Pinpoint Test J: The Rear Video Is Inoperative

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 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 DISCONNECT .

J1 VERIFY VEHICLE EQUIPMENT - NAVIGATION
- Check the vehicle for navigation.
- Is the vehicle equipped with navigation?
- Yes: GO to J7.
- No: GO to J2.
J2 CHECK THE REVERSING LAMPS OPERATION
- Check the operation of the reversing lamps.
- Do the reversing lamps operate correctly?
- Yes: GO to J3.
- No: Refer to REVERSING LAMPS .
J3 CHECK FOR 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?
- Yes: GO to J9.
- No: GO to J4.
J4 CHECK THE AUTO-DIMMING INTERIOR MIRROR VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror C9039.
- Ignition ON.
- Measure the voltage between the auto-dimming interior mirror C9039-1, circuit CBP41 (BU), harness side and ground.
  
  Fig 1: Measuring Voltage Between Auto-Dimming Interior Mirror C9039-1 & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to J5.
- No: VERIFY the Smart Junction Box (SJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST the system for normal operation.
J5 CHECK THE AUTO-DIMMING INTERIOR MIRROR REVERSE INPUT CIRCUIT
- Apply the parking brake.
- Select REVERSE.
- Measure the voltage between the auto-dimming interior mirror C9039-2, circuit CLS10 (GN/BN), harness side and ground.
  
  Fig 2: Measuring Voltage Between Auto-Dimming Interior Mirror C9039-2 & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to J6.
- No: REPAIR the circuit. TEST the system for normal operation.
J6 CHECK THE AUTO-DIMMING INTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the auto-dimming interior mirror C9039-3, circuit GD139 (BK/YE), harness side and ground.
  
  Fig 3: Measuring Resistance Between Auto-Dimming Interior Mirror C9039-3 & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: INSTALL a new auto-dimming interior mirror. Refer to INSTALLATION . TEST the system for normal operation.
- No: REPAIR the circuit. TEST the system for normal operation.
J7 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 J8.
- No: Refer to DIAGNOSIS AND TESTING , DIAGNOSIS AND TESTING or DIAGNOSIS AND TESTING to diagnose the PRNDL.
J8 CHECK THE FDIM DISPLAY
- Select REVERSE.
- Observe the FDIM display.
- Does the FDIM display "PLEASE CHECK SURROUNDINGS FOR SAFETY" at the top of the display screen?
- Yes: GO to J9.
- No: INSTALL a new FDIM . Refer to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
J9 CHECK THE VIDEO CAMERA VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Disconnect: Video Camera C4357 (Fusion/MKZ) or C4234 (Milan).
- Ignition ON.
- For Fusion/MKZ, measure the voltage between the video camera C4357-1, circuit CBP35 (YE/GY), harness side and ground.
  
  Fig 4: Measuring Voltage Between Video Camera C4357-1 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the voltage between the video camera C4234-1, circuit (RD), harness side and ground.
  
  Fig 5: Measuring Voltage Between Video Camera C4234-1 & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to J10.
- No: VERIFY that the SJB fuse 35 (10A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
J10 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- For Fusion/MKZ, measure the resistance between the video camera C4357-3, circuit GD171 (BK/GY), harness side and ground.
  
  Fig 6: Measuring Resistance Between Video Camera C4357-3 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the resistance between the video camera C4234-6, circuit (BK), harness side and ground.
  
  Fig 7: Measuring Resistance Between Video Camera C4234-6 & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to J11.
- No: REPAIR the circuit. TEST the system for normal operation.
J11 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND
- For Fusion/MKZ, measure the resistance between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and ground and the video camera C4357-7, circuit RMP19 (BN/VT), harness side and ground.
  
  Fig 8: Measuring Resistance Between Video Camera C4357-6 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the resistance between the video camera C4234-4, circuit (WH), harness side and ground; and between the video camera C4234-5, circuit RMP19 (BK), harness side and ground.
  
  Fig 9: Measuring Resistance Between Video Camera C4234-4 & Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: GO to J13.
- No: GO to J2.
J12 CHECK THE AUTO-DIMMING INTERIOR MIRROR (WITHOUT NAVIGATION) OR FDIM (WITH NAVIGATION) FOR AN INTERNAL SHORT
- Disconnect: Auto-Dimming Interior Mirror C9039 (Without Navigation) or FDIM C2410 (With Navigation).
- For Fusion/MKZ, measure the resistance between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and ground and the video camera C4357-7, circuit RMP19 (BN/VT), harness side and ground.
  
  Fig 10: Measuring Resistance Between Video Camera C4357-6 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the resistance between the video camera C4234-4, circuit (WH), harness side and ground; and between the video camera C4234-5, circuit RMP19 (BK), harness side and ground.
  
  Fig 11: Measuring Resistance Between Video Camera C4234-4 & Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: For vehicles without navigation, INSTALL a new auto-dimming interior mirror. Refer to INSTALLATION .
  For vehicles with navigation, INSTALL a new FDIM . Refer to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
- No: REPAIR the circuit in question. TEST the system for normal operation.
J13 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD
- For Fusion/MKZ, measure the resistance between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit DMP19 (BK), harness side.
  
  Fig 12: Measuring Resistance Between Video Camera C4357-6 & C4357-4
  Courtesy of FORD MOTOR CO.
- For Fusion/MKZ, measure the resistance between the video camera C4357-7, circuit RMP19 (BN/VT), harness side and the video camera C4357-4, circuit DMP19 (BK), harness side.
  
  Fig 13: Measuring Resistance Between Video Camera C4357-7 & C4357-4
  Courtesy of FORD MOTOR CO.
- For Milan, measure the resistance between the video camera C4234-4, circuit (WH), harness side and the video camera C4234-2, circuit (BK), harness side.
  
  Fig 14: Measuring Resistance Between Video Camera C4234-4 & C4234-2
  Courtesy of FORD MOTOR CO.
- For Milan, measure the resistance between the video camera C4234-5, circuit (BK), harness side and the video camera C4234-2, circuit (BK), harness side.
  
  Fig 15: Measuring Resistance Between Video Camera C4234-5 & C4234-2
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to J14.
- No: REPAIR the circuit in question. TEST the system for normal operation.
J14 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: Negative Battery Cable.
- Ignition ON.
- For Fusion/MKZ, measure the voltage between the video camera C4357-6, circuit VMP19 (WH/GN), harness side and ground.
  
  Fig 16: Measuring Voltage Between Video Camera C4357-6 & Ground
  Courtesy of FORD MOTOR CO.
- For Fusion/MKZ, measure the voltage between the video camera C4357-7, circuit RMP19 (BN/VT), harness side and ground.
  
  Fig 17: Measuring Voltage Between Video Camera C4357-7 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the voltage between the video camera C4234-4, circuit (WH), harness side and ground.
  
  Fig 18: Measuring Voltage Between Video Camera C4234-4 & Ground
  Courtesy of FORD MOTOR CO.
- For Milan, measure the voltage between the video camera C4234-5, circuit (BK), harness side and ground.
  
  Fig 19: Measuring Voltage Between Video Camera C4234-5 & Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: REPAIR the circuit in question. TEST the system for normal operation.
- No: GO to J15.
J15 CHECK VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror (Without Navigation) C9039.
- Disconnect: FDIM C2410 (With Navigation).
- For Fusion/MKZ, 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.
  
  Fig 20: Connecting Fused Jumper Wire Between Video Camera C4357-6 & C4357-7
  Courtesy of FORD MOTOR CO.
- For Milan, connect a fused jumper wire between the video camera C4234-4, circuit (WH), harness side and the video camera C4234-5, circuit (BK), harness side.
  
  Fig 21: Connecting Fused Jumper Wire Between Video Camera C4234-4 & C4234-5
  Courtesy of FORD MOTOR CO.
- 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.
  
  Fig 22: Measuring Resistance Between Auto-Dimming Interior Mirror C9039-8 & C9039-16
  Courtesy of FORD MOTOR CO.
- For vehicles with navigation, measure the resistance between the FDIM C2410-3, circuit VMP19 (WH/GN), harness side and the FDIM C2410-9, circuit RMP19 (BN/VT), harness side.
  
  Fig 23: Measuring Resistance Between FDIM C2410-3 & C2410-9
  Courtesy of FORD MOTOR CO.
- 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 Removal and Installation . TEST the system for normal operation.
- No: REMOVE the jumper wire. GO to J16.

J16 CHECK VIDEO SIGNAL CIRCUIT (+) FOR AN OPEN

Measure the resistance between the auto-dimming interior mirror (without navigation) or the FDIM (with navigation), harness side and the video camera, harness side.

TERMINAL RESISTANCE REFERENCE TABLE

Vehicle	Positive Meter Lead	Negative Meter Lead	Circuit
Fusion (without navigation)	C9039-8	C4357-6	VMP19 (WH/GN)
Fusion (with navigation)	C2410-3	C4357-6	VMP19 (WH/GN)
Milan (without navigation)	C9039-8	C4234-4	VMP19 (WH/GN)/(WH)
Milan (with navigation)	C2410-3	C4234-4	VMP19 (WH/GN)/(WH)
MKZ	C2410-3	C4357-6	VMP19 (WH/GN)

Fig 24: Measuring Resistance Between Auto-Dimming Interior Mirror Or FDIM & Video Camera

Courtesy of FORD MOTOR CO.

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.