Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector at the sunroof switch.
Test for less than 5 ohms between the low reference circuit terminal B and ground.
- If greater than the specified range, test the ground circuits listed below for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator.
  - Sunroof switch low reference circuit terminal B
  - Sunroof motor/actuator ground circuit terminal 1
Ignition ON, connect a 3A fused jumper wire between the signal circuit listed below and ground. The roof should be inoperative in at least one or more directions.
- Roof open terminal E
- Roof close terminal D
- If the roof moved in all directions, replace the sunroof switch.
Ignition OFF, disconnect the harness connector at the sunroof motor/actuator.
Test for less than 5 ohms between the ground circuit terminal 1 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
Verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance.
Ignition OFF, connect the harness connector at the sunroof motor/actuator.
Ignition ON, at the sunroof switch harness connector, test for B+ between the signal circuits listed below and ground.
- Roof open terminal E
- Roof close terminal D
- If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof motor/actuator.
If all circuit test normal, replace the sunroof motor/actuator.