Rear Vision Camera System Malfunction (without Navigational Radio)
Rear Vision Camera System Malfunction (without Navigational Radio)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
When the transmission is placed into REVERSE while engine is running, a 12 V signal is sent to the inside rearview mirror and rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera; the inside rearview mirror is supplied a common ignition voltage and ground source that is shared with other mirror operations. The rearview camera sends video information to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.
Diagnostic Aids
A poor video image can be caused by ice, snow, and mud buildup on the lens of the rearview camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect the image quality.
Reference Information
Schematic Reference
Object Detection Schematics [1][2]Collision Avoidance and Parking Assist Systems
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Object Detection Description and Operation (UVC) Object Detection (UVC)Object Detection Description and Operation (UD7) Object Detection (UD7)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Circuit/System Verification
1. Verify there are no debris on the rearview camera lens.
• If debris are found on the lens
Clean the debris from the lens.
• If no debris are found on the lens
2. Engine running, transmission in park.
3. Verify the backup lamps are not ON.
• If the backup lamps are ON
Refer to Rearview Camera System Always On
• If the backup lamps are not ON
4. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
5. Verify backup lamps are ON.
• If the backup lamps are not ON
Refer to Backup Lamps Malfunction Backup Lamps Malfunction.
• If the backup lamps are ON
6. Verify a clear rear vision image is displayed on the inside rearview mirror.
• If a clear image is not displayed
Refer to Rearview Camera System Does Not Display.
• If a clear image is displayed
7. All OK.
Circuit/System Testing
Rearview Camera System Always On
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the rearview camera.
2. Engine running, transmission in park.
3. Verify a test lamp does not illuminate between the control circuit terminal 9 and ground.
• If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the BCM, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage in the circuit.
• If less than 1 V, refer to Backup Lamps Malfunction Backup Lamps Malfunction.
• If the test lamp does not illuminate
4. Replace the rearview camera.
Rearview Camera System Does Not Display
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the inside rearview mirror. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 8 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
4. Verify a test lamp illuminates between the control circuit terminal 9 and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the BCM, ignition ON.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Backup Lamps Malfunction Backup Lamps Malfunction.
• If the test lamp illuminates
Note:
Use only the J39200 DMM. Using a DMM other than the J39200 may result in an inaccurate measurement and lead to a misdiagnosis.
5. Ignition OFF, connect a DMM between the signal circuit terminal 6 and the signal circuit terminal 7. Set the DMM to the AC voltage mode and press the Hz button to measure frequency. Ignition ON.
6. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
7. Verify the frequency is between 1 Khz and 100 Khz.
• If the frequency is not between 1 Khz and 100 Khz
1. Ignition OFF, disconnect the harness connector at the rearview camera. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.
• If 10 ohms or greater, test the ground circuit for an open/high resistance.
• If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
• If the test lamp does not illuminate and the circuit fuse is good, test the ignition circuit for an open/high resistance.
• If the test lamp does not illuminate and the circuit fuse is open, test the ignition circuit for a short to ground. If the circuit tests normal, replace the rearview camera.
• If the test lamp illuminates
5. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
6. 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.
• If the test lamp illuminates.
7. Ignition ON.
8. Test for less than 1 V between the signal circuits listed below and ground.
* Terminal 1
* Terminal 4
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V.
9. Ignition OFF.
10. Test for infinite resistance between the signal circuits listed below and ground.
* Terminal 1
* Terminal 4
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance.
11. Test for less than 2 ohms in the signal circuits listed below end to end.
* Terminal 1 at the rearview camera harness connector and terminal 6 at the inside rearview mirror harness connector
* Terminal 4 at the rearview camera harness connector and terminal 7 at the inside rearview mirror harness connector
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms.
12. Replace the rearview camera.
• If the frequency is between 1 Khz and 100 Khz
8. Connect the harness connector at the inside rearview mirror.
9. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
10. Verify a clear rear vision image is displayed on the inside rearview mirror.
• If a clear image is not displayed
Replace the inside rearview mirror.
• If a clear image is displayed
11. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Rearview Camera Replacement (Traverse) Service and RepairRearview Camera Replacement (Acadia, Enclave, OUTLOOK) Service and Repair
* Control Module References Control Module References for BCM replacement, programming, and setup