GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Sierra - 4WD 🢒 Body and Accessories 🢒 Stationary Windows 🢒 Magnetic Field Description
  1. If there is a strong magnetic field in the area near the mirror, the compass circuit cannot compensate for the magnetic field.
  2. Inspect for the following possible magnetic fields:
    3. • Magnetic antenna mount
    • Magnetic notepad holder
    • Any similar magnitized items in the area of the mirror.
  3. In order to fix a condition with a strong magnetic field, perform the following procedure:
    4. • Remove the magnetic item.
    • Turn the mirror OFF for 30 seconds.
    • Turn the mirror back ON.
    • If the mirror comes back on displaying direction or a C, inform the vehicle owner of offending magnetic part. Refer to Compass Calibration Description .
    • If the mirror still displays all segments, replace the mirror assembly.