Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the 14-volt and 42-volt harness connectors at the APM.
- Test for less than 1.0 ohm between the APM chassis and ground.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit connector X3 terminal 1 and ground.
- 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 APM.
IMPORTANT:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.