Diagnostic Aids
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Because of the accessibility of the sunroof switch, perform the sunroof switch component test before beginning the Circuit/System Testing.
- If the sunroof and/or sunshade are experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open condition. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the switch illumination circuit. When the lights are turned ON, the redundant path is removed, and the sunroof and/or sunshade will become inoperative.
- If voltage is not measured on the sunroof switch open signal or sunroof switch close signal circuits, the fault could be in the RAP relay switch supply voltage circuit, battery positive voltage circuit, or the control module ground circuit. If the control module is not being powered, neither will the switch signal circuits.