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Pinpoint Test G: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 RETRIEVE THE VSM DTCs 
    NOTE: Make sure the headlamp switch is in the OFF position.
    • Key in ON position.
    • Carry out the VSM on-demand self-test.
    • Is DTC B1695 or B1792 present? 
    1. YES  : For DTC B1695, go to  G2.

      For DTC B1792, go to  G5.

    2. NO  : Go to  G4.
  2. G2 VERIFY DTC B1695 
    • Key in OFF position.
    • Disconnect: VSM C3008b
    • Key in ON position.
    • Measure the voltage between the VSM C3008b-7, circuit 220 (VT/OG), harness side and ground.
      • Fig 1: Measuring Voltage Between Vehicle Security Module C3008b-7, Circuit 220 (VT/OG), Harness Side And Ground
      GF0004586Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : Go to  G3.
    2. NO  : Go to  G8.
  3. G3 CHECK CIRCUIT 220 (VT/OG) FOR A SHORT TO VOLTAGE 
    • Disconnect: Headlamp Switch C2150a
    • Measure the voltage between the VSM C3008b-7, circuit 220 (VT/OG), harness side and ground.
      • Fig 2: Checking Circuit 220 (VT/OG) For A Short To Voltage
      GF0004586Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch  in this article. TEST the system for normal operation.
  4. G4 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Key in OFF position.
    • Disconnect: Light Sensor C286
    • Measure the voltage between the light sensor C286-2, circuit 218 (WH/VT), harness side and ground.
      • Fig 3: Checking For Voltage To Light Sensor
      GF0004587Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor  in this article. TEST the system for normal operation.
    2. NO  : Go to  G8.
  5. G5 CHECK CIRCUIT 875 (BK/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Light Sensor C286
    • Measure the resistance between the light sensor C286-5, circuit 875 (BK/LB), harness side and ground.
      • Fig 4: Checking Circuit 875 (BK/LB) For An Open
      GF0004588Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. G6 CHECK CIRCUIT 218 (WH/VT) FOR A SHORT TO VOLTAGE 
    • Disconnect: VSM C3008b
    • Key in ON position.
    • Measure the voltage between the light sensor C286-2, circuit 218 (WH/VT), harness side and ground.
      • Fig 5: Checking Circuit 218 (WH/VT) For Short To Voltage
      GF0004587Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  G7.
  7. G7 CHECK CIRCUIT 218 (WH/VT) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the light sensor C286-2, circuit 218 (WH/VT), harness side and the VSM C3008b-10, circuit 218 (WH/VT), harness side
      • Fig 6: Checking Circuit 218 (WH/VT) For An Open
      GF0004589Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor  in this article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. G8 CHECK FOR CORRECT VSM OPERATION 
    • Disconnect all the VSM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the VSM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new VSM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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