LEMON Manuals: Even more car manuals for everyone
Home >> Lincoln >> 2010 >> MKZ FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (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 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.
NOTE: Make sure the interior lamp switches are in the DOOR position.
  1. A1 CHECK THE SJB DTCs FROM BOTH THE CONTINUOUS AND THE ON-DEMAND SELF-TESTS 
    • Use the recorded results from the SJB continuous and on-demand self-test.
    • Are any SJB DTCs recorded? 
    1. YES  : For DTC B2A35, go to  A2.

      For DTC B2A36, go to  A6.

      For all other DTCs, REFER to DTC Charts .

    2. NO  : Go to  A4.
  2. A2 CHECK THE OPERATION OF THE DEMAND LIGHTING 
    • Operate the demand lighting function on any courtesy lamp.
    • Does the courtesy lamp illuminate with the demand lighting function? 
    1. YES  : Go to  A3.
    2. NO  : REPAIR circuit GD182 (BK/GY) for an open. TEST the system for normal operation.
  3. A3 CHECK CIRCUIT VLN33 (GY/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280a
    • Connect a fused (10A) jumper wire between the SJB C2280a-9, circuit VLN33 (GY/VT), harness side and battery positive.
      • Fig 1: Checking Circuit For Open
      GF0023503Courtesy of FORD MOTOR CO.
    • Do the courtesy lamps illuminate? 
    1. YES  : VERIFY the SJB fuse 9 (15A) is OK. Go to  A7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK THE DIMMER SWITCH 
    • Key in OFF position.
    • Disconnect: Dimmer Switch C2065
    • Key in ON position.
    • Measure the voltage between the dimmer switch C2065-2, circuit CLN27 (WH/BN), harness side and ground.
      • Fig 2: Checking Circuit For Voltage
      GF0023504Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new dimmer switch. REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION article. TEST the system for normal operation.
    2. NO  : Go to  A5.
  5. A5 CHECK CIRCUIT CLN27 (WH/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Measure the resistance between the SJB C2280b-36, circuit CLN27 (WH/BN), harness side and ground.
      • Fig 3: Checking Circuit For Short To Ground
      GF0023505Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK CIRCUIT VLN33 (GY/VT) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280a
    • Disconnect: All Courtesy Lamps
    • Measure the resistance between the SJB C2280a-9, circuit VLN33 (GY/VT), harness side and ground.
      • Fig 4: Measuring Resistance
      GF0042727Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR the circuit. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  7. A7 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. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
scientia non olet · About LEMON Manuals