031

Symptom: Parking heater fails to start.

031

Fault symptom

Parking heater fails to start.

Condition

Parking heater activated.

Diagnostic help

Parking heater can be activated with Tech 2.

Parking heater function can be programmed in SID.

Eberspächer diagnostics instrument used for diagnosis.

Diagnostic procedure

1. Check combustion air fan motor

•	Remove the parking heater.

•	Remove the parking heater control module.

•	Unplug connector B2.

•	Check the fan motor leads.

Are the leads OK?

YES

-	Check connectors for corrosion.

-	Go to point 2.

NO

-	Change the fan motor.

-	Go to point 2.

2. Final check

•	Clear the diagnostic trouble codes in all systems.

•	Contact SID.

•	Activate parking heater (ON).

•	Perform a functionality check.

•	Evaluate the functionality check.

•	Check that the diagnostic trouble code has not recurred.

Test results OK?

YES

-	Fault rectified successfully.

NO

-	See ’Before changing a control module’.