Pinpoint Test W: Poor Image Quality
Parking Aid - Video
Pinpoint Tests
Pinpoint Test W: Poor Image Quality
Normal Operation
With the ignition switch in the RUN position, the video camera is supplied with a voltage signal.
For vehicles without navigation, with the gear selector in REVERSE (R) position, a reverse voltage signal is sent to the auto-dimming interior mirror supplying power to the display in the mirror. The video camera signal is sent to the auto-dimming interior mirror. The video signal from the video camera displays an image on the LH side of the auto-dimming interior mirror.
For vehicles with navigation, with the gear selector in 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 in the display of the ACM.
Poor image quality can be due to an open in the video camera ground circuit. The video circuits shorted to the shield or ground circuit can also cause poor image quality.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Video camera
PINPOINT TEST W: POOR IMAGE QUALITY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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W1 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Video Camera C4357 (Navigator) or C4360 (Expedition).
- For Navigator, measure the resistance between the video camera C4357-6, circuit GD133 (BK), harness side and ground.
- For Expedition, measure the resistance between the video camera C4360-6, circuit GD133 (LG), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to W2.
No
REPAIR the circuit. TEST the system for normal operation.
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W2 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND
- Connect: Negative Battery Cable.
- For Navigator, measure the resistance between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and ground; and between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and ground.
- For Expedition, measure the resistance between the video camera C4360-4, circuit VMP19 (GY), harness side and ground; and between the video camera C4360-5, circuit RMP19 (BK), harness side and ground.
- Are the resistances greater than 1,000 ohms?
Yes
GO to W4.
No
GO to W3.
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W3 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND WITH THE AUTO-DIMMING INTERIOR MIRROR (WITHOUT NAVIGATION) OR THE ACM (WITH NAVIGATION) DISCONNECTED
- Disconnect: Auto-Dimming Interior Mirror C9039 (Without Navigation) or ACM C240b (With Navigation).
- For Navigator, measure the resistance between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and ground; and between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and ground.
- For Expedition, measure the resistance between the video camera C4360-4, circuit VMP19 (GY), harness side and ground; and between the video camera C4360-5, circuit RMP19 (BK), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
For vehicles without navigation, INSTALL a new auto-dimming interior mirror. REFER to Mirrors.
For vehicles with navigation, INSTALL a new ACM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.
No
REPAIR the circuit in question. TEST the system for normal operation.
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W4 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO SHIELD
- For Navigator, measure the resistance between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and the video camera C4357-2, circuit DMP19 (BK), harness side.
- For Expedition, measure the resistance between the video camera C4360-4, circuit VMP19 (GY), harness side and the video camera C4360-2, circuit DMP19 (OG), harness side.
- Measure the resistance between the video camera C4357-5, circuit RMP19 (BN/VT) (Navigator) or C4360-5, circuit RMP19 (BK) (Expedition), harness side and the video camera C4357-2, circuit DMP19 (BK) (Navigator) or C4360-2, circuit DMP19 (OG) (Expedition), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to W5.
No
REPAIR the circuit in question. TEST the system for normal operation.
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W5 CHECK VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror (Without Navigation) C9039.
- Disconnect: ACM (With Navigation) C240b.
- For Navigator, connect a fused jumper wire between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and the video camera C4357-5, circuit RMP19 (BN/VT), harness side.
- For Expedition, connect a fused jumper wire between the video camera C4360-4, circuit VMP19 (GY), harness side and the video camera C4360-5, circuit RMP19 (BK), harness side.
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C9039-8, circuit VMP19 (WH/GN), harness side and the auto-dimming interior mirror C9039-16, circuit RMP19 (BN/VT), harness side.
- For vehicles with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the ACM C240b-6, 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 Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to W6.
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W6 CHECK VIDEO SIGNAL CIRCUIT FOR AN OPEN
- For Navigator without navigation, measure the resistance between the auto-dimming interior mirror C9039-8, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit VMP19 (WH/GN), harness side.
- For Expedition without navigation, measure the resistance between the auto-dimming interior mirror C9039-8, circuit VMP19 (WH/GN), harness side and the video camera C4360-4, circuit VMP19 (GY), harness side.
- For Navigator with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit VMP19 (WH/GN), harness side.
- For Expedition with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the video camera C4360-4, circuit VMP19 (GY), harness side.
- Is the resistance less than 5 ohms?
Yes
REPAIR the circuit RMP19 (BN/VT). TEST the system for normal operation.
No
REPAIR the circuit VMP19 (WH/GN). TEST the system for normal operation.
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