Initial Inspection and Diagnostic Overview

Workshop Hints

SHD Self Diagnosis
The SHD monitors operation and stores fault codes if a defect is determined. The SHD monitors the following conditions:
- SHD motor relays: The relays are checked for sticking contacts (plausibility) and non functional contacts.
- Hall effect position sensors: The SHD must detect a pulse frequency from the hall effect sensor(s) during operation.
- Sunroof Switch: The SHD monitors the signal plausibility of the coded signaling from the sunroof switch.

Sunroof Fault Response Characteristics
If a fault occurs with any of these functions, the SHD responds as follows:
- Overrides the end run detection.
- Switches the motor off if the relay contacts stick for more than 500 ms.
- Switches the motor off if pulses are not received.

Emergency Operation of the Sunroof




If the sunroof motor does not respond to the switch signals, the hex key in the trunk lid tool kit is used to manually turn the motor shaft drive.