Engine bay electrical centre 342 (UEC)
| Engine bay electrical centre 342 (UEC) |
| Location |
The electrical centre is located between the battery and the left front wing.
| Main task |
Act as the electrical centre for the front of the car and handle some parts of the logic for the front lighting as well as the visibility and signal systems.
Distributes current from the battery to the other electrical centres.
The electrical centre contains the transport fuse (fuse 37).
| Type |
Electrical centre with relays, maxi and micro-fuses and integrated control module for logic operations.
| Connect |
The fuse box is connected to the battery and to grounding points G30A, G30B and G33S. The electrical centre is connected via three switches in its base to the engine harness, front harness and main harness.
Power supply circuit for +30
Power supply circuit for +15
The engine harness is connected via switch M
M (engine harness)
| Pin | Component/Function | In/Out |
| 1 | P-Bus | |
| 2 | Not connected | |
| 3 | Not connected | |
| 4 | Radiator fan 3 | In |
| 5 | Radiator fan 2 | In |
| 6 | A/C compressor | |
| 7 | Not connected | |
| 8 | ECM | |
| 9 | Switch, reverse gear | |
| 10 | Radiator fan 1 | |
| 11 | Not connected | |
| 12 | Not connected | |
| 13 | Not connected | |
| 14 | Control module, glow plug | Out |
| 15 | Main relay | |
| 16 | Control module, glow plug | |
| 17 | Start relay | |
| 18 | Not connected | |
| 19 | Not connected | |
| 20 | Not connected | |
| 21 | ECM (starting control) | |
| 22 | TCM (starting control) | |
| 23 | ECM main relay | In |
| 24 | ECM | |
| 25 | TCM | |
| 26 | ECM (diesel A/C relay) | |
| 27 | Clutch switch | In |
| 28 | ECM (starting control) | |
| 29 | Not connected | |
| 30 | P-Bus |
The front harness is connected via switch F
F (front harness)
| Pin | Component/Function | In/Out |
| 1 | Parking light, right, front | Out |
| 2 | Direction indicator, right, front | Out |
| 3 | Direction indicator, left, front | |
| 4 | Side direction indicator, left, front | |
| 5 | Side marker lamp, right | |
| 6 | Side marker lamp, left | |
| 7 | Not connected | |
| 8 | Parking light, left, front | |
| 9 | Side direction indicator, right, front | |
| 10 | Fog light, right, front | |
| 11 | Wipers, front, park position | |
| 12 | Not connected | |
| 13 | Not connected | |
| 14 | Washer fluid, level sensor | |
| 15 | Not connected | |
| 16 | Dipped beam, right | |
| 17 | Main beam, left | |
| 18 | Parking heater | Out |
| 19 | Level control, headlamps | Out |
| 20 | Radiator fan, low-speed | Out |
| 21 | Main beam, right | |
| 22 | Pump, headlamp washer | |
| 23 | Not connected | |
| 24 | Radiator fan, high-speed | Out |
| 25 | Dipped beam, left | |
| 26 | Power ground | |
| 27 | Power ground | |
| 28 | Fuel filter, diesel | Out |
| 29 | Windscreen wiper motor, high-speed | |
| 30 | Windscreen wiper motor, low-speed | |
| 31 | Not connected | |
| 32 | Not connected | |
| 33 | Fog light, left, front | |
| 34 | Horn | |
| 35 | Auxiliary lamp | |
| 36 | Pump, windscreen washer | |
| 37 | I-bus | |
| 38 | Not connected | |
| 39 | Not connected | |
| 40 | Not connected | |
| 41 | Not connected | |
| 42 | Not connected | |
| 43 | Pump, rear window washer | |
| 44 | P-Bus | |
| 45 | P-Bus | |
| 46 | Not connected | |
| 47 | Radiator fan 3 | |
| 48 | Radiator fan 2 | |
| 49 | Radiator fan 1 | |
| 50 | I-bus |
The main harness is connected via switch B
B (main wiring harness)
| Pin | Component/Function | In/Out |
| 1 | +15 feed | Out |
| 2 | I-bus | |
| 3 | I-bus | |
| 4 | Clutch switch | |
| 5 | Battery disconnect | Out |
| 6 | P-Bus | |
| 7 | Not connected | |
| 8 | +30 supply 2 to REC | Out |
| 9 | +30 power supply to ABS/ESP | Out |
| 10 | Not connected | Out |
| 11 | +30 supply 2 to IPBEC | Out |
| 12 | +30 supply 3 to REC | Out |
| 13 | +30 supply 1 to IPBEC | Out |
| 14 | +30 supply amplifier for front speakers | Out |
| 15 | +30 supply 1 to REC | Out |
| 16 | +30 supply logic to ABS/ESP | Out |
| 17 | P-Bus | |
| 18 | Electronic ground | |
| 19 | Brake/clutch switch | |
| 20 | +15 supply to TCM/TRS | Out |
| 21 | I-bus | |
| 22 | I-bus |
| Fuses |
The electrical centre can contain a greater number of fuses than those listed below. In such cases, these are not connected to a wiring harness.
| No | Amp | Type | Function | Picture |
| 1 | 30 | +30 | PSG16 via main relay 229: Control module, PSG16 Glow plug control module Charge air control valve Solenoid valve, combustion circulation Solenoid valve, engine shut-off Simtec via main relay 229: Control module, Simtec Heated oxygen sensors Control valve, VIM damper EVAP canister purge valve |
|
| 2 | 10 | +30 | Trionic T8 TCM |
|
| 3 | 20 | +30 | Horn |
|
| 4 | 10 | +15 | T8: Control module, Trionic T8 Battery disconnect switch Simtec: Control module, Simtec Ignition coil unit Power steering unit PSG16: Control module, PSG16 Mass Air Flow Sensor, diesel EGR unit |
|
| 5 | -- | -- | ||
| 6 | 10 | +30 | TCM Gear selector, automatic Immobilizer switch |
|
| 7 | -- | |||
| 8 | 20 | +15 | Fuel filter, diesel |
|
| 9 | -- | |||
| 10 | -- | |||
| 11 | -- | |||
| 12 | -- | |||
| 13 | 10 | +30 | A/C compressor (PSG16 and Simtec) |
|
| 14 | -- | |||
| 15 | 30 | +30 | Washer fluid pump, headlamp |
|
| 16 | 30 | Lighting, left front: Side direction indicators, dipped beam, fog light Lighting, right front : Position lamp, direction indicator, side direction indicator, main beam |
|
|
| 17 | 30 | Windscreen wiper motor, low-speed |
|
|
| 18 | 30 | Windscreen wiper motor, high-speed |
|
|
| 19 | 20 | +30 | Parking heater Auxiliary heater Connection, accessories |
|
| 20 | 10 | +15 | Motors, manual headlamp beam adjustment Automatic Headlamp Levelling |
|
| 21 | -- | |||
| 22 | 30 | +30 | Washer fluid pump, windscreen |
|
| 23 | -- | |||
| 24 | 20 | +30 | Auxiliary lamp Solenoid, screen, xenon lamp (US/CA) |
|
| 25 | 20 | +30 | Front amplifier |
|
| 26 | 30 | +30 | Lighting, left front: direction indicator, position lamp, main beam Lighting, right front: dipped beam, fog light |
|
| 27 | 60 maxi | +30 | Glow plug control module |
|
| 28 | 40 maxi | +30 | TCS/ESP |
|
| 29 | 60 maxi | +30 | Main fuse 2 for rear electrical centre | |
| 30 | 60 maxi | +30 | Main fuse 2 for dashboard electrical centre | |
| 31 | 40 maxi | +30 | Starter motor solenoid via relay 517 |
|
| 32 | 60 maxi | +30 | Main fuse 1 for dashboard electrical centre | |
| 33 | 40 maxi | +30 | TCS/ESP |
|
| 34 | 60 maxi | +30 | Main fuse 1 for rear electrical centre | |
| 35 | 30 maxi | +30 | T8 and PSG16: Radiator fans, high speed Simtec: Radiator fan |
|
| 36 | 20 maxi | +30 | Radiator fans, low-speed |
|
| 37 | 60 maxi | +30 | Transport lock. Main fuse 3 for rear electrical centre |
| Relays |
The electrical centre can contain a greater number of relays than those listed below. In such cases, these are not connected to a wiring harness.
| Location | No | Description | Picture | Diagram |
| R1 | 432b | Relay, washer fluid pump, windscreen |
|
|
| R2 | 156 | Relay, A/C compressor (Simtec and PSG16) |
|
Simtec PSG16 |
| R3 | -- | |||
| R4 | -- | |||
| R5 | 666 675 | Relay, headlamp flasher (US/CA) Relay, auxiliary lamp (other markets) |
|
|
| R6 | 68 | Horn relay |
|
|
| R7 | 229 | Main relay, engine management system (Simtec and PSG16) |
|
Simtec PSG16 |
| R8 | 517 | Relay, +50 |
|
AUT petrol diesel |
| R9 | 83 | Windscreen wiper relay |
|
|
| R10 | -- | |||
| R11 | 757F | Relay, +15, UEC |
|
|
| R12 | 709 | Relay, windscreen wiper, full/half speed |
|
|
| R13 | -- | |||
| R14 | 667 | Relay, washer fluid pump, high-pressure, headlamp |
|
|
| R15 | -- | |||
| R16 | -- |
This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
Our Friends
