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Pinpoint Test C: The Courtesy Lamps Stay On Continuously

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.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. C1 CHECK THE SJB DTCs FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS 
    NOTE: Make sure the dimmer switch is not in the defeat position.
    • Verify all the courtesy lamp switches are in the DOOR position.
    • Use the recorded results from the SJB continuous and on-demand self-test.
    • Are any DTCs recorded? 
    1. YES  : For DTCs B1320, B1328, B1336, or B1572, go to  C2.

      For DTC B1688, go to  C5.

      For DTC B2077, go to  C8.

      For DTC B2A35, go to  C7.

      For all other DTCs, REFER to DTC Charts .

    2. NO  : Go to  C13.
  2. C2 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect the suspect door ajar switch.
    • Measure the resistance between the suspect door ajar switch connector, harness side and ground as follows:
      Suspect Door Ajar Switch Connector-Pin Circuit
      LH front C525-6 GD182 (BK/GY)
      RH front C609-6 GD182 (BK/GY)
      LH rear C704-6 GD182 (BK/GY)
      RH rear C804-6 GD182 (BK/GY)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  3. C3 CHECK FOR A VOLTAGE SIGNAL TO THE DOOR AJAR SWITCH 
    • Measure the voltage between the suspect door ajar switch, component side and ground as follows:
      Suspect Door Ajar Switch Connector-Pin Circuit
      LH front C525-5 CPL26 (GN/VT)
      RH front C609-5 CPL31 (WH)
      LH rear C704-5 CPL36 (GN)
      RH rear C804-5 CPL39 (YE)
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new door latch in question. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C4.
  4. C4 CHECK THE DOOR AJAR SWITCH INPUT CIRCUITS 
    • Disconnect: SJB C2280c
    • Measure the resistance between the suspect door ajar switch, harness side and the SJB, harness side as follows:
      Location Suspect Ajar Switch Connector-Pin/ Circuit SJB Connector-Pin/ Circuit
      LH front door ajar switch C525-5
      CPL26 (GN/VT      		 C2280c-14
      CPL26 (GN/VT)
      RH front door ajar switch C609-5
      CPL31 (WH)      		 C2280c-2
      CPL31 (WH)
      LH rear door ajar switch C704-5
      CPL39 (YE)      		 C2280c-3
      CPL36 (GN)
      RH rear door ajar switch C804-5
      CPL39 (YE)      		 C2280c-15
      CPL39 (YE)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C13.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. C5 CHECK THE DIMMER SWITCH 
    • Key in OFF position.
    • Disconnect: Dimmer Switch C2065
    • Do the courtesy lamps continue to illuminate? 
    1. YES  : Go to  C6.
    2. NO  : INSTALL a new dimmer switch. REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION article. CLEAR the DTCs. REPEAT the self-test.
  6. C6 CHECK CIRCUIT CLN17 (BN) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b
    • Measure the resistance between the dimmer switch C2065-5, circuit CLN17 (BN), harness side and ground.
      • Fig 1: Checking Circuit For Short To Ground
      GF0023508Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C13.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  7. C7 CHECK CIRCUIT VLN33 (GY/VT) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Key in ON position.
    • Observe the courtesy lamps.
    • Do the courtesy lamps continue to illuminate? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  C13.
  8. C8 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Liftgate Glass Ajar Switch C479
    • Measure the resistance between the liftgate glass ajar switch C479-2, circuit GD182 (BK/GY), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0042728Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C9.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  9. C9 CHECK THE LIFTGATE GLASS AJAR SWITCH 
    • Connect a fused (5A) jumper wire between the liftgate glass ajar switch C479-3, circuit CPL44 (YE/OG), harness side and the liftgate glass ajar switch C479-2, circuit GD182 (BK/GY), harness side.
      • Fig 3: Checking Liftgate Glass Ajar Switch
      GF0042729Courtesy of FORD MOTOR CO.
    • Do the courtesy lamps turn off? 
    1. YES  : REMOVE the jumper wire. INSTALL a new liftgate glass latch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REMOVE the jumper wire. Go to  C10.
  10. C10 CHECK CIRCUIT CPL44 (YE/OG) FOR AN OPEN 
    • Connect: Liftgate Glass Ajar Switch C479
    • Disconnect: Liftgate Ajar Switch C478
      NOTE: Make sure the liftgate glass is closed.
    • Measure the resistance between the liftgate ajar switch C478-1, circuit CPL44 (YE/OG), harness side and ground.
      • Fig 4: Measuring Resistance
      GF0042730Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C11.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  11. C11 CHECK THE LIFTGATE AJAR SWITCH 
    • Connect a fused (5A) jumper wire between the liftgate ajar switch C478-2, circuit CPL58 (GY/OG), harness side and the liftgate ajar switch C478-1, circuit CPL44 (YE/OG), harness side.
      • Fig 5: Checking Liftgate Ajar Switch
      GF0042731Courtesy of FORD MOTOR CO.
    • Do the courtesy lamps turn off? 
    1. YES  : REMOVE the jumper wire. INSTALL a new liftgate latch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REMOVE the jumper wire. Go to  C12.
  12. C12 CHECK CIRCUIT CPL58 (GY/OG) FOR AN OPEN 
    • Connect: Liftgate Ajar Switch C478
    • Disconnect: SJB C2280c
      NOTE: Make sure the liftgate is closed.
    • Measure the resistance between the SJB C2280c-16, circuit CPL58 (GY/OG), harness side and ground.
      • Fig 6: Measuring Resistance
      GF0023513Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C13.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  13. C13 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. CLEAR the DTCs. REPEAT the self-test.
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