Additional Heating

Fault code 1320

Air-conditioning system regulator control module

Diagnostic conditions
- Ignition on
- Internal auxiliary heater control unit function test

Possible cause of fault
Communication problem with all control modules via CAN Infotainment.
- CAN Infotainment is faulty
- No signal/communication

Affected pins
Plug A for auxiliary heater control unit
- Pin 2 'CAN Infotainment (high)'
- Pin 3 'CAN Infotainment (low)'

Diagnosis/troubleshooting

NOTE: If there is no in coming signal/message via the CAN Infotainment using several control modules, the CAN Infotainment must be checked for open or short circuits. Refer to 'Checking instructions/CAN data bus'.