Rear/Door Convenience System

Fault Code 1320

Air-conditioning system regulator control unit

NOTE: This fault was detected by the 'rear convenience system' control unit.

Diagnostic conditions

- Ignition on
- Battery voltage OK (11.4 to 14.5 V)
- Internal rear convenience system control unit function test

Possible causes of fault

- No signal/communication (no signal from air-conditioning system regulator control unit on CAN comfort)

Affected pins

Rear convenience system control unit: Plug B
- Pin 2 'CAN high (CAN comfort high)'
- Pin 8 'CAN low (CAN comfort low)'

Diagnosis/troubleshooting

NOTE:
- Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear convenience system control unit plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and proper contact. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.
- Sporadic faults: In the event of faults that occur sporadically, the wiring positions that are linked to moving parts on and in the vehicle must be checked for each system. Various statuses that can cause faults must be simulated with the help of the wiring diagram.
- Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.
- An interruption to CAN comfort can only occur if the fault '1330 rear convenience system control unit' is present in the air-conditioning system regulator control unit.