When the transmission is placed into REVERSE, a 12 volt signal is sent to the rear vision camera and rearview mirror indicating that the vehicle is in reverse and image display is requested. Ignition voltage and ground are supplied to the rear vision camera. The rearview mirror is supplied ignition voltage and a common ground. The rear vision camera sends video information to the LCD display located in the rearview mirror. The video signal is shielded to reduce electronic interference which may degrade the video signal and cause a distorted or degraded image.

A poor video image can be caused by mud or dirt buildup on the lens of the rearview camera. Extreme lighting conditions can also affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high temperatures can also affect the image quality.

Schematic Reference

Object Detection Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Object Detection Description and Operation

Electrical Information Reference

1. Inspect the rear vision camera and verify there are no debris on the lens and that the bezel or bezel seal is not damaged.

⇒	If debris are found on the lens, clean the lens. If the lens, bezel, or bezel seal are damaged, replace as necessary.

2. Ignition ON, vehicle in PARK, verify the backup lamps are off.

⇒	If the backup lamps are illuminated, refer to Rear Vision Camera System Always On.

3. Vehicle in REVERSE, verify a clear rear vision image is displayed on the inside rearview mirror.

⇒	If a clear image is not displayed, refer to Rear Vision Camera System Does Not Display.

Rear Vision Camera System Always On

1. Ignition OFF, disconnect the harness connector at the rear vision camera.
2. Ignition ON, transmission in PARK, verify a test lamp does not illuminate between the control circuit terminal 3 and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, refer to Backup Lamps Malfunction.

3. If all circuits test normal, test or replace the rear vision camera.

Rear Vision Camera System Does Not Display

1. Ignition OFF, disconnect the harness connector at the rear vision camera.
2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

4. Park brake applied, transmission in REVERSE, verify a test lamp illuminates between the control circuit terminal 3 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, disconnect the harness connector at the inside rearview mirror.
6. Ignition ON, test for less than 1 V between the following signal circuit terminals at the rear vision camera harness connector and ground:

•	Signal (+) circuit terminal 1

•	Signal (-) circuit terminal 4

⇒	If greater than the specified range, test the signal circuit for a short to voltage.

7. Test for infinite resistance between the following circuit terminals at the rear vision camera harness connector and ground:

•	Signal (+) circuit terminal 1

•	Signal (-) circuit terminal 4

⇒	If not the specified value, test the circuit for a short to ground.

8. Test for less than 2 Ω between the signal (+) circuit terminal 1 at the rear vision camera harness connector and the signal (+) circuit terminal 6 at the inside rearview mirror harness connector.

⇒	If greater than the specified range, test the signal circuit for an open/high resistance.

9. Test for less than 2 Ω between the signal (-) circuit terminal 4 at the rear vision camera harness connector and the signal (-) circuit terminal 7 at the inside rearview mirror harness connector.

⇒	If greater than the specified range, test the signal circuit for an open/high resistance.

10. If all circuits test normal, test or replace the rear vision camera.
11. Ignition ON, transmission in REVERSE, verify a clear rear vision image is displayed on the inside rearview mirror.

⇒	If a clear rear vision image is not displayed, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for inside rearview mirror replacement, setup, and programming