Diagnostic Aids
- A short to ground in the accessory voltage circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
- A short to ground in the ignition 1 voltage circuit of the ignition main relay 31 will cause an open fuse to the ignition switch. DTC B1428 should be current.
- The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters listed in Circuit/System Verification will determine if there is a power mode fault.