Description of On-Board Diagnostic System

Notes on the BMW DIAGNOSTIC SYSTEM:

Diagnostic mode via I-bus (instrument bus):

Defect Code Memory:

A large number of defects are detected automatically by the general module and stored in the defect code memory. The stored defect codes are retained also after disconnecting the battery or removing the module. The defects are displayed arranged in the order of the time they first occurred.

Test Procedure:

A separate diagnostic procedure has been compiled for each part-system of the ZKE, thus enabling guided troubleshooting.

Diagnosis via I-Bus:

The general module (GM) has no direct diagnostic bus connection. The general module (GM) is linked via the instrument bus (I-bus) to the electronic body module (EKM). The total data traffic is handled via this link (for more detailed description of the I-bus, refer to Instrument Cluster EKM)

Troubleshooting:

Notes:

- Troubleshooting with BMW DIAGNOSTIC SYSTEM
- Battery charged, U-min = 12V
- The power supply to the general module, sunroof module and door modules is interrupted when the relay module is removed.
- Only remove and install the above mentioned modules with the ignition switched off. After reinstallation, clear defect code memory with *D* defect code memory.
- Windscreen wiper control defective
- Power windows defective
- Sunroof defective
- Central locking system defective
- Door lock heating defective
- Headlamp washer defective
- Wiper pressure control defective
- Interior light control defective