Defect Code 28

Defect Code 28:

*D* Defect Code Memory: ADV module defective:

Explanation: This defect code is stored when the general module (GM) detects a defect in activation via the diagnostic link from the ADV module.

Possible causes:
- Wires
- Voltage supply K12 ADV module
- K12 ADV module
- Relay module

Troubleshooting: As displayed on screen