Workshop Hints: Notes

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 nonfunctional 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.