Pinpoint Test H: Poor Image Quality

Parking Aid - Video

Pinpoint Tests

Pinpoint Test H: Poor Image Quality

Normal Operation

A pair of shielded wires carries the video signal from the rear video camera to the interior rear view mirror. The rear video system provides a clear image of objects to the rear of the vehicle.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Video camera


PINPOINT TEST H: POOR IMAGE QUALITY

NOTE: Failure to disconnect the battery when instructed results in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.

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H1 CHECK AND CLEAN THE REAR VIDEO CAMERA LENS


- Clean and make sure that the video camera lens is clear of any debris.
- Test the video camera system and verify the video camera image.
- Is the video camera concern still present?

Yes
GO to H2.

No
The system is operating correctly at this time. The concern was caused by a dirty video camera lens.

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H2 CHECK THE VIDEO SIGNAL CIRCUITS INTEGRITY


- Ignition OFF.
- Disconnect: Interior Rear View Mirror C9039.
- Measure the resistance between the interior rear view mirror C9039-4, circuit 8-GK40 (WH/VT), harness side and the interior rear view mirror C9039-5, circuit 9-GK40 (BN/WH), harness side.




- Is the resistance between 74 and 106 ohms?

Yes
GO to H8.

No
GO to H3.

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H3 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN


- Disconnect: Negative Battery Cable.
- Disconnect: Video Camera C4357.
- Measure the resistance between the video camera C4357-5, circuit 31-GK40 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to H4.

No
REPAIR the circuit. CONNECT the negative battery cable. TEST the system for normal operation.

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H4 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND


- Measure the resistance between the video camera C4357-4, circuit 8-GK40 (WH/VT), harness side and ground and video camera C4357-3, circuit 9-GK40 (BN/WH), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to H5.

No
REPAIR the circuit in question. TEST the system for normal operation.

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H5 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD


- Measure the resistance between the video camera C4357-4, circuit 8-GK40 (WH/VT), harness side and video camera C4357-6, circuit 48-GK40 (shield), harness side.




- Measure the resistance between the video camera C4357-3, circuit 9-GK40 (BN/WH), harness side and video camera C4357-6, circuit 48-GK40 (shield), harness side.




- Are the resistances greater than 10,000 ohms?

Yes
GO to H6.

No
REPAIR the circuit in question. TEST the system for normal operation.

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H6 CHECK VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR AN OPEN


- Connect a fused jumper wire between the video camera C4357-4, circuit 8-GK40 (WH/VT), harness side and the video camera C4357-3, circuit 9-GK40 (BN/WH), harness side.




- Measure the resistance between the interior rear view mirror C9039-4, circuit 8-GK40 (WH/VT), harness side and the interior rear view mirror C9039-5, circuit 9-GK40 (BN/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
REMOVE the jumper wire. GO to H8.

No
REMOVE the jumper wire. GO to H7.

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H7 CHECK VIDEO (-) SIGNAL CIRCUIT FOR AN OPEN


- Measure the resistance between the interior rear view mirror C9039-5, circuit 9-GK40 (BN/WH), harness side and the video camera C4357-3, circuit 9-GK40 (BN/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
REPAIR the circuit 8-GK40 (WH/VT). TEST the system for normal operation.

No
REPAIR the circuit 9-GK40 (BN/WH). TEST the system for normal operation.

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H8 CHECK FOR CORRECT VIDEO CAMERA OPERATION


- Connect all disconnected connectors.
- Disconnect the video camera connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the video camera connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new video camera. REFER to Video Camera - Rear Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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