Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The following can cause an intermittent condition:
- A short between the SIS signal and voltage circuits
- High or low resistance in the SIS signal and voltage circuits
- Inspect the SIS signal and voltage circuits carefully for cutting and/or chafing
- Verify that the correct SIS is installed in the vehicle
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.