Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Montana SV6, 2007 Chevrolet Uplander, and 2007 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Refer to SIR Caution .

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
Disconnect the harness connector of the cruise control switch assembly.
Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit.
- If less than the specified value, check for an open/high resistance or a short to ground on the cruise control supply voltage circuit.
Ignition ON, verify that a test lamp illuminates between B+ the cruise control switch signal circuit.
- If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM.
Ignition OFF, test the cruise control switch signal circuit for a short to ground.
- If the circuit tests normal, test the component. If the circuits and the component tests are normal, replace the ECM.