Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- If not within the specified range, refer to Charging System Test .
Ignition OFF, disconnect the harness connectors at the appropriate module.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the appropriate ground circuit terminals listed below and ground.
- Terminal 5 (PPS)
- Terminal 13 (IPC)
- Terminal 8 X1 (amplifier, radio)
- Terminal 7 X2 (rear object)
- If greater than the specified range, test the ground circuit for an open/high resistance.
Verify that a test lamp illuminates between the appropriate B+ circuit terminals listed below and ground.
- Terminal 1 (IPC, PPS)
- Terminal 1 X1 (radio)
- Terminal 4 X1 (amplifier)
- Terminal 1 X2 (rear object)
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, replace the appropriate module.