Heater starts. No heat in cabin.

Symptom: No heat in cabin.

Heater starts. No heat in cabin.

Fault symptom

No heat in cabin.

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 wiring

•	Remove the ACC/MCC panel.

•	Connect test lamp 86 11 857 to pin 3 of the ACC/MCC and a good grounding point.

•	Contact: SID.

•	Activate parking heater (ON).

•	The lamp should come on.

Test results OK?

YES

-	See the ACC/MCC service manual for further fault diagnosis procedures.

-	Go to point 2.

NO

-	Connect the Eberspächer diagnostics instrument.

-	Activate the Eberspächer diagnostics instrument (D).

-	Make a note of all diagnostic trouble codes.

-	Deal with the diagnostic trouble codes generated as described in the diagnostic procedure for each of them.

-	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’.