072

Symptom: Parking heater fails to start.

072

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 coolant temperature sensor 2

•	Lower the heater to gain access to the control module.

•	Remove the parking heater control module.

•	Unplug connector B2.

•	Take a resistance reading across pins 9 and 10 in female connector B2.

•	Value should be greater than 50 ohms.

Test results OK?

YES

-	Inspect the connector for corrosion.

-	Go to point 2.

NO

-	Change engine coolant temperature sensors 1 and 2.

-	Go to point 2.

2. Final check

•	Delete DTCs 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 ’Procedure for replacement of control module’.