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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1239 (Interior Lighting System) >> Diagnostic Tests >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test A: The Courtesy Lamps Are Inoperative >> Pinpoint Test A: The Courtesy Lamps Are Inoperative

Pinpoint Test A: The Courtesy Lamps Are 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. A1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB self-test.
    • Is DTC B2021, B2250 or B2554 present? 
    1. YES  : For DTC B2021, go to  A2.
    2. For DTC B2550, go to  A4.
    3. For DTC B2554, go to  A6.
    4. NO  : Go to  A10.
  2. A2 CHECK THE INTERIOR LAMP (DTC B2021) 
    • Key in OFF position.
    • Disconnect: Overhead Console C930
    • Disconnect: Overhead Console (With Convertible Top) C9013
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test
      • NOTE: DTC B2254 may be present and should be ignored.
    • Clear the SJB DTCs and REPEAT the self-test.
    • Is DTC B2021 retrieved again? 
    1. YES  : Go to  A3.
    2. NO  : INSTALL a new interior lamp. Clear the SJB DTCs. REPEAT the self-test.
  3. A3 CHECK CIRCUIT 54 (LG/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280f
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Overhead Console C930-4 & Ground
      GF0016158Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the voltage between the overhead console C930-4, circuit 54 (LG/YE), harness side and ground.
      • Fig 2: Measuring Voltage Between Overhead Console C9013-4 & Ground
      GF0001393Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the voltage between the overhead console C9013-4, circuit 54 (LG/YE), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  A11.
  4. A4 CHECK THE INTERIOR LAMP (DTC B2250) 
    • Key in OFF position.
    • Disconnect: Overhead Console C930
    • Disconnect: Overhead Console (With Convertible Top) C9013
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test
      • NOTE: DTC B2254 may be present and should be ignored.
    • Clear the SJB DTCs and REPEAT the self-test.
    • Is DTC B2050 retrieved again? 
    1. YES  : Go to  A5.
    2. NO  : INSTALL a new interior lamp. Clear the SJB DTCs. REPEAT the self-test.
  5. A5 CHECK CIRCUIT 53 (BK/LB) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280f
      • Fig 3: Measuring Resistance Between Overhead Console C930-5 & Ground
      GF0016159Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the resistance between the overhead console C930-5, circuit 53 (BK/LB), harness side and ground.
      • Fig 4: Measuring Resistance Between Overhead Console C9013-5 & Ground
      GF0001394Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the resistance between the overhead console C9013-5, circuit 53 (BK/LB), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. A6 CHECK CIRCUIT 53 (BK/LB) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Overhead Console C930
    • Disconnect: Overhead Console (With Convertible Top) C9013
    • Key in ON position.
      • Fig 5: Measuring Voltage Between Overhead Console C930-5 & Ground
      GF0016160Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the voltage between the overhead console C930-5, circuit 53 (BK/LB), harness side and ground.
      • Fig 6: Measuring Voltage Between Overhead Console C9013-5 & Ground
      GF0001395Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the voltage between the overhead console C9013-5, circuit 53 (BK/LB), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A8.
    2. NO  : Go to  A7.
  7. A7 CHECK CIRCUIT 53 (BK/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280f
      • Fig 7: Measuring Resistance Between Overhead Console C930-5 & SJB C2280F-26
      GF0016161Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the resistance between the overhead console C930-5, circuit 53 (BK/LB), harness side and the SJB C2280f-26, circuit 53 (BK/LB), harness side.
      • Fig 8: Measuring Resistance Between Overhead Console C9013-5 & SJB C2280F-26
      GF0001396Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the resistance between the overhead console C9013-5, circuit 53 (BK/LB), harness side and the SJB C2280f-26, circuit 53 (BK/LB), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  8. A8 CHECK THE GROUND CIRCUIT TO THE OVERHEAD CONSOLE 
      Fig 9: Measuring Voltage Between Overhead Console C930-5 & Overhead Console C930-4
      GF0016162Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the voltage between the overhead console C930-5, circuit 53 (BK/LB), harness side and the overhead console C930-4, circuit 54 (LG/YE), harness side.
      • Fig 10: Measuring Voltage Between Overhead Console C9013-5 & Overhead Console C930-4
      GF0001398Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the voltage between the overhead console C9013-5, circuit 53 (BK/LB), harness side and the overhead console C930-4, circuit 54 (LG/YE), harness side.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new interior lamp. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  A9.
  9. A9 CHECK CIRCUIT 54 (LG/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280f
      • Fig 11: Measuring Resistance Between Overhead Console C930-4 & SJB C2280F-25
      GF0016163Courtesy of FORD MOTOR CO.
    • For vehicles without a convertible top, measure the resistance between the overhead console C930-4, circuit 54 (LG/YE), harness side and the SJB C2280f-25, circuit 54 (LG/YE), harness side.
      • Fig 12: Measuring Resistance Between Overhead Console C9013-4 & SJB C2280F-25
      GF0001399Courtesy of FORD MOTOR CO.
    • For vehicles with a convertible top, measure the resistance between the overhead console C9013-4, circuit 54 (LG/YE), harness side and the SJB C2280f-25, circuit 54 (LG/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  10. A10 CHECK THE SJB DOOR AJAR AND THE DIMMER SWITCH PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Monitor the SJB door ajar switch PIDs (D_DR_SW, P_DR_SW) while opening and each door.
    • Monitor the SJB dome lamp switch PID (DOMELM_SW) while operating the dimmer switch in the interior lamp ON positions.
    • Do the SJB door ajar and dome lamp switch PIDs correspond? 
    1. YES  : Go to  A11.
    2. NO  : For a door ajar switch, go to Pinpoint Test B .
    3. For the dome lamp switch, go to Pinpoint Test C .
  11. A11 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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