Ventilation fan and electrically heated rear window cannot start until 20 s after ignition on
Read the instructions below then start the fault diagnostic procedure.
Symptom: Electric rear window and ventilation fan cannot start until 20 seconds after the ignition has been turned to the ON position (+54 voltage).
Ventilation fan and electrically heated rear window cannot start until 20 s after ignition on |
Fault symptoms
Electric rear window and ventilation fan cannot start until 20 seconds after the ignition has been turned to the ON position (+54 voltage).Diagnostic help
Ignition +54 can be read in DICE using the diagnostic tool.If +54 is absent when +15 is present, the bus message Ignition +54 ON is generated after 20 s.
The ACC uses the bus message Ignition +54 to disengage the ventilation fan while the engine is being started.