Distribution Terminal +15

Distribution Terminal +15:

Operation
The positive supply is taken from battery 1 to ignition switch 20, across distribution block 75 and 29-pole white connector 152A in the electrical distribution box.

When the ignition switch is in the drive or start position, the + 15 supply will be taken from terminal 15 of the ignition switch to the following components:

- Light switch 10, across 12-pole connector 58
- Fuses 3 and 22 in fuse holder 22A
- Timing service instrument socket 73
- Control unit 306 for the passive seat belts, across 3-pole connector 57 (1989 cars for the USA market).

The following components are then supplied from fuse 3. Some of the components are included only on certain car variants.

5 Ignition coil

146 Amplifier for the electronic ignition system

176 Control unit for the EZK ignition system

320 Ignition coil with integrated amplifier (1989 model)

390 Modulating valve, LH 2.4 Lambda (1990 model: UC)

The following components are then supplied from fuse 22, across distribution terminal 159. Some of the components are included only on cars for certain markets, on cars with 8 or i6 valve engines, etc.

- Time-delay relay 26 for the radiator fan (1989 model)
- One half of the combined instrument 47 across the red 29-pole connector 152B in the electrical distribution box
- Relay 156 for the AC compressor
- Time-delay relay 113 for the electrically heated rear window
- Carburettor float chamber valve 114
- Carburettor fuel shut-off valve 140
- Control unit 200 for the LH fuel system (6-pole connector 67 in the engine compartment, to the right beside the air intake)
- Fuel pump relay 102 (I8, 1989 T8). On turbo-charged cars, the relay is connected across boost pressure switch 144.

Fault-tracing hints
1. Check the battery voltage.
2. Check the terminals of distribution block 75 and 29-pole connectors 152.
3. Set the ignition switch to the drive position and check that the supply from fuse 22 is live.
4. Check the relevant wiring.