DTC 91

091

External Interference Voltage.







Fault symptom
Parking heater fails to start.

Condition
Parking heater activated.
Parking heater control module adversely affected by unwanted currents in vehicle wiring.

Diagnostic help
Parking heater can be activated with Tech 2.
Parking heater function can be programmed in SID.
Eberspacher diagnostics instrument used for diagnosis.