Pinpoint Test I: The Rear Video Is Inoperative
Parking Aid - Video
Pinpoint Tests
Pinpoint Test I: The Rear Video Is Inoperative
Normal Operation
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 on the Front Display Interface Module (FDIM). With the ignition switch in the RUN position, the video camera receives voltage through circuit CBP41 (BU) and grounded through circuit GD133 (BK).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Video camera
- FDIM
PINPOINT TEST I: THE REAR VIDEO IS INOPERATIVE
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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I1 VERIFY THE REVERSE SIGNAL INPUT
- Apply the parking brake.
- Ignition ON.
- Select REVERSE.
- Check the IC message center PRNDL indicator.
- Does REVERSE (R) appear in the message center?
Yes
GO to I2.
No
REFER to Instrument Panel, Gauges and Warning Indicators to diagnose the PRNDL.
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I2 CHECK THE FDIM DISPLAY
- Select REVERSE.
- The FDIM should display the text "PLEASE CHECK SURROUNDINGS FOR SAFETY" at the top of the screen.
- Does the FDIM display the text stated above?
Yes
GO to I3.
No
INSTALL a new ACM. TEST the system for normal operation.
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I3 CHECK THE VIDEO CAMERA VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Video Camera C4357.
- Ignition ON.
- Measure the voltage between the video camera C4357-1, circuit (RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to I4.
No
VERIFY that the SJB fuse 41 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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I4 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the video camera C4357-6, circuit GD133 (BK) or (WH) (with luggage switch), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to I5.
No
REPAIR the circuit. TEST the system for normal operation.
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I5 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND
- Disconnect: FDIM C2123.
- Measure the resistance between the video camera C4357-4, circuit (CLEAR), harness side and ground and video camera C4357-5, circuit (BK), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to I6.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I6 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD
- Measure the resistance between the video camera C4357-4, circuit (CLEAR), harness side and video camera C4357-2, circuit (OG), harness side.
- Measure the resistance between the video camera C4357-5, circuit (BK), harness side and video camera C4357-2, circuit (OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to I7.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I7 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: Negative Battery Cable.
- Ignition ON.
- Measure the voltage between the video camera C4357-4, circuit (CLEAR), harness side and ground.
- Measure the voltage between the video camera C4357-5, circuit (BK), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to I8.
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I8 CHECK VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Ignition OFF.
- Connect a fused jumper wire between the video camera C4357-4, circuit (CLEAR), harness side and the video camera C4357-5, circuit (BK), harness side.
- Measure the resistance between the FDIM C2123-3, circuit VMP19 (WH/GN), harness side and the FDIM 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 Service and Repair. TEST the system for normal operation. Component Test - Video Camera
No
REMOVE the jumper wire. GO to I9.
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I9 CHECK VIDEO SIGNAL CIRCUIT VMP19 (WH/GN) FOR AN OPEN
- Measure the resistance between the FDIM C2123-3, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit (CLEAR), harness side.
- Is the resistance less than 5 ohms?
Yes
REPAIR the circuit (BK). TEST the system for normal operation.
No
REPAIR the circuit (CLEAR). TEST the system for normal operation.
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