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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 881 (Exterior Lighting System) >> Diagnostic Tests >> Autolamps >> Pinpoint Tests >> Pinpoint Test F: The Autolamps Are Inoperative >> Pinpoint Test F: The AUTOLAMPS Are Inoperative

Pinpoint Test F: The AUTOLAMPS Are Inoperative

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. F1 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 B1793 present? 
    1. YES  : Go to  F2.
    2. NO  : Go to  F4.
  2. F2 VERIFY DTC B1793 
    • Key in OFF position.
    • Disconnect: VSM C3008b
    • Measure the resistance between the VSM C3008b-10, circuit 218 (WH/VT), harness side and ground.
      • Fig 1: Measuring Resistance Between Vehicle Security Module C3008b-10, Circuit 218 (WH/VT), Harness Side And Ground
      GF0004585Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F3.
    2. NO  : Go to  F8.
  3. F3 CHECK CIRCUIT 218 (WH/VT) FOR A SHORT TO GROUND 
    • Disconnect: Light Sensor C286
    • Measure the resistance between the VSM C3008b-10, circuit 218 (WH/VT), harness side and ground.
      • Fig 2: Checking Circuit 218 (WH/VT) For Short To Ground
      GF0004585Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new light sensor. REFER to Light Sensor  in this article. TEST the system for normal operation.
  4. F4 CHECK THE INPUT FROM THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: VSM C3008b
    • Place the headlamp switch in the AUTO position.
    • Measure the voltage between the VSM C3008b-7, circuit 220 (VT/OG), harness side and ground.
      • Fig 3: Checking Input From Headlamp Switch
      GF0004586Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F6.
    2. NO  : TURN the headlamp switch off. Go to  F5 .
  5. F5 CHECK CIRCUIT 220 (VT/OG) FOR AN OPEN 
    • Disconnect: Headlamp Switch C2150a
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING.
    • Is the headlamp switch OK? 
    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.
  6. F6 MONITOR THE VSM OUTPUT WITH THE LIGHT SENSOR DISCONNECTED 
    • Connect: VSM C3008b
    • Disconnect: Light Sensor C286
    • Key in ON position.
    • Wait 10 seconds and observe the exterior lamps.
    • Are the exterior lamps illuminated? 
    1. YES  : Go to  F7.
    2. NO  : Go to  F8.
  7. F7 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Measure the voltage between the light sensor C286-2, circuit 218 (WH/VT), harness side and ground.
      • Fig 4: 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  F8.
  8. F8 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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