Ignition Switch: Testing and Inspection

On Board Diagnostic, Function
The Access/Start Authorization Control Module is controlled by an internal microprocessor with On Board Diagnostic (OBD) capability. If malfunctions occur in monitored components, Diagnostic Trouble Codes (DTC) will be stored in
memory.

Troubleshoot automatic access/start authorization system malfunctions by performing OBD program. Use VAS 5051 Vehicle Diagnostic Testing and Information System in mode "Guided Fault Finding".
- Enter appropriate model, equipment and model year information and press ">" to confirm.

After the DTC memory of all control modules has been checked:
- Press "Go to" button
- Select "Function/Component Selection"
- Select: "Body (Repair Group 01; 27; 50 to 97)"
- Select: "Electrical System (Repair Group 01; 27; 90 to 97)"
- Select: "01 - Systems capable of self-diagnosis
- Select: "Immobilizer"
- Select: appropriate option
- Follow tester prompts