Compass Displays No Heading
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the compass module.
- Test for less than 5 Ω between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the circuit for a short to voltage or an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the voltage circuit terminal 1 and ground.
- If the test lamp does not illuminate, repair the circuit for a short to ground or an open/high resistance.
- Ignition OFF, test for greater than 1 Ω between the compass LIN 3 data circuit terminal 3 and ground.
- If less than the specified range, test the LIN 3 data circuit for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the compass LIN 3 data circuit terminal 3 and ground
- If the test lamp illuminates, test the LIN 3 data circuit for a short to voltage.
- Ignition OFF, disconnect the X4 harness connector at the BCM.
- Test for less than 1 Ω between the compass LIN 3 data circuit terminal 3 to the BCM terminal 6.
- If greater than the specified range, repair the LIN 3 data circuit for an open/high resistance.
- If all circuits test normal, replace the compass module.