Compass: Description and Operation

Electronic Compass

Functional Components

The functional components of the compass system are:

- Auto-dimming interior mirror (vehicles without navigation)
- Global Positioning System (GPS) antenna (vehicles with navigation)
- Front Display Interface Module (FDIM)

Vehicles Without Navigation

The compass signal originates from the compass module, which is integrated into the auto-dimming interior mirror.

The compass display is incorporated into the FDIM.

The vehicle heading is displayed as a 1 or 2 character display located in the lower LH side of the FDIM and indicates the current direction of the vehicle (N, NE, E, SE, S, SW, W, or NW). The compass continuously re-calibrates due to changes in the magnetic field and remains accurate during most driving conditions.

The Front Controls Interface Module (FCIM) buttons that allow the driver to operate the calibration and zone setting procedures are located below the FDIM.

The compass display is on with the ignition key in the ON or START position. When the ignition key is first turned to the ON or START position, there is a momentary delay of approximately 6 seconds before the compass display illuminates. If the battery saver has been activated and the ignition is turned to ON or START, the momentary delay before the compass display illuminates is approximately 3 seconds. The compass display turns off as soon as the ignition key is turned to the OFF or ACC position.

Vehicles With Navigation

The compass signal originates from the GPS antenna. No calibration or zone adjustment is available, as the compass heading is based on the GPS signal. Refer to Accessories and Optional Equipment for information on the GPS signal.

Compass Accuracy (Without Navigation)

Driving near power lines, or driving in the area of large iron or steel structures can temporarily change the compass heading. If the compass remains inaccurate after driving near such objects, calibrate the compass. Refer to Compass Calibration Compass Calibration.

Most geographic areas (zones) have a magnetic north compass point that varies slightly from the northerly direction on maps. This variation is 4 degrees between the adjacent zones and becomes noticeable as the vehicle crosses multiple zones. A correct zone setting eliminates the error. Refer to Compass Zone Adjustment Compass Zone Adjustment.