Pinpoint Test I: Poor Image Quality

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

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

I1 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Video Camera C4234.
- Measure the resistance between the video camera C4234-6, circuit (BN/RD), harness side and ground.
  
  Fig 1: Measuring Resistance Between Video Camera C4234-6 And Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: GO to I2 .
- No: REPAIR the circuit. CONNECT the negative battery cable. TEST the system for normal operation.
I2 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO GROUND WITH THE AUTO-DIMMING INTERIOR MIRROR (WITHOUT NAVIGATION) OR ACM (WITH NAVIGATION) DISCONNECTED
- Disconnect: Auto-Dimming Interior Mirror (Without Navigation) C9039 Or ACM (With Navigation) C240d.
- Measure the resistance between the video camera C4234-4, circuit (RD), harness side and ground and video camera C4234-5, circuit (BK), harness side and ground.
  
  Fig 2: Checking Video Camera Video Signal Circuits For Short To Ground
  Courtesy of FORD MOTOR CO.
- 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 CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD
- Measure the resistance between the video camera C4234-4, circuit (RD), harness side and video camera C4357-2, circuit (NONE), harness side.
  
  Fig 3: Measuring Resistance Between Video Camera C4234-4 And Video Camera C4234-2
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the video camera C4357-5, circuit (BK), harness side and video camera C4357-2, circuit (NONE), harness side.
  
  Fig 4: Measuring Resistance Between Video Camera C4234-5 And Video Camera C4234-2
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: GO to I4 .
- No: REPAIR the circuit in question. TEST the system for normal operation.
I4 CHECK VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Disconnect: Auto-Dimming Interior Mirror (Without Navigation) C9039.
- Disconnect: ACM (With Navigation) C240d.
- Connect a fused jumper wire between the video camera C4234-4, circuit (RD), harness side and the video camera C4234-5, circuit (BK), harness side.
  
  Fig 5: Connecting Fused Jumper Wire Between Video Camera C4234-4 And Video Camera 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 6: Measuring Resistance Between Auto-Dimming Interior Mirror C9039-8 And C9039-16
  Courtesy of FORD MOTOR CO.
- For vehicles with navigation, measure the resistance between the ACM C240d-6, circuit RMP19 (BN/VT), harness side and the ACM C240d-1, circuit VMP19 (WH/GN), harness side.
  
  Fig 7: Measuring Resistance Between ACM C240D-6 And C240D-1
  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 VIDEO CAMERA . TEST the system for normal operation.
- No: REMOVE the jumper wire. GO to I5 .
I5 CHECK VIDEO SIGNAL CIRCUIT (+) FOR AN OPEN
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C9039-8, circuit VMP19 (WH/GN), harness side and the video camera C4234-4, circuit (RD), harness side.
  
  Fig 8: Measuring Resistance Between Auto-Dimming Interior Mirror C9039-8 And Video Camera C4234-4
  Courtesy of FORD MOTOR CO.
- For vehicles with navigation, measure the resistance between the ACM C240c-1, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit (RD), harness side.
  
  Fig 9: Measuring Resistance Between ACM C240D-1 And Video Camera C4234-4
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: REPAIR circuit RMP19 (BN/VT) or (BK). TEST the system for normal operation.
- No: REPAIR circuit VMP19 (WH/GN) or (RD). TEST the system for normal operation.