A/C System Control and Regulation Components Inside Passenger Compartment

A/C System Control and Regulation Components Inside Passenger Compartment

• Vehicles with automatically regulated A/C system: the Climatronic Control Module (J255) evaluates the signals from various components and actuates the compressor via the A/C Compressor Regulator Valve (N280).

• Vehicles with manual climate control system: the A/C control module (J301) evaluates the signals from various components and actuates the A/C compressor via the A/C compressor regulator valve.

• If there is a malfunction in the system, first check DTC memory of Climatronic control module / A/C Control Module using Vehicle diagnosis, testing and information system (VAS5051B) in "Guided Fault Finding."

• If no fault is displayed, then read the measured value block for the Climatronic control module / the A/C control module and test the component using the control diagnosis function of the Vehicle diagnosis, testing and information system (VAS5051B).

• Servicing operations on refrigerant circuit are described in => [ Refrigerant Circuit Repairs ] Refrigerant Circuit Repairs.

• Perform the following work after completion of repair operations:

- Check DTC memory of the Climatronic Control Module (J255) / A/C Control Module (J301) and erase any malfunctions displayed.

- Check coding of Climatronic control module.

- If necessary, check adaptation of Climatronic control module.

- Perform A/C system basic setting using Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".

• The electrical tests for various motors, potentiometers and sensors are described in Guided Fault Finding using Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".

Components inside passenger compartment, refer to => [ A/C System Control and Regulation Components Inside Passenger Compartment ] A/C System Control and Regulation Components Inside Passenger Compartment.