Diagnostic Instructions
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 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.
Reference Information
Schematic Reference
Inside Rearview Mirror Schematics
Connector End View Reference
Mirror Connector End Views
Electrical Information Reference
Circuit/System Testing
- Ignition ON, compass ON, verify that there is a compass reading on the display.
⇒ | If the display is blank, replace the ISRVM. |
- Verify that the compass reading on the display is correct.
- If the display is still incorrect, replace the ISRVM.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.