Pinpoint Test I: Poor Image Quality

Parking Aid - Video

Pinpoint Test I: Poor Image Quality

Normal Operation

With the ignition switch in the RUN position, the video camera receives voltage. With the gear selector in the REVERSE (R) position, a reverse signal is sent from the Instrument Cluster (IC) to the Audio Control Module (ACM) over the Medium Speed Controller Area Network (MS-CAN), enabling the system. The video signal from the video camera displays an image on the Front Display Interface Module (FDIM).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Video camera

PINPOINT TEST I : POOR IMAGE QUALITY

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

I1 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Disconnect: Video Camera C4357.

- Measure the resistance between the video camera C4357-3, circuit GD149 (BK/GY), harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to I2.

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

I2 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND WITH THE FDIM (Front Display Interface Module) DISCONNECTED

- Disconnect: FDIM (Front Display Interface Module) C2123.

- Measure the resistance between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and ground; and between the video camera C4357-7, circuit RMP19 (BN/VT), harness side and ground.





Are the resistances greater than 10,000 ohms?

Yes
GO to I3.

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

I3 CHECK THE VIDEO SHIELD FOR AN OPEN

- Measure the resistance between the FDIM (Front Display Interface Module) C2123-2, circuit DMP19 (BK), harness side and the video camera C4357-4, circuit DMP19 (BK), harness side.





Is the resistance less than 5 ohms?

Yes
GO to I4.

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

I4 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD

- Measure the resistance between the video camera C4357-4, circuit DMP19 (BK), harness side and the video camera C4357-6, circuit VMP19 (WH/GN), harness side.





- Measure the resistance between the video camera C4357-4, circuit DMP19 (BK), harness side and the video camera C4357-7, circuit RMP19 (BN/VT), harness side.





Is the resistance greater than 10,000 ohms?

Yes
GO to I5.

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

I5 CHECK THE VIDEO SIGNAL CIRCUITS FOR AN OPEN

- Ignition OFF.

- Disconnect: FDIM (Front Display Interface Module) C2123.

- Connect a fused jumper wire between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and the video camera C4357-7, circuit RMP19 (BN/VT), harness side.





- Measure the resistance between the FDIM (Front Display Interface Module) C2123-3, circuit VMP19 (WH/GN), harness side and the FDIM (Front Display Interface Module) C2123-9, circuit RMP19 (BN/VT), harness side.





Are the resistances less than 5 ohms?

Yes
REMOVE the jumper wire. CARRY OUT the video camera component test. If the camera is inoperative, INSTALL a new video camera. REFER to Video Camera . TEST the system for normal operation. Component Tests and General Diagnostics

No
REMOVE the jumper wire. GO to I6.

I6 CHECK THE VIDEO SIGNAL (+) CIRCUIT FOR AN OPEN

- Measure the resistance between the FDIM (Front Display Interface Module) C2123-3, circuit VMP19 (WH/GN), harness side and the video camera C4357-6, circuit VMP19 (WH/GN), harness side.





Is the resistance less than 5 ohms?

Yes
REPAIR circuit RMP19 (BN/VT). TEST the system for normal operation.

No
REPAIR circuit VMP19 (WH/GN). TEST the system for normal operation.