Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, test for less than 1.0 Ω between the accessory DC power control module case and ground strap.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Disconnect harness connector X3 of the accessory DC power control module.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A and ground.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the accessory DC power control module for a short to ground.
- Ignition OFF, disconnect harness connector X1 of the accessory DC power control module.
- Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the wake up signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the serial data gateway module.
- If all circuits test normal, replace the accessory DC power control module.