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Pinpoint Test F: The Remote Keyless Entry Keypad Illumination Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE KEYPAD SWITCH PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: Vehicle Security Module KEYPAD PIDS.
    • Press each remote keyless entry (RKE) keypad button while viewing the vehicle security module KEYPAD PIDs.
    • Do the PID values agree with the keypad button positions? 
    • Yes  : GO to F2.
    • No  : To diagnose the incorrect RKE keypad PID values, GO to PINPOINT TEST B .
  2. F2 CHECK THE VEHICLE SECURITY MODULE OUTPUT FUNCTION 
    • Enter the following diagnostic mode on the diagnostic tool: Activate the RKE keypad backlighting on and off active commands.
    • Trigger LIGHT ON then OFF.
    • Does the RKE keypad backlighting turn on and off when commanded? 
    • Yes  : GO to  F5.
    • No  : GO to F3.
  3. F3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: RKE Keypad C500.
    • Measure the resistance between the RKE keypad C500-5, circuit 1205 (BK), harness side and ground.
      Fig 1: Measuring Resistance Between RKE Keypad C500-5, Circuit 1205 (BK) And Ground
      G03925930Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to F4.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. F4 CHECK CIRCUIT 66 (LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Vehicle Security Module C3203f.
    • Measure the resistance between the RKE keypad C500-2, circuit 66 (LB), harness side and the vehicle security module C3203f-6, circuit 66 (LB), harness side; and between the vehicle security module C3203f-6, circuit 66 (LB), harness side and ground.
      Fig 2: Checking Circuit 66 (LB) For An Open Or Short To Ground
      G03946121Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the RKE keypad and the vehicle security module and greater than 10,000 ohms between the vehicle security module and ground? 
    • Yes  : INSTALL a new RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD . CLEAR the DTCs. REPEAT the self-test.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. F5 CHECK FOR LATEST LEVEL RKE KEYPAD 
    • Record the complete RKE keypad part number.
    • Is the RKE keypad part number at level 4L2T-14A626? 
  6. F6 CHECK FOR CORRECT RKE KEYPAD OPERATION 
    • Operate the RKE keypad system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : GO to F7.
    • No  : The system is operating correctly at this time.
  7. F7 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION 
    • Disconnect all the vehicle security module connectors.
    • Check for:
      • for corrosion
      • for 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? 
    • Yes  : INSTALL a new vehicle security module. REFER to MULTIFUNCTION ELECTRONIC MODULES . PROGRAM all the RKE transmitters. REFER to REMOTE KEYLESS ENTRY TRANSMITTER PROGRAMMING . INFORM the customer that any transmitters not present will need to be programmed. CLEAR the DTCs. REPEAT the self-test.
    • 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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