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Pinpoint Test N: One Turn Signal/Hazard Lamp Is Inoperative/Always On

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. N1 CHECK THE STOPLAMPS 
    • Apply and release the brake pedal while observing the stoplamps.
    • Do the stoplamps operate correctly? 
    • Yes:  GO to N2  .
    • No:  REFER to STOPLAMPS .
  2. N2 DETERMINE IF A TURN LAMP IS ALWAYS ON 
    • Ignition ON.
    • Monitor the turn lamps.
    • Is either front turn lamp always on? 
    • Yes:  GO to N3  .
    • No:  GO to  N4.
  3. N3 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB  C2280f.
    • Ignition ON.
    • Does the front turn lamp in question continue to illuminate? 
    • Yes:  REPAIR circuit CLS21 (BU/GN) (LH turn lamp) or circuit CLS25 (YE/VT) (RH turn lamp) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to  N10.
  4. N4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB  self-test.
    • Is DTC B2A27 or DTC B2A29 present? 
    • Yes:  GO to  N7.
    • No:  GO to N5  .
  5. N5 CHECK THE BULB HOLDER FOR A SHORT TO GROUND 
    • Disconnect: Inoperative Front Turn Lamp.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  Self-Test.
    • Clear the DTCs and  repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present) 
    • Activate the hazard flasher lamp function.
    • Measure the voltage between the inoperative turn lamp, harness side and ground as follows:
      VOLTAGE REFERENCE CHART

      Inoperative Turn Lamp Connector-Pin Circuit
      Edge 
      LH front C1023-3 CLS21 (BU/GN)
      RH front C1043-3 CLS25 (YE/VT)
      MKX 
      LH front headlamp C1021a-5 CLS21 (BU/GN)
      RH front headlamp C1041a-5 CLS25 (YE/VT)
      Fig 1: Measuring Voltage Between Inoperative Turn Lamp And Ground
      G06503766Courtesy of FORD MOTOR CO.
    • Does the voltage alternate between 0 and greater than 10 volts? 
    • Yes:  For Edge, INSTALL a new bulb holder. TEST the system for normal operation.

      For MKX, INSTALL a new headlamp assembly. REFER to HEADLAMP ASSEMBLY . TEST the system for normal operation.

    • No:  GO to N6  .
  6. N6 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Turn the hazard lamps off.
    • Disconnect: SJB  C2280f.
    • Measure the resistance between the SJB  C2280f-21 (DTC B2A2A), circuit CLS21 (BU/GN), harness side and ground; or between the SJB  C2280f-23 (DTC B2A28), circuit CLS25 (YE/VT), harness side and ground.
      Fig 2: Measuring Resistance Between SJB C2280F-21 (DTC B2A2A), Circuit CLS21 (BU/GN) And Ground
      G06065282Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  N10.
    • No:  REPAIR circuit CLS21 (BU/GN) (LH turn lamp) or circuit CLS25 (YE/VT) (RH turn lamp) for a short to ground. After the repair:

      If no DTCs are present, TEST the system for normal operation.

      If DTC B106E is present, CLEAR the DTCs and  REPEAT the self-test (required to enable the turn lamp output driver if DTC B106E is present)  . TEST the system for normal operation.

      If DTC B106F is present, INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

  7. N7 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP 
    • Ignition OFF.
    • Disconnect: Inoperative Turn Lamp.
    • Turn the hazard lamps on.
    • Measure the voltage between the inoperative turn lamp, harness side and ground as follows:
      VOLTAGE REFERENCE CHART

      Inoperative Turn Lamp Connector-Pin Circuit
      Edge 
      LH front C1023-3 CLS21 (BU/GN)
      RH front C1043-3 CLS25 (YE/VT)
      MKX 
      LH front headlamp C1021a-5 CLS21 (BU/GN)
      RH front headlamp C1041a-5 CLS25 (YE/VT)
      Fig 3: Measuring Voltage Between Inoperative Turn Lamp And Ground
      G06503766Courtesy of FORD MOTOR CO.
    • Does the voltage alternate from 0 volts to greater than 10 volts? 
    • Yes:  GO to N8  .
    • No:  GO to  N9.
  8. N8 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP USING THE CONNECTOR GROUND 
    NOTE: Make sure the headlamps operate correctly before continuing with diagnostics for the turn lamps.
    • For Edge, measure the voltage between the inoperative turn lamp connector, harness side as follows:
      VOLTAGE REFERENCE CHART

      Inoperative Turn Lamp Connector-Pin/Circuit Connector-Pin/Circuit
      LH front C1023-3 C1023-1
      CLS21 (BU/GN) GD123 (BK/GY)
      RH front C1043-3 C1043-1
      CLS25 (YE/VT) GD120 (BK/GN)
      Fig 4: Measuring Voltage Between LH Rear Lamp C412-3, Circuit CLS18 (GY/BN) And LH Rear Lamp C412-1, Circuit GD149 (BK/GY)
      G06099167Courtesy of FORD MOTOR CO.
    • For MKX, measure the voltage between the inoperative turn lamp connector, harness side as follows:
      VOLTAGE REFERENCE CHART

      Inoperative Turn Lamp Connector-Pin/Circuit Connector-Pin/Circuit
      LH front headlamp C1021a-5 C1021a-6
      CLS21 (BU/GN) GD123 (BK/GY)
      RH front headlamp C1041a-5 C1041a-6
      CLS25 (YE/VT) GD123 (BK/GY)
      Fig 5: Measuring Voltage Between Inoperative Turn Lamp Connector Harness Side
      G06503770Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  For Edge, INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.

      For MKX, REPAIR or INSTALL a new headlamp. REFER to HEADLAMP ASSEMBLY . CLEAR the DTCs. REPEAT the self-test.

    • No:  REPAIR circuit GD123 (BK/GY) (LH front turn) or circuit GD120 (BK/GN) (RH front turn lamp) for an open. CLEAR the DTCs. REPEAT the self-test.
  9. N9 CHECK LH OR RH TURN CIRCUIT FOR AN OPEN 
    • Disconnect: SJB  C2280f.
    • Measure the resistance between the inoperative turn lamp, harness side and the SJB  , harness side as follows:
      RESISTANCE REFERENCE CHART

      Inoperative Turn Lamp Connector-Pin SJB  Connector-Pin Circuit
      Edge 
      LH front C1023-3 C2280f-21 CLS21 (BU/GN)
      RH front C1043-3 C2280f-23 CLS25 (YE/VT)
      MKX 
      LH front headlamp C1021a-5 C2280f-21 CLS21 (BU/GN)
      RH front headlamp C1041a-5 C2280f-23 CLS25 (YE/VT)
      Fig 6: Measuring Resistance Between Inoperative Turn Lamp And SJB
      G06503771Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to N10  .
    • No:  REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test
  10. N10 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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