• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The inside rearview mirror (ISRVM) uses 2 magnetic field sensors for compass direction. One sensor is for north and south, the other is for east and west. The ISRVM supplies a signal and low reference to each sensor. As the vehicle travels with or against the earths magnetic pull, there will be a change in voltage on one or both sensors. As a result of the change in voltage, the ISRVM changes the heading on the compass display. The internal fault detection for the compass is handled by the ISRVM.
Automatic Day-Night Mirror Description and Operation
Control Module References for scan tool information
⇒ | 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. |
⇒ | If not correct, perform the compass magnetic variation adjustment procedure. Refer to Compass Calibration and Magnetic Variance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ISRVM replacement, setup, and programming