Heater Controls

Heater Controls

Heater Control Module (J65) without A/C system

A/C control module (J301) with manual A/C

• The Heater Control Module (J65) - A - ( A/C Control Module (J301) ) is available in different versions (with and without Driver' Heated Seat Adjuster (E94) and Front Passenger Heated Seat Adjuster (E95) - C -, with different surfaces and rotary switches). Refer to Electronic Parts Catalog (ETKA).






• Only A/C control modules (J301) with part number 8P0 820 047, starting with index letter D may be installed in a vehicle with a manually controlled A/C system. Refer to Electronic Parts Catalog (ETKA).

• Heater controls (A/C system controls) consist of Heater Control Module (J65) - A - ( A/C Control Module (J301) ) and a base plate - B -.

• The base plate - B - is different between vehicles without A/C (with a control for Bowden cable to temperature door) and with manual A/C (without a Bowden cable control, the temperature door is moved by a control motor). Refer to Electronic Parts Catalog (ETKA). Since there is no Bowden cable to the temperature door present on vehicles with manual climate control system, the temperature control rotary switch can be twisted somewhat more easily than the air distribution rotary switch.

• A step-up gear for operating the flexible shaft (for air distribution) is installed in base plate - B -. The flexible shaft rotates 2 times for one switch rotation via the step-up gear on heater / on heating & A/C unit and on base plate of heater / A/C system controls. Refer to => [ Base Plate for Heater and A/C System Controls ] Base Plate For Heater and A/C System Controls.

• The heater control module- A - does not have a DTC memory (Guided Fault Finding is not possible) and are not connected to the CAN-Bus system.






• The A/C control module (J301) - A - does have a DTC memory (Guided Fault Finding is possible) and is connected to the Data bus. Refer to Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".






• Both rotary switches - A - and - B - in certain versions have only be inserted and can be pulled off. Only if they can be pulled off can they be replaced individually. Refer to Electronic Parts Catalog (ETKA).






• If both rotary switches - A - and - B - are fixed on (and cannot be pulled off), individual components of Heater Control Module (J65) (of A/C Control Module (J301) ) as well as lamps (LEDs = Light Emitting Diodes) for illuminating buttons and rotary switches cannot be replaced individually.

• Illumination of rotary switches and buttons of heater controls (A/C system controls) occurs via terminals 58s and 58d. On vehicles without A/C system, these two terminals are connected directly to Heater Control Module (J65). On vehicles with a manual A/C, the switch condition and the voltage of both terminals is checked by the databus system from the A/C control module (J301). Refer to Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".

• Function indicator lamp in fresh/recirculating air button - F - of heater controls is supplied with voltage via terminals 58d.






• Heater control module functions, refer to=> [ Heater Control Module Functions ] Heater Control Module Functions.