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Pinpoint Test

  1. CHECK THE OPERATION OF THE REVERSING LAMPS
    1. Ignition ON.
    2. Move the selector lever through the entire range.
      • Do the reversing lamps illuminate only in REVERSE? 
  2. VERIFY THE FORWARD AND REARWARD FACING SENSORS ARE NOT BLOCKED
    1. Verify the forward and rearward facing sensors are not blocked. Sources of blockage can include:
      • stickers, window decals or tags.
      • fold-down screens for TVs or Digital Video Disc (DVD) players.
      • non-Original Equipment Manufacturer (OEM) window tinting.
      • Were either of the sensors blocked? 
      • Yes:  If possible, REMOVE the blockage. If the blockage cannot be removed, ADVISE the customer that the blockage will effect the correct operation of the interior auto-dimming mirror.
      • No:  GO to step 3 .
  3. CHECK OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - DAYLIGHT CONDITIONS
    1. Ignition ON.
    2. Use a bright lamp to illuminate the forward facing sensor. The mirror should adjust to a high reflectance mode (mirror will be clear).
      Fig 1: Checking Operation Of Interior Auto-Dimming Mirror - Daylight Conditions
      G07427976Courtesy of FORD MOTOR CO.
      • Does the mirror adjust to the high reflectance (clear) mode? 
  4. CHECK OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITH GLARE
    1. Ignition ON.
      2. NOTE: Covering the sensor with a finger or hand is not adequate.
    2. Simulate nighttime conditions with glare:
      • Cover the forward sensor with black electrical tape or other dark material.
      • Illuminate the rearward facing sensor. The mirror should darken to a lower reflectance mode.
        Fig 2: Checking Operation Of Interior Auto-Dimming Mirror - Nighttime Conditions With Glare
        G07427977Courtesy of FORD MOTOR CO.
      • Did the mirror darken to a lower reflectance (darker) mode? 
      • Yes:  GO to step 5 .
      • No:  GO to step  7 .
  5. CHECK OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITHOUT GLARE
    1. Ignition ON.
      2. NOTE: Covering the sensor with a finger or hand is not adequate.
      Fig 3: Checking Operation Of Interior Auto-Dimming Mirror - Nighttime Conditions Without Glare
      G07427978Courtesy of FORD MOTOR CO.
    2. Simulate nighttime conditions without glare by covering the rearward facing sensor. The mirror should adjust to the high reflectance mode.
      • Did the mirror adjust to the high reflectance (clear) mode? 
      • Yes:  GO to step 6 .
      • No:  GO to step  7 .
  6. CHECK OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITH THE VEHICLE IN REVERSE
    1. Ignition ON.
      2. NOTE: Covering the sensor with a finger or hand is not adequate.
    2. Simulate nighttime conditions with glare:
      • Cover the forward sensor with black electrical tape or other dark material.
      • Illuminate the rearward facing sensor (mirror should darken at this time).
        Fig 4: Checking Operation Of Interior Auto-Dimming Mirror - Nighttime Conditions With Vehicle In Reverse
        G07427979Courtesy of FORD MOTOR CO.
    3. Select REVERSE.
      • Did the mirror adjust to a high reflectance (clear) mode? 
      • Yes:  The system is operating normally at this time. ADVISE the customer of the correct operation of the interior auto-dimming mirror.
      • No:  GO to step 7 .
  7. CHECK FOR VOLTAGE TO THE INTERIOR AUTO-DIMMING MIRROR
    1. Ignition OFF.
    2. Disconnect: Interior Auto-Dimming Mirror.
    3. Ignition ON.
    4. Measure:
      Fig 5: Interior Auto-Dimming Mirror Connector Reference Chart
      G07427980Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 11 volts? 
      • Yes:  GO to step 8 .
      • No:  VERIFY that Body Control Module (BCM) fuse 38 (10A) is OK. If OK, REPAIR the circuit for an open. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
  8. CHECK FOR GROUND TO THE INTERIOR AUTO-DIMMING MIRROR
    1. Ignition OFF.
    2. Measure:
      Fig 6: Interior Auto-Dimming Mirror Connector Reference Chart
      G07427981Courtesy of FORD MOTOR CO.
      • Is the resistance less than 3 ohms? 
      • Yes:  GO to step 9 .
      • No:  REPAIR the circuit.
  9. CHECK FOR VOLTAGE TO THE INTERIOR AUTO-DIMMING MIRROR REVERSE CIRCUIT
    1. Ignition ON.
    2. Select REVERSE.
    3. Measure:
      Fig 7: Interior Auto-Dimming Mirror Connector Reference Chart
      G07427982Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 11 volts? 
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