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Home >> Audi >> 2016 >> A6 Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 381 (Handles, Locks, Latches And Entry Systems) >> Diagnosis And Testing >> Handles, Locks, Latches and Entry Systems - With Intelligent Access (IA) >> Pinpoint Tests >> Pinpoint Test AJ : The Keyless Entry Keypad Illumination Is Inoperative >> Pinpoint Test AJ : The Keyless Entry Keypad Illumination Is Inoperative

Pinpoint Test AJ : The Keyless Entry Keypad Illumination Is Inoperative

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. AJ1 CHECK THE KEYLESS ENTRY KEYPAD OPERATION

    • Press the 7/8 and 9/0 buttons simultaneously on the keyless entry keypad.

    Do the doors lock using the keyless entry keypad? 

    Yes  GO to  AJ2.
    No  GO to Pinpoint Test AI .

  2. AJ2 CHECK FOR RFA MODULE DTC B121A:11

    • Ignition ON.
    • Using a diagnostic scan tool, carry out the RFA module self-test.

    Is DTC B121A:11 present? 

    Yes  GO to  AJ3.
    No  GO to  AJ5.

  3. AJ3 CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND

    • Ignition OFF.
    • Disconnect: Keyless Entry Keypad C500 .
    • Ignition ON.
    • Using a diagnostic scan tool, clear the RFA module DTCs.
    • Using a diagnostic scan tool, carry out the RFA module self-test.

    Is DTC B121A:11 still present? 

    Yes  GO to  AJ4.
    No  INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .

  4. AJ4 CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.
    • Disconnect: RFA Module C4392A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C500-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AJ8.
    No  REPAIR the circuit.

  5. AJ5 CHECK THE RFA MODULE OUTPUT USING THE KEYPAD LAMP STATUS (KEYPD_LMP_OS) PID

    • Ignition OFF.
    • Disconnect: Keyless Entry Keypad C500 .
    • Ignition ON.
    • Using a diagnostic scan tool, command the RFA module KEYPD_LMP_OS PID on.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C500-2
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Using a diagnostic scan tool, command the RFA module KEYPD_LMP_OS PID off.

    Is the voltage greater than 11 volts when the PID is commanded on? 

    Yes  GO to  AJ6.
    No  GO to AJ7  .

  6. AJ6 CHECK THE KEYPAD ILLUMINATION GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C500-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .
    No  REPAIR the circuit.

  7. AJ7 CHECK THE RFA MODULE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Disconnect: RFA Module C4392A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C500-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C4392A-10

    Is the resistance less than 3 ohms? 

    Yes  GO to AJ7  .
    No  REPAIR the circuit.

  8. AJ8 CHECK FOR CORRECT RFA MODULE OPERATION

    • Disconnect and inspect all the RFA module connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the RFA module connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK On-Line Automotive Service Information System (OASIS) for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new RFA module. REFER to Multifunction Electronic Modules .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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