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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 434 (Exterior Lighting System) >> Diagnosis And Testing >> Headlamps >> Pinpoint Tests >> Pinpoint Test D: The Low Beam(s) Are Always On >> Pinpoint Test D: The Low Beam(S) Are Always On

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

WARNING: This page is about a different car, the 2013 Ford Mustang. 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? 
  2. D2 CHECK THE SJB HEADLAMP SWITCH PIDs 
    NOTE: Make sure the headlamp switch is lined up in the correct position when monitoring the PIDs.
    NOTE: Only one PID should indicate ON at each headlamp switch position.
    • Enter the following diagnostic mode on the scan tool: SJB Data Logger.
    • While moving the headlamp switch through all positions, monitor the SJB headlamp switch input PIDs (HDLMP_OFF_CKT, HDLMP_PRK_CKT, HDLMP_ON_CKT, HDLMP_AUT_CKT).
    • Do all of the headlamp switch positions agree with the PIDs (with only one PID indicating ON in each position)? 
    • Yes  : GO to  D7.
    • No  : If the PID HDLMP_AUT_CKT disagrees, GO to PINPOINT TEST H . Otherwise, GO to D3.
  3. D3 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C205-6 CLF23 (WH/VT) - Ground
      C205-2 CLS34 (GY) - Ground
      C205-7 CLF18 (BU/WH) - Ground
      Fig 1: Identifying Headlamp Switch C205 Connector Terminals
      G08646156Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 11 volts? 
    • Yes  : GO to D4.
    • No  : GO to  D5.
  4. D4 CHECK FOR VOLTAGE BETWEEN THE OFF CIRCUIT AND GROUND 
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C205-6 CLF23 (WH/VT) C205-3 GD116 (BK/VT)
      Fig 2: Identifying Headlamp Switch C205 Connector Terminals
      G08646157Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 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.
  5. D5 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C205-6 CLF23 (WH/VT) - Ground
      C205-2 CLS34 (GY) - Ground
      C205-7 CLF18 (BU/WH) - Ground
      Fig 3: Identifying SJB C2280B Switch Connector Terminals
      G08646158Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to D6.
    • No  : REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  6. D6 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C205-6 CLF23 (WH/VT) C2280b-47 CLF23 (WH/VT)
      C205-2 CLS34 (GY) C2280b-31 CLS34 (GY)
      C205-7 CLF18 (BU/WH) C2280b-30 CLF18 (BU/WH)
      Fig 4: Checking Headlamp Switch Input Circuits For Open
      G06258150Courtesy of FORD MOTOR CO.
    • Are the resistances less than 3 ohms? 
    • Yes  : GO to D7.
    • No  : REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
  7. D7 CHECK THE SJB OUTPUT 
    • Ignition OFF.
    • Disconnect: SJB C2280e.
    • Ignition ON.
    • Does the LH or RH headlamp continue to illuminate? 
    • Yes  : GO to D8.
    • No  : GO to  D9.
  8. D8 CHECK THE SJB LOW BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: Illuminated Headlamp.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      LH Headlamp 
      C1509-1 CLF04 (BN/BU) - Ground
      RH Headlamp 
      C1510-1 CLF05 (BU/GN) - Ground
      Fig 5: Identifying Illuminated Headlamp Switch Connector Terminals
      G08646160Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit CLF04 (BN/BU) (LH headlamp) or circuit CLF05 (BU/GN) (RH headlamp) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No  : INSTALL a new ballast. REFER to BALLAST . TEST the system for normal operation.
  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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