Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
- Ignition ON, test for B+ between the voltage reference circuit terminal 3 and ground.
- If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Test for B+ between the voltage reference circuit terminal 3 and the signal circuit terminal 4.
- If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition OFF, disconnect the X1 harness connector at the BCM.
- Test for infinite resistance between the signal circuit terminal 4 and ground.
- If less than the specified value, test the signal circuit for a short to ground.
- If all circuits test normal, test or replace the right steering wheel control switch.