Circuit/System Testing

Rear Vision System Always On

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Ignition ON, vehicle in PARK, verify a test lamp does not illuminate between the control circuit terminal 9 and ground.
   • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit test normal, refer to Backup Lamps Malfunction .
3. If all circuits test normal, replace the inside rearview mirror.

Rear Vision System Does Not Display

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Ignition ON, vehicle in PARK, verify that a test lamp illuminates between the ignition circuit terminal 13 and ground.
   • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. Verify that a test lamp illuminates between the ignition circuit terminal 13 and the ground circuit terminal 8.
   • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
4. Park brake applied, transmission in reverse, verify that a test lamp illuminates between the control circuit terminal 9 and ground.
   • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
5. Ignition OFF, connect the harness connector at the inside rearview mirror. Disconnect the harness connector at the rearview camera.
6. Park brake applied, transmission in reverse, verify a test lamp illuminates between the ignition circuit terminal C and ground.
   • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
7. Park brake applied, transmission in reverse, verify a test lamp illuminates between the ignition circuit terminal C and the ground circuit terminal D.
   • If the test lamp does not illuminate, test the ground circuit for an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
8. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
9. Ignition ON, test for less than 1 volt between the following signal circuit terminals and ground:
   • Video + circuit terminal 1
   • Video- circuit terminal 2
   • If greater than the specified value, test the signal circuit for a short to voltage.
10. Test for infinite resistance between the following signal circuit terminals and ground:
    • Video + circuit terminal 1
    • Video- circuit terminal 2
    • If less than the specified value, test the signal circuit for a short to ground.
11. Test for less than 2 ohms of resistance between the video + circuit terminal 1 at the inside rearview mirror and the video + circuit terminal A at the rearview camera.
    • If greater than the specified range, test the video+ circuit for an open/high resistance.
12. Test for less than 2 ohm of resistance between the video- circuit terminal 2 at the inside rearview mirror and the video- circuit terminal E at the rearview camera.
13. If all circuits test normal, replace the rearview camera and test the system for proper operation. If the condition continues after replacement, replace the inside rearview mirror.