Rear Vision Camera: Testing and Inspection

DIAGNOSIS AND TESTING - REAR CAMERA INOPERATIVE





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Camera is activated when the ignition switch is in the RUN position. The (F923) circuit supplies power to the camera. The camera sends a video signal (std. NTSC i.e. TV) to the Telematics Gateway (TGW), using circuits (X970) camera signal, (X971) signal return and (X972) camera shield, which displays on the Integrated Center Stack (ICS) screen. The screen toggles functions displaying only one kind of image at a time. And in reverse, the rear camera has priority. The (Z917) circuit is ground for the system.

- When Monitored:
Ignition on, vehicle in reverse.

- Set Condition:
No rear picture is displayed on Integrated Center Stack (ICS) screen with the vehicle in reverse.





1. VERIFY OPERATION OF THE TGW AND BACKUP LAMPS
1. Verify the operation of the TGW and Backup Lamps.

Do the TGW and Backup Lamps operate correctly?

Yes

- Go To 2

No

- Diagnose any problems with the TGW and Backup Lamps.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (F923) FUSED RUN RELAY OUTPUT CIRCUIT




1. Turn the ignition off.
2. Apply the parking brake.
3. Disconnect the License Plate Lamp/Rear Camera Assembly harness connector.
4. Turn the ignition on.
5. Measure the voltage between the (F923) Fused Run Relay Output circuit and ground.

Is battery voltage present?

Yes

- Go To 3

No

- Repair the (F923) Fused Run Relay Output circuit for an open or short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (Z917) GROUND CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between ground and the (Z917) Ground Circuit.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the (Z917) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (X970) CAMERA SIGNAL, THE (X971) RETURN, AND THE (X972) SHIELD CIRCUITS FOR AN OPEN CIRCUIT




1. Disconnect the Telematics Gateway (TGW) C3 harness connector.
2. Measure the resistance of the (X970) (X971) and (X972) circuits between the Rear Camera harness connector and Telematics Gateway (TGW) C3 harness connectors.

Is the resistance below 5.0 Ohms on the (X970) (X971) or (X972) circuits?

Yes

- Go To 5

No

- Repair the appropriate circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. CHECK THE (X970) CAMERA SIGNAL, THE (X971) RETURN, AND THE (X972) SHIELD CIRCUITS SHORTED TO GROUND




1. Measure the resistance between ground and the (X970) (X971) and (X972) circuits.

Is the resistance below 5.0 Ohms on the (X970) (X971) or (X972) circuits?

Yes

- Repair the appropriate circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the License Plate Lamp/Rear Camera Assembly. Rear Camera - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.