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Home >> Ford >> 2002 >> Taurus LX, 3.0 U >> Repair and Diagnosis >> External Pages >> Different car >> Section 2388 (Exterior Lighting System) >> Diagnostic Tests >> Turn Signal and Hazard Lamps >> Pinpoint Tests >> Pinpoint Test M: One Turn Signal/Hazard Lamp Is Inoperative/Always On >> Pinpoint Test M: One Turn Signal/Hazard Lamp Is Inoperative/Always On

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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. 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. M1 CHECK THE STOPLAMPS 
    • Apply and release the brake pedal while observing the stoplamps.
    • Do the stoplamps operate correctly? 
    1. YES  : Go to  M2.
    2. NO  : REFER to Stoplamps .
  2. M2 DETERMINE IF A TURN LAMP IS ALWAYS ON 
    • Key in ON position.
    • Monitor the turn lamps while placing the multifunction switch in the RH TURN and then LH TURN positions.
    • Is any turn lamp always on? 
    1. YES  : Go to  M3.
    2. NO  : Go to  M4.
  3. M3 CHECK CIRCUIT CLS21 (BU/GN) (LH TURN) OR CIRCUIT CLS25 (YE/VT) (RH TURN) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280f
    • Key in ON position.
    • Does the turn lamp in question continue to illuminate? 
    1. YES  : For the LH turn lamp, REPAIR circuit CLS21 (BU/GN). CLEAR the DTCs. REPEAT the self-test.

      For the RH turn lamp, REPAIR circuit CLS25 (YE/VT). CLEAR the DTCs. REPEAT the self-test.

    2. NO  : Go to  M9.
  4. M4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB on-demand self-test.
    • Was DTC B2A28 or B2A2A present? 
    1. YES  : Go to  M5.
    2. NO  : Go to  M6.
  5. M5 CHECK CIRCUIT CLS21 (BU/GN) (DTC B2A2A) OR CIRCUIT CLS25 (YE/VT) (DTC B2A28) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Inoperative Front Turn Lamp
    • Disconnect: SJB C2280f
      NOTE: For accurate test results on a Mariner, both turn lamps (front and corresponding side repeater) must be disconnected.
    • 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 1: Checking Circuits For Short To Ground
      GF0023457Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  M9.
    2. NO  : REPAIR the circuit in question. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  6. M6 CHECK THE GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Turn Lamp
    • Measure the resistance between the inoperative turn lamp, harness side and ground as follows
      Inoperative Turn Lamp Connector-Pin Circuit
      LH front C1023-1 GD120 (BK/GN)
      RH front C1043-1 GD120 (BK/GN)
      LH side turn signal lamp (Mariner) C1123-2 GD120 (BK/GN)
      RH side turn signal lamp (Mariner) C1122-2 GD120 (BK/GN)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  M7.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test
  7. M7 CHECK FOR VOLTAGE TO THE TURN LAMP 
    • Key in OFF position.
    • Disconnect: Inoperative Turn Lamp
    • Activate the hazard flasher lamp function.
    • Measure the voltage between the inoperative turn lamp, harness side and ground as follows
      Inoperative Turn Lamp Connector-Pin Circuit
      LH front C1023-3 CLS21 (BU/GN)
      RH front C1043-3 CLS25 (YE/VT)
      LH side turn signal lamp (Mariner) C1123-1 CLS21 (BU/GN)
      RH side turn signal lamp (Mariner) C1122-1 CLS25 (YE/VT)
    • Does the voltage alternate between 0 and greater than 10 volts? 
    1. YES  : INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test
    2. NO  : Go to  M8.
  8. M8 CHECK CIRCUIT CLS21 (BU/GN) (LH TURN) OR CIRCUIT CLS25 (YE/VT) (RH TURN) FOR AN OPEN 
    • Turn the hazard lamp function off.
    • Disconnect: SJB C2280f
    • Measure the resistance between the inoperative turn lamp, harness side and the SJB, harness side as follows:
      Inoperative Turn Lamp Connector-Pin Circuit
      LH front C1023-3 C2280f-21 CLS21 (BU/GN)
      RH front C1043-3 C2280f-23 CLS25 (YE/VT)
      LH side turn signal lamp (Mariner) C1123-1 C2280f-21 CLS21 (BU/GN)
      RH side turn signal lamp (Mariner) C1122-1 C2280f-23 CLS25 (YE/VT)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  M9.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test
  9. M9 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • 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 article. 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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