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Ventilation fan and rear window heater cannot be started before 20 s after ignition on

Read the instructions below then start the fault diagnostic procedure.

Symptom: Ventilation fan and rear window heater cannot be started before 20 s after ignition on.

Ventilation fan and rear window heater cannot be started before 20 s after ignition on






Fault symptom

Ventilation fan and rear window heater cannot be started before 20 s after ignition on.

Diagnostic help

Ignition +54 can be checked in DICE using the diagnostics tool.

If +54 is absent when +15 is present, bus message Ignition +54 ON after 20 seconds will be set.

ACC uses bus message Ignition +54 in order to cut out the ventilation fan when the engine is being started.