Description of On-Board Diagnostic System

Notes on the BMW DIAGNOSTIC SYSTEM:

The input GM-D8 (switch position intensive wash) is not included in the diagnostic procedure.

The wash pump can only be activated when an intensive wash function is installed.

The general module (GM) detects no statuses in the vehicle during simulation of inputs or outputs. As a result, the wiper does not return to the park position and intermittent mode operates uncontrolled.

The component concerned is stored as defective during simulation. The ZKE defect code memory is therefore cleared automatically during each simulation.

Redetection of a cleared defect code:
a) Automatically if defect still exists (e.g. anti-blocking function active)
b) All wiper stages switched through with wiper/washer switch.

The following defects can be detected and stored by the defect code memory:

1. Ground applied at both GM-D4 and GM-D5 (stage 1 and intermittent wipe function activated at same time).

2. Wiper switched off by anti-blocking function.

3. Relay in relay module defective.


Troubleshooting:

Notes:

- Troubleshooting with BMW DIAGNOSTIC SYSTEM
- Battery charged, U-min = 12 V
- If all central body electronics (ZKE) functions have failed (central locking system, power windows, windscreen wiper pressure control and windscreen wiper and washer system), carry out troubleshooting in accordance with Central Body Electronics (ZKE).

Important!

After applying the supply voltage (terminal 30 at Pin Al), the ZKE general module detects which part systems are installed in the vehicle. Undefined contacting when plugging in the module result in systems not being detected. Therefore:

Disconnect vehicle battery before installing a ZKE general module!

or

Disconnect vehicle battery for at least 5 seconds after installing a ZKE general module.

Also refer to Central Body Electronics (ZKE), Functional Description.
Description and Operation