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Pinpoint Test G: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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.
NOTE: The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.
  1. G1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB self-test.
    • Was DTC B2008, B1791 or B1793 recorded? 
    1. YES  : For DTC B2008, go to  G10.

      For DTC B1791, go to  G12.

      For DTC B1793, go to  G16.

    2. NO  : Go to  G2.
  2. G2 CHECK THE SJB HEADLAMP SWITCH PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: SJB Data Logger
      • NOTE: Make sure the headlamp switch is lined up in the correct position when monitoring the PIDs.
    • Monitor the SJB headlamp switch PIDs (HD_LMP_S2 and HEAD_L) while moving the headlamp switch through all positions. Refer to the following chart.
      Headlamp Switch Position HD_LMP_S2 Expected Value HEAD_L Expected Value
      Autolamps AUTOLAMP OFF
      OFF - OFF
      PARKING LAMPS - -
      HEADLAMPS - HEADLAMP
    • Do the headlamp switch positions agree with the PIDs? 
    1. YES  : Go to  G9.
    2. NO  : Go to  G3.
  3. G3 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING.
    • Is the headlamp switch OK? 
    1. YES  : Go to  G4.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch  in this. CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK FOR CONTINUITY TO GROUND FROM THE HEADLAMP SWITCH 
      Fig 1: Checking Circuit GD116 (BK/VT) For Open (Headlamp Switch)
      GF0030469Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch C205-1, circuit GD116 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G7.
    2. NO  : Go to  G5.
  5. G5 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN (JOINT CONNECTOR TO GROUND) 
    • Disconnect: Joint Connector 6 C2365
      • Fig 2: Measuring Resistance Between Joint Connector 6 C2365-A, Circuit GD116 (BK/VT) & Ground
      GF0032271Courtesy of FORD MOTOR CO.
    • Measure the resistance between the joint connector 6 C2365-A, circuit GD116 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G6.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. G6 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN (HEADLAMP SWITCH TO JOINT CONNECTOR) 
      Fig 3: Measuring Resistance Between Headlamp Switch C205-1, Circuit GD116 (BK/VT) & Joint Connector 6 C2365-J
      GF0032272Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch C205-1, circuit GD116 (BK/VT), harness side and joint connector 6 C2365-J, circuit GD116 (BK/VT), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new joint connector. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  7. G7 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b
      • Fig 4: Measuring Resistance Between Headlamp Switch, Harness Side & Ground
      GF0032273Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      Connector-Pin Circuit
      C205-9 CLF19 (VT/GN)
      C205-8 CLF18 (BU/WH)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  G8.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  8. G8 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
      Fig 5: Measuring Resistance Between Headlamp Switch, Harness Side & SJB
      GF0032274Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch, harness side and the SJB, harness side as follows:
      Headlamp Switch Connector-Pin SJB Connector-Pin Circuit
      C205-9 C2280b-50 CLF19 (VT/GN)
      C205-4 C2280b-47 CLF23 (WH/VT)
      C205-3 C2280b-31 CLS34 (GY)
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  G18.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  9. G9 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Key in OFF position.
    • Disconnect: Light Sensor C286 or C287
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
      • Fig 6: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023441Courtesy of FORD MOTOR CO.
    • For vehicles with EATC, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 7: Measuring Voltage Between Light Sensor C287A-A, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023442Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C287a-A, circuit VLF14 (BU/BN), harness side and ground.
    • Is the voltage approximately 5 volts? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor  in this. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G18.
  10. G10 CHECK THE WINDSHIELD WIPER MOTOR 
    • Disconnect: Windshield Wiper Motor C1552
    • Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test
    • Repeat the SJB self-test.
    • Is DTC B2008 still present? 
    1. YES  : Go to  G11.
    2. NO  : INSTALL a new windshield wiper motor. REFER to WIPERS AND WASHERS . TEST the system for normal operation.
  11. G11 CHECK CIRCUIT CRW01 (WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280f
      • Fig 8: Measuring Resistance Between Windshield Wiper Motor C1552-2, Circuit CRW01 (WH) & Ground
      GF0014546Courtesy of FORD MOTOR CO.
    • Measure the resistance between the windshield wiper motor C1552-2, circuit CRW01 (WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G18.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  12. G12 CHECK CIRCUIT GD115 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Light Sensor C286 or C287
      • Fig 9: Measuring Resistance Between Light Sensor C286-4, Circuit GD115 (BK/GY), Harness Side & Ground
      GF0030473Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the resistance between the light sensor C286-4, circuit GD115 (BK/GY), harness side and ground.
      • Fig 10: Measuring Resistance Between Light Sensor C287-B, Circuit GD115 (BK/GY), Harness Side & Ground
      GF0023444Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the resistance between the light sensor C287-B, circuit GD115 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G13.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  13. G13 CHECK CIRCUIT VLF14 (BU/BN) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280b
    • Key in ON position.
      • Fig 11: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023441Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 12: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023442Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G14.
  14. G14 CHECK CIRCUIT VLF14 (BU/BN) FOR AN OPEN 
    • Key in OFF position.
      • Fig 13: Measuring Resistance Between Light Sensor C286-2, Circuit VLF14 (BU/BN) & SJB C2280B-46
      GF0023445Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and the SJB C2280b-46, circuit VLF14 (BU/BN), harness side.
      • Fig 14: Measuring Resistance Between Light Sensor C287-A, Circuit VLF14 (BU/BN) & SJB C2280B-46
      GF0023446Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the resistance between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and the SJB C2280b-46, circuit VLF14 (BU/BN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G15.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  15. G15 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1791) 
    • Connect: SJB C2280b
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
      • Fig 15: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023441Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 16: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023442Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
    • Is the voltage approximately 5 volts? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor  in this. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G18.
  16. G16 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1793) 
    • Disconnect: Light Sensor C286 or C287
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
      • Fig 17: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023441Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 18: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023442Courtesy of FORD MOTOR CO.
    • On vehicles with manual temperature control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
    • Is the voltage approximately 5 volts? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor  in this. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  G17.
  17. G17 CHECK CIRCUIT VLF14 (BU/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280b
      • Fig 19: Measuring Resistance Between Light Sensor C286-2, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023447Courtesy of FORD MOTOR CO.
    • On vehicles with EATC, measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 20: Measuring Resistance Between Light Sensor C287-A, Circuit VLF14 (BU/BN), Harness Side & Ground
      GF0023448Courtesy of FORD MOTOR CO.
    • On vehicles with manual temperature control, measure the resistance between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G18.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  18. G18 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . 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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