For 1990-2009 cars only
Compass Malfunction Mirror
Diagnostic Instructions
| • | 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. |
Circuit/System Description
The inside rearview mirror (ISRVM) uses 2 magnetic field sensors for compass direction. One sensor is for north and south, the other sensor is for east and west. 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.
Reference Information
Schematic Reference
Inside Rearview Mirror Schematics
Connector End View Reference
Description and Operation
Driver Information Center (DIC) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, compass ON, verify that there is a compass reading on the display.
- Verify that the compass reading on the display is correct.
- If the display is still incorrect, replace the ISRVM.
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification
Control Module References for ISRVM replacement, setup and programming
