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Pinpoint Test D: The Low Beam(S) Are On Continuously

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK FOR AUTOLAMP DTCs 
    • Review the DTCs retrieved from the SJB  self-test.
    • Is DTC B1696, B1791, B1793 or B2008 present? 
    • Yes:  GO to PINPOINT TEST H .
    • No:  If equipped with autolamps, GO to D2  .

      If not equipped with autolamps, GO to  D3.

  2. D2 CHECK THE SJB AUTOLAMP ON REQUEST PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  DataLogger.
      • NOTE: Make sure the headlamp switch is in the OFF position when monitoring the PID.
    • Monitor the SJB  headlamp switch PID (HDLMP_AUT_CKT).
    • Does the PID indicate ON? 
  3. D3 CHECK THE SJB HEADLAMP SWITCH PIDs 
    NOTE: Make sure the headlamp switch is lined up in the correct position when monitoring the PIDs.
    • Enter the following diagnostic mode on the scan tool: SJB  DataLogger.
      • NOTE: Only one PID should indicate ON at each headlamp switch position.
    • While moving the headlamp switch through all positions, monitor the SJB  headlamp switch input PIDs (HDLMP_OFF_CKT, HDLMP_PRK_CKT, HDLMP_ON_CKT).
    • Do the headlamp switch positions agree with the PIDs (with only one PID indicating ON in each position)? 
    • Yes:  GO to  D8.
    • No:  GO to D4  .
  4. D4 CHECK FOR VOLTAGE SIGNALS TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch, harness side and ground as follows:
      VOLTAGE REFERENCE CHART

      Headlamp Switch Connector-Pin Circuit
      C205-4 CLF23 (WH/VT)
      C205-3 CLF34 (GY)
      C205-8 CLF18 (BU/WH)
      Fig 1: Measuring Voltage Between Headlamp Switch And Ground
      G06437302Courtesy of FORD MOTOR CO.
    • Are the voltage greater than 10 volts? 
    • Yes:  GO to D5  .
    • No:  GO to  D6.
  5. D5 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH USING THE CONNECTOR GROUND 
    • Measure the voltage between the headlamp switch C205-4, circuit CLF23 (WH/VT), harness side and the headlamp switch C205-1, circuit GD116 (BK/VT), harness side.
      Fig 2: Measuring Voltage Between Headlamp Switch C205-4, Circuit CLF23 (WH/VT) And Headlamp Switch C205-1, Circuit GD116 (BK/VT)
      G06503716Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.
    • No:  REPAIR circuit GD116 (BK/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
  6. D6 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB  C2280b.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      RESISTANCE REFERENCE CHART

      Headlamp Switch Connector-Pin Circuit
      C205-4 CLF23 (WH/VT)
      C205-3 CLS34 (GY)
      C205-8 CLF18 (BU/WH)
      Fig 3: Measuring Resistance Between Headlamp Switch And Ground
      G06503717Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to D7  .
    • No:  REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  7. D7 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Measure the resistance between the headlamp switch, harness side and the SJB  , harness side as follows:
      RESISTANCE REFERENCE CHART

      Headlamp Switch Connector-Pin SJB  Connector-Pin Circuit
      C205-4 C2280b-47 CLF23 (WH/VT)
      C205-3 C2280b-31 CLS34 (GY)
      C205-8 C2280b-30 CLF18 (BU/WH)
      Fig 4: Measuring Resistance Between Headlamp Switch And SJB
      G06503718Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to  D9.
    • No:  REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
  8. D8 CHECK THE SJB OUTPUT 
    • Disconnect: SJB  C2280e.
    • Does the LH or RH headlamp continue to illuminate? 
    • Yes:  REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BU/GN) (RH headlamp) for a short to voltage as necessary. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to D9  .
  9. D9 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? 
    • Yes:  INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • 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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