A/C Control and Regulation Components Inside Passenger Compartment

A/C Control and Regulation Components Inside Passenger Compartment

• If there is a malfunction in the system, first check the Climatronic Control Module (J255) front A/C control head DTC memory and the Rear A/C Display Control Head (Climatronic) (E265)) Vehicle diagnosis, testing and information system VAS 5051 in "Guided Fault Finding" function.

• If no fault is displayed, check the measured value block for the Climatronic Control Module (J255) A/C control head and the Rear A/C Control Head (Climatronic) (E265)) and activate the affected component with the "Output diagnostic test mode" function Vehicle diagnosis, testing and information system VAS 5051 in "Guided Fault Finding" function.

• Repair work on refrigerant circuit. Refer to => [ Servicing Refrigerant Circuit ] Servicing Refrigerant Circuit.

• Perform the following work after complete repairs Vehicle diagnosis, testing and information system VAS 5051 in "Guided Fault Finding" function:

- Check DTC memory of front A/C control head Climatronic Control Module (J255) and of Rear A/C Control Head (Climatronic) (E265) and erase DTCs displayed if necessary.

- Check coding of A/C control head Climatronic Control Module (J255)

- If necessary, check adaptation of front A/C control head Climatronic Control Module (J255) and Rear A/C Control Head (Climatronic) (E265) (not installed on all vehicles).

- Perform air conditioner basic setting.

• The electrical test for various actuators, potentiometers and sensors is described in Guided Fault Finding Vehicle diagnosis, testing and information system VAS 5051 in "Guided Fault Finding" function.