Circuit/System Testing: Notes

Rear Vision System Always On

1. Ignition ON, observe the backup lamps. The backup lamps should be off.
2. If the lamps are illuminated test the signal circuit for a short to power. Refer to Backup Lamps Always On to diagnose the backup lamp circuit.
   • If the above condition is found, make the appropriate repair.
3. Replace the rear view camera image display module.

No Video - Radio Displays "Service Rear Vision Camera System"

1. Ignition ON, test the ignition 1 voltage circuit and ground circuit to the rear view camera image display module for a short to ground, a high resistance, or an open. Verify that a short to ground, a high resistance, or an open does not exist.
   • If any of the above conditions are found, make the appropriate repair
2. Ignition OFF, disconnect the harness connector at the rear view camera.
3. Ignition ON, with the scan tool enable the backup lamps. Test for 6-volt power source at the rear view camera harness connector pins 1 (+6V) and 2 (GND).
   • If the 6-volt power supply circuit does not test normal, test for 6 volts at the rear view camera image display module.
   • If the 6-volt power supply source tests normal at the rear view camera image display module, then repair the harness.
   • If the 6-volt power supply source does not test normal, replace the rear view camera image display module.
4. If the 6-volt power supply circuit tests normal, then test the video signal circuits for short to power, ground or an open/high resistance.
   • If the video circuits test normal, replace the rear view camera.
5. If after replacing the rear view camera and the system does not function properly, then replace the rear view camera image display module.