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Pinpoint Test M: The Parking, Rear And License Plate Lamps Are Always On

WARNING: This page is about a different car, the 2007 Ford Ranger. 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.
  1. M1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Key in OFF position.
    • Check the recorded results from the SJB self-test.
    • Was DTC B2261 recorded? 
    1. YES  : Go to  M2.
    2. NO  : Go to  M4.
  2. M2 CHECK THE HEADLAMP SWITCH 
    • Disconnect: Headlamp Switch C205
    • Do the parking lamps continue to illuminate? 
    1. YES  : Go to  M3.
    2. NO  : INSTALL a new headlamp switch. REFER to Headlamp Switch  in this article. CLEAR the DTCs. REPEAT the self-test.
  3. M3 CHECK CIRCUIT CLS30 (VT/WH) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280d
    • Measure the voltage between the headlamp switch C205-5, circuit CLS30 (VT/WH), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-5, CLS30 (VT/WH), Harness Side & Ground
      GF0011097Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  M8.
  4. M4 CHECK CIRCUIT CLS34 (GY) FOR A SHORT TO VOLTAGE (FRONT PARKING LAMPS) 
    • Disconnect: SJB C2280a
    • Do the front parking lamps continue to illuminate? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  M5.
  5. M5 CHECK CIRCUIT CLS34 (GY) FOR A SHORT TO VOLTAGE (REAR PARKING LAMPS) 
    • Disconnect: SJB C2280c
    • Do the rear parking lamps continue to illuminate? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  M6.
  6. M6 CHECK CIRCUIT CBP20 (GN) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the trailer tow C439-2, circuit CBP20 (GN), harness side and ground.
      Fig 2: Measuring Voltage Between Trailer Tow C439-2, CBP20 (GN), Harness Side & Ground
      GF0011098Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  M7.
  7. M7 CHECK CIRCUIT CBP01 (BU) FOR A SHORT TO VOLTAGE 
    • Disconnect: Instrument Panel Dimmer Switch C206
    • Measure the voltage between the SJB C2280c-26, circuit CBP01 (BU), harness side and ground.
      Fig 3: Measuring Voltage Between SJB C2280c-26, CBP01 (BU), Harness Side & Ground
      GF0011099Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  M8.
  8. M8 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? 
    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.
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