B0438

Read the instructions below then start the fault diagnostic procedure.

Symptom: Poor heating of cabin Heater stops if running Heater does not start

B0438

Fault symptoms

Poor heating of cabin

Heater stops if running

Heater does not start

Conditions

Heater running.

The resistance of the glow plug circuit is less than 30 mOhm for 100 ms.

Diagnostic help

The output from the control module can be activated using the diagnostic tool.

The heater has an extra cable and connector that is separate from the ordinary wiring on the heater. This cable and connector are not used but are connected to the control module. Therefore, check that this cable is undamaged before starting fault diagnosis.

The ordinary wiring between the heater and the 8-pin connector contains an additional light-green wire that is cut and not used.