse 43
Seats
30.0 A
Fuse 44
Body control unit (also fuses 3 – 5, 15, 17, 30, 47)
Wiper system (also fuse 15)
Wiper pressure control (also fuses 15, 22)
Headlight washers (also fuses 3 – 5, 15, 17, 22)
Interior lights (also fuses 4, 5, 17, 18, 30, 33)
30.0 A
Fuse 45
Heating and air conditioning
Electronic damping control (EDC)
30.0 A
Fuse 46
Heated rear windscreen
30.0 A
Fuse 47
Body control unit (also fuses 3 – 5, 15, 17, 30, 44)
Windows
Sliding roof (also fuses 17, 20, 30, 31)
Central locking (also fuses 20, 30, 31)
30.0 A
Fuse 50
Trailer (also fuses 18, 22)
30.0 A
Fuse 51
Security system (also fuses 17, 18, 20, 31)
Remote control (also fuses 17, 18, 31)
7.5 A
Fuse 52
No information is available
15.0 A
Relay K11
Wiper system
Relay K12
Wiper pressure control
Relay K13
Heated rear windscreen
Relay K15
Safety relay
Relay K17
Heated rear seats
Relay K20
Thermoswitch relay
Relay K27
Rear left seat
Relay K28
Rear right seat
A1
No information is available
A5
Relay module
A9
No information is available
A13
Control unit, rear head restraints
N13
Remote control unit
U3
No information is available
fuse box diagram (1992).
legend.
Fuse 30
Mirrors (also fuses 4, 5, 12)
Central locking (also fuses 20, 31, 47)
Heated door locks (also fuse 17)
Windows (also fuses 17, 20, 31, 47)
Sliding roof (also fuses 17, 20, 31, 47)
Body control unit (also fuses 3 – 5, 15, 17, 44, 47)
Interior lights (also fuses 4, 5, 15, 17, 18, 33, 44)
Seat and mirror memory (also fuses 12, 16, 18, 42, 44)
7.5 A
Fuse 31
Central locking (also fuses 20, 30, 47)
Security system
Remote control
Windows (also fuses 17, 18)
Sliding roof (also fuses 17, 20, 30, 47)
Windows (also fuses 17, 20, 30, 47)
Parking distance control
7.5 A
Fuse 32
Sunshade (also fuse 18)
15.0 A
Fuse 33
Instruments (also fuses 1, 12, 15, 17, 20, 29)
Number plate light(s)
Luggage compartment light (also fuses 1, 4, 5)
Interior lights (also fuses 4, 5, 15, 17, 18, 30, 44)
Glovebox light
Cigarette lighter
Accessory socket (also fuses 4, 5, 15, 26)
15.0 A
Fuse 40
Seats
30.0 A
Fuse 41
Audio system (also fuse 18)
30.0 A
Fuse 42
Seats
Seat and mirror memory
30.0 A
Fuse 43
Seats
30.0 A
Fuse 44
Body control unit (also fuses 3 – 5, 15, 17, 30, 47)
Wiper system (also fuse 15)
Wiper pressure control (also fuses 15, 22)
Headlight washers (also fuses 3 – 5, 15, 17, 22)
Interior lights (also fuses 4, 5, 17, 18, 30, 33)
30.0 A
Fuse 45
Heating and air conditioning
Electronic damping control (EDC)
Wash/wipe system
30.0 A
Fuse 46
Heated rear windscreen
30.0 A
Fuse 47
Body control unit (also fuses 3 – 5, 15, 17, 30, 44)
Windows
Sliding roof (also fuses 17, 20, 30, 31)
Central locking (also fuses 20, 30, 31)
30.0 A
Fuse 48
Body control unit (also fuse 30)
Steering column adjustment
Central locking (also fuses 30, 31)
Sliding roof (also fuses 30, 31)
15.0 A
Fuse 49
Telephone
10.0 A
Fuse 50
Trailer (also fuses 18, 22)
30.0 A
Fuse 51
Security system (also fuses 17, 18, 20, 31)
Remote control (also fuses 17, 18, 31)
7.5 A
Relay K11
Wiper system
Relay K12
Wiper pressure control
Relay K13
Heated rear windscreen
Relay K15
Safety relay
Relay K17
Heated rear seats
Relay K26
Rear right seat
Relay K27
Rear left seat
A1
No information is available
A5
Relay module
A13
Control unit, rear head restraints
N13
Remote control unit