Circuit/System Verification

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, verify that no ignition, starter relay, brake pedal position sensor, immobilizer, or automatic transmission DTCs are set that would cause the ECM to disable engine starting.
- If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool BCM 5 V Ignition Switch parameter. Place the ignition switch in the crank position, the parameter should display Crank Request.
- If not the specified value, refer to Power Mode Mismatch .
Transmission range selector in park, verify the scan tool TCM Internal Mode Switch parameter displays Park.
- If the TCM Internal Mode Switch parameter does not indicate Park. Refer to Transmission Internal Mode Switch Logic .
Transmission in park or neutral, attempt to start the vehicle. The crank relay should click and the engine should begin cranking.
- If the KR27 starter relay does not click or the engine does not crank, refer to Circuit/System Testing .