Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heater And A/C System Controls
Heater controls, Heater Control Module -J65- on vehicles without A/C system
A/C system controls, A/C Control Module -J301- on vehicles with manually regulated A/C system
Heater Control Module (A/C Control Module) -A- is available in different versions (with and without heated seat adjusters (Driver Heated Seat Adjuster -E94- and Front Passenger Heated Seat Adjuster -E95- -C-).
From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. The heater control module has no affect on the Start/Stop function on vehicles with only a heater (no A/C). If the vehicles has a manual climate control system, then, depending on the setting on the A/C control module (for example, the heater is on) the Stop function will prevent the engine from being started again as soon as there is a request for heating. The A/C control module does not limit the Stop function when the cooling mode is on. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
If the vehicle has the Start/Stop System, there is no additional coolant pump. An electric coolant pump may be present depending on the vehicle engine, which is controlled by an Engine Control Module (ECM). Refer to [For engine(s) CBRA] AFTER-RUN COOLANT PUMP or refer to [For engine(s) BPY] AFTER-RUN COOLANT PUMP OVERVIEW or refer to [For engine(s) CCTA, CBFA] AFTER-RUN COOLANT PUMP -V51 and Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
If the vehicle has a Start/Stop System and a manual climate control system, then install A/C control module, part number 8P0 820 047, starting with index D.
The heater controls (heater control module) -A- do not have a DTC memory (Guided Fault Finding is not possible) and are not connected to the CAN-Bus system.
A/C system controls (A/C control module) -A- is equipped with DTC memory (Guided Fault Finding is possible) and connected to the CAN-Bus system, therefore check DTC memory if necessary before removing using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
Removing
-- Remove the radio or the radio/navigation system. Refer to Removal and Installation .
-- Pull off trim panel for heater controls -A- (A/C system controls).
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.