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.
Parking Heater
The driver seats the desired departure time using one of the two timer functions in the driver information module (DIM) (5/1) display. Time is set using the left control stalk.
If the engine has not been started since the last timer start of the heater, the combustion preheater module (CPM) (4/7) will not allow another start of the heater until the engine has been started.
The central electronic module (CEM) (4/56) receives information on desired departure time from the steering wheel module (SWM) (3/130) and driver information module (DIM).
Approximately 50 minutes before the desired departure time, the central electronic module (CEM) transmits information to the combustion preheater module (CPM) about:
- outside temperature
- quantity of fuel
- the operating status of the vehicle
- a request to calculate the start time of the heater.
The combustion preheater module (CPM) calculates start time based on information from the central electronic module (CEM) and starts the heater at the calculated time point. The heater calculates when to start (15-60 minutes before the planned departure at temperatures between -30 °C/-22 °F and +15 °C/59 °F).
The heater runs max. 60 minutes at temperatures below -10 °C/14 °F.
The heater runs a minimum of 15 minutes before the desired departure time. (Temperatures between +15 °C/59 °F and +25 °C/77 °F).
When the heater is started directly using the control stalk, it runs until it is shut off or for a maximum of 60 minutes. The coolant pump and blower fan remain activated for 2 minutes after the set departure time to allow for the driver getting to the car late.
A text message is displayed in the driver information module (DIM) when the heater is activated.
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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.