Circuit/System Testing
WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Repair any brake system related symptoms and DTCs before performing this diagnostic.
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 C4 of the multifunction turn signal lever.
- Ignition ON, measure for 10 volts or greater at the multifunction turn signal lever control supply voltage circuit terminal 1.
- If less than the specified value, check for an open/high resistance or a short to ground on the multifunction turn signal lever control supply voltage circuit.
- Test the cruise control switch signal circuit for an open/high resistance, a short to ground or a short to voltage.
- If the circuits test normal, test the component. If the component tests normal, replace the PCM/ECM.