Diagnostic Aids
WARNING: This page is about a different car, the 2007 Hummer H2. 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 EFS signal and voltage circuits
- High or low resistance in the EFS signal and voltage circuits
- Inspect the EFS signal and voltage circuits carefully for cutting and/or chafing
- Verify that the correct EFS is installed in the vehicle