Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, compass ON, verify that there is a compass reading on the display.
- If the display is blank, replace the ISRVM.
- If the display shows the letter C or CAL, perform the compass calibration procedure. Refer to Compass Calibration and Magnetic Variance .
Verify that the compass reading on the display is correct.
- If not correct, perform the compass magnetic variation adjustment procedure. Refer to Compass Calibration and Magnetic Variance .
If the display is still incorrect, replace the ISRVM.