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Pinpoint Test F: The Luggage Compartment Lamp Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. 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. F1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB self-test.
    • Is DTC B1084 present? 
    1. YES  : Go to  F2.
    2. NO  : Go to  F6.
  2. F2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Luggage Compartment Lamp C428
      • Fig 1: Measuring Resistance Between Trunk Lamp C428-2 & Ground
      GF0016171Courtesy of FORD MOTOR CO.
    • Measure the resistance between the luggage compartment lamp C428-2, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. F3 CHECK CIRCUIT 707 (WH/YE) FOR VOLTAGE 
    • Key in ON position.
      • Fig 2: Measuring Voltage Between Luggage Compartment Lamp C428-1 & Ground
      GF0016172Courtesy of FORD MOTOR CO.
    • Measure the voltage between the luggage compartment lamp C428-1, circuit 707 (WH/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new luggage compartment lamp. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  F4.
  4. F4 CHECK CIRCUIT 707 (WH/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280e
      • Fig 3: Measuring Resistance Between Luggage Compartment Lamp C428-1 & Ground
      GF0016173Courtesy of FORD MOTOR CO.
    • Measure the resistance between the luggage compartment lamp C428-1, circuit 707 (WH/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. F5 CHECK CIRCUIT 707 (WH/YE) FOR AN OPEN 
      Fig 4: Measuring Resistance Between Luggage Compartment Lamp C428-1 & SJB C2280E-15
      GF0016174Courtesy of FORD MOTOR CO.
    • Measure the resistance between the luggage compartment lamp C428-1, circuit 707 (WH/YE), harness side and the SJB C2280e-15, circuit 707 (WH/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F8.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. F6 CHECK THE SJB LUGGAGE COMPARTMENT LID AJAR SWITCH 
    • Key in OFF position.
    • Disconnect: Luggage Compartment Lid Ajar Switch C429
    • Key in ON position.
    • Does the luggage compartment lamp turn on? 
    1. YES  : INSTALL a new luggage compartment lid ajar switch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . TEST the system for normal operation.
    2. NO  : Go to  F7.
  7. F7 CHECK CIRCUIT 1351 (TN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280c
      • Fig 5: Measuring Resistance Between Luggage Compartment Lid Ajar Switch C429-1 & Ground
      GF0016175Courtesy of FORD MOTOR CO.
    • Measure the resistance between the luggage compartment lid ajar switch C429-1, circuit 1351 (TN), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. F8 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 . 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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