Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
It is recommended that component testing is performed before circuit testing when diagnosing steering wheel controls.
CAUTION:
Refer to SIR Caution
.
- Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
- Ignition ON, test for 11.5-12.5 volts between the 12-volt reference circuit terminal 3 and ground.
- If less than specified value, test the 12-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
- If greater than the specified value, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- Test for the 0 volts between the signal circuit terminal 4 and ground.
- If greater than specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- Test for 11.5-12.5 volts between the 12-volt reference circuit terminal 3 and the signal circuit terminal 4.
- If less than specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition OFF, disconnect the harness connector C1 at the BCM.
- Test for infinite resistance between the signal circuit terminal 6 and ground.
- If less than specified value, test the signal circuit for a short to ground.
- If all circuits test normal, test or replace switch.