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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Handles, Locks, Latches And Entry Systems (F250-F550)) >> Diagnostic Tests >> Locks, Latches and Entry Systems - Module Controlled >> Pinpoint Tests >> Pinpoint Test J: The Keyless Entry Keypad Illumination Is Inoperative >> Pinpoint Test J: The Keyless Entry Keypad Illumination Is Inoperative

Pinpoint Test J: The Keyless Entry Keypad Illumination Is Inoperative

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. J1 CHECK THE KEYLESS ENTRY KEYPAD SWITCH PIDS 
    • Enter the following diagnostic mode on the diagnostic tool: Vehicle Security Module PIDS
    • Press each keyless entry keypad button while viewing vehicle security module KEY_PAD PIDS.
    • Do the PID values agree with the keyless entry keypad button positions? 
    1. YES  : Go to  J2.
    2. NO  : Go to Pinpoint Test F .
  2. J2 CHECK THE VEHICLE SECURITY MODULE OUTPUT FUNCTION 
    • Enter the following diagnostic mode on the diagnostic tool: Vehicle Security Module Active Commands
    • Activate the keyless entry keypad backlighting on and off active commands.
    • Trigger LIGHT ON then OFF.
    • Does the keyless entry keypad backlighting turn on for 2 seconds as commanded? 
    1. YES  : Go to  J5.
    2. NO  : Go to  J3.
  3. J3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Keyless Entry Keypad C500
      • Fig 1: Checking Circuit For Open
      GF0005299Courtesy of FORD MOTOR CO.
    • Measure the resistance between the keyless entry keypad C500-5, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. J4 CHECK CIRCUIT 66 (LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Vehicle Security Module C2113c
      • Fig 2: Checking Circuit For Open
      GF0005300Courtesy of FORD MOTOR CO.
    • Measure the resistance between the keyless entry keypad C500-2, circuit 66 (LB), harness side and the vehicle security module C2113c-6, circuit 66 (LB), harness side; and between the keyless entry keypad C500-2, circuit 66 (LB), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad . TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  5. J5 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION 
    • Key in OFF position.
    • Disconnect all the vehicle security module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the vehicle security module 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 vehicle security module. 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. TEST the system for normal operation.
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