Pinpoint Test H: The Rear Video Is Inoperative
Parking Aid - Video
Pinpoint Tests
Pinpoint Test H: The Rear Video Is Inoperative
Refer to Wiring Diagram Set 131, Parking Aid for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition switch is in the RUN position, the video camera receives voltage. For vehicles without navigation, with the gear selector in REVERSE (R), a reverse signal message is sent to the auto-dimming interior mirror over the Local Interconnect Network (LIN), enabling the system. The LIN is a dedicated single wire communication line that sends and receives network messages from the Body Control Module (BCM) to the auto-dimming interior mirror for the video camera, compass and electrochromatic mirror systems. For vehicles with navigation, with the gear selector in REVERSE (R), a reverse signal is sent from the BCM to the Audio Control Module (ACM) over the Medium Speed Controller Area Network (MS-CAN), enabling the system. A pair of shielded wires carries the video signal from the video camera and displays an image on the left portion of the auto-dimming interior mirror (for vehicles without navigation) or in the display of the ACM (for vehicles with navigation).
- DTC C1001:01 (Vision System Camera: General Electrical Failure) - a continuous DTC that sets in the ACM when no video signal is detected for more than 3 seconds when the vehicle is in REVERSE (R).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Video camera
- Auto-dimming interior mirror (without navigation)
- ACM (for vehicles with navigation)
PINPOINT TEST H: THE REAR VIDEO IS INOPERATIVE
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 results in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect / Connect.
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H1 CHECK AND CLEAN THE REAR VIDEO CAMERA LENS
- Clean and make sure the rear 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 REVERSING LAMPS OPERATION
- Check the operation of the reversing lamps.
- Do the reversing lamps operate correctly?
Yes
GO to H3.
No
REFER to Exterior Lighting Testing and Inspection.
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H3 VERIFY VEHICLE EQUIPMENT - NAVIGATION ACM
- Check the vehicle for a navigation ACM.
- Is the vehicle equipped with a navigation ACM?
Yes
GO to H6.
No
GO to H4.
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H4 CHECK FOR A VIDEO CAMERA SIGNAL
- Ignition OFF.
- Apply the parking brake.
- Ignition ON.
- Select REVERSE.
- Observe the auto-dimming interior mirror.
- Does the auto-dimming interior mirror momentarily display a blue screen then turn black?
Yes
The auto-dimming interior mirror is functional. There is no signal from the video camera. GO to H7.
No
GO to H5.
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H5 CHECK LIN OPERATION
- Check the operation of the compass.
- Does the compass display and operate correctly?
Yes
INSTALL a new interior rear view mirror. REFER to Rear View Mirrors Interior Rear View Mirror. TEST the system for normal operation.
No
REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection to diagnose the compass is inoperative.
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H6 CHECK THE ACM DISPLAY
- Observe the ACM while placing the vehicle in REVERSE (R).
- While selecting REVERSE (R), does the ACM screen switch to video camera mode and display "PLEASE CHECK SURROUNDINGS FOR SAFETY"?
Yes
The ACM display is functional. There is no signal from the video camera.GO to H7.
No
GO to H16.
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H7 CHECK THE VIDEO SIGNAL CIRCUITS INTEGRITY
- Ignition OFF.
- Disconnect: Auto-Dimming Interior MirrorC911 (Without Navigation) or ACM C240b (With Navigation) .
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the auto-dimming interior mirror C911-16, 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.
- Is the resistance between 74 and 106 ohms?
Yes
GO to H8.
No
GO to H10.
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H8 CHECK THE VIDEO CAMERA VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Disconnect: Video Camera C4357 .
- Ignition ON.
- Measure the voltage between the video camera C4357-1, circuit CBB49 (VT/GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to H9.
No
VERIFY the Battery Junction Box (BJB) fuse 49 (10A) is OK. If OK, REPAIR the circuit. If not OK, Refer to Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
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H9 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 GD122 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to H15.
No
REPAIR the circuit. TEST the system for normal operation.
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H10 CHECK THE VIDEO CAMERA SIGNAL CIRCUITS FOR A SHORT TO GROUND
- Disconnect: Video Camera C4357 .
- 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.
- Are the resistances greater than 10,000 ohms?
Yes
GO to H11.
No
REPAIR the circuit in question. TEST the system for normal operation.
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H11 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD
- 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.
- Measure the resistance between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and the video camera C4357-2, circuit DMP19 (BK), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to H12.
No
REPAIR the circuit in question. TEST the system for normal operation.
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H12 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 VMP19 (WH/GN), harness side and ground.
- Measure the voltage between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to H13.
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H13 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Ignition OFF.
- 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 vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the auto-dimming interior mirror C911-16, 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.
- Is the resistance less than 5 ohms?
Yes
REMOVE the jumper wire. GO to H15.
No
REMOVE the jumper wire. GO to H14.
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H14 CHECK THE VIDEO (+) SIGNAL CIRCUIT FOR AN OPEN
- Connect: Negative Battery Cable.
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit VMP19 (WH/GN), harness side.
- For vehicles 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.
- 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.
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H15 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 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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H16 CHECK FOR CORRECT ACM OPERATION
- Disconnect the ACM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ACM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ACM. REFER to Information and Entertainment Systems Audio Control Module (ACM). 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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