Fault Code 0409

Fault code 0409

Signal of emergency button knob is constantly present






NOTE: This fault occurs if the emergency button is pressed longer than 40 seconds.

Diagnostic conditions
- Ignition on
- Panorama roof system (PDS) control unit, internal function test

Possible cause of fault
- Signal of emergency button is on longer than 40 seconds
- Short circuit in signal wire
- Switch sticks or is faulty

Affected pins
Panorama roof system (PDS) control unit plug D 'operating switches and sun blind':
Pin 1 'Emergency button'
Pin 10 'GND'

Knob 6-pin plug:
Pin 2 'GND'
Pin 5 'Emergency button'

Diagnosis/troubleshooting

NOTE: After repair, replacement of components of the Panorama roof system, or open circuit of the battery, the limit positions must be relearned for the Panorama roof system control unit.