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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 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. N1 DETERMINE IF A TURN LAMP IS ALWAYS ON 
    • Ignition ON.
    • Monitor the turn lamps.
    • Is either front turn lamp always on? 
    • Yes  : GO to N2.
    • No  : GO to  N3.
  2. N2 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 front turn lamp) or circuit CLS25 (YE/VT) (RH front turn lamp) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to  N9.
  3. N3 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB on-demand self-test.
    • Was DTC B2A27 or DTC B2A29 present? 
    • Yes  : GO to  N6.
    • No  : GO to N4.
  4. N4 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 LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
      Fig 1: Measuring Voltage Between LH Front Turn Lamp C1023-3, Circuit CLS21 (BU/GN), Harness Side And Ground
      G06065274Courtesy of FORD MOTOR CO.
    • Does the voltage alternate from 0 volts to greater than 11 volts? 
    • Yes  : INSTALL a new bulb holder. TEST the system for normal operation.
    • No  : GO to N5.
  5. N5 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND 
    • Turn the hazard lamps off.
    • Disconnect: SJB C2280f.
    • Measure the resistance between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
      Fig 2: Measuring Resistance Between Front Turn Lamp C1116-1 And Ground
      G06065277Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to  N9.
    • No  : REPAIR circuit CLS21 (BU/GN) (LH turn) or circuit CLS25 (YE/VT) (RH turn) for a short to ground. CLEAR the DTCs. REPEAT the self-test

      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 SJBSJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

  6. N6 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP 
    • Ignition OFF.
    • Disconnect: Inoperative Front Turn Lamp.
    • Ignition ON.
    • Turn the hazard lamps on.
    • Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
      Fig 3: Measuring Voltage Between LH Front Turn Lamp C1023-3, Circuit CLS21 (BU/GN), Harness Side And Ground
      G06065274Courtesy of FORD MOTOR CO.
    • Does the voltage alternate from 0 volts to greater than 11 volts? 
    • Yes  : GO to N7.
    • No  : GO to  N8.
  7. N7 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP USING THE CONNECTOR GROUND 
    • Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the LH front turn lamp C1023-1, circuit GD129 (BK/YE) harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the RH front turn lamp C1043-1, circuit GD129 (BK/YE) harness side.
      Fig 4: Measuring Voltage Between LH Front Turn Lamp C1023-3, Circuit CLS21 (BU/GN) And LH Front Turn Lamp C1023-1, Circuit GD129 (BK/YE)
      G06099183Courtesy of FORD MOTOR CO.
    • Does the voltage alternate from 0 volts to greater than 11 volts? 
    • Yes  : INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.
    • No  : REPAIR circuit GD129 (BK/YE) for an open. CLEAR the DTCs. REPEAT the self-test.
  8. N8 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR AN OPEN 
    • Turn the hazard lamps off.
    • Disconnect: SJB C2280f.
    • Measure the resistance between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-21, circuit CLS21 (BU/GN), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the SJB C2280f-23, circuit CLS25 (YE/VT), harness side.
      Fig 5: Checking SJB Turn Lamp Output Circuit For Open
      G06141816Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to  N9.
    • No  : REPAIR circuit CLS21 (BU/GN) (LH turn) or circuit CLS25 (YE/VT) (RH turn) for an open. CLEAR the DTCs. REPEAT the self-test
  9. N9 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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