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Pinpoint Test G: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Remote Keyless Entry and Alarm for schematic and connector information.

Normal Operation 

The driver door module (DDM) monitors for a ground signal on reference circuits 78 (LB/YE), 79 (LG/RD) and 121 (YE/BK) for the keyless entry keypad. When an individual keypad button is pressed, an individual or a combination of the reference circuits are connected to ground. The DDM then determines which button was pressed based on which circuit(s) has a ground signal. The keypad is grounded through circuit 57 (BK). Once the DDM determines that the 5-digit personal entry code, or the factory set 5-digit entry code has been entered on the keypad, the DDM then energizes the driver door unlock relay to unlock the driver door.

To unlock all the doors, the 3/4 button must be pressed within 5 seconds of the 5-digit code being entered.

To release the luggage compartment lid, the 5/6 button must be pressed within 5 seconds of the 5-digit code being entered. For vehicles with a power luggage compartment lid, press the 5/6 button again to close the lid.

To lock all the doors, the 5-digit code does not need to be entered. Press the 7/8 and 9/0 buttons at the same time.

The keyless entry keypad has an anti-scan feature to help prevent theft. If a valid 5-digit code is not entered within 7 attempts (35 consecutive button presses), the keyless entry keypad will go into anti-scan. In anti-scan mode, the keypad illumination will flash and all input will be ignored except for pressing the 7/8 and 9/0 buttons, which will lock all doors.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST G: THE DOORS DO NOT LOCK/UNLOCK USING THE KEYLESS ENTRY KEYPAD 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 CHECK THE DDM KEYCODE PID 
    • Enter the following diagnostic mode on the diagnostic tool: DDM DataLogger
    • Observe the DDM PID (KEYCODE). Read and record the 5-digit factory set entry code.
    • Enter the 5-digit factory set entry code on the keyless entry keypad.
    • Do the doors unlock? 
    1. YES  : The system is operating as designed. INFORM the customer of the correct system operation.
    2. NO  : Go to  G2.
  2. G2 RETRIEVE THE RECORDED DDM DTCs FROM THE SELF-TEST 
    • Check for recorded DDM DTCs from the self-test.
    • Is DTC B2695, B2696, or B2697 recorded? 
    1. YES  : Go to  G3.
    2. NO  : Go to  G5.
  3. G3 REPEAT THE DDM SELF-TEST 
    • Disconnect: Keyless Entry Keypad C500
    • Clear the DTCs, then repeat the DDM self-test.
    • Is DTC B2695, B2696, or B2697 recorded? 
    1. YES  : Go to  G4.
    2. NO  : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad . CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK CIRCUITS 78 (LB/YE), 79 (LG/RD) AND 121 (YE/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: DDM C501a
    • Measure the resistance between the keypad, harness side and ground as follows:
      Connector-Pin Circuit
      C500-1 78 (LB/YE)
      C500-3 79 (LG/RD)
      C500-7 121 (YE/BK)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  G10.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. G5 CHECK THE DDM KEY_PAD PID 
    • Enter the following diagnostic mode on the diagnostic tool: DDM DataLogger
    • Press each keyless entry keypad button while observing the (KEY_PAD) PID.
    • Does the PID display the correct values? 
    1. YES  : Go to  G10.
    2. NO  : Go to  G6.
  6. G6 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Negative Battery Cable
    • Disconnect: Keyless Entry Keypad C500
      • Fig 1: Measuring Resistance
      GF0044990Courtesy of FORD MOTOR CO.
    • Measure the resistance between the keyless entry keypad C500-6, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : CONNECT the negative battery cable. Go to  G7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. G7 CHECK THE KEYLESS ENTRY KEYPAD 
    • Connect a fused (5A) jumper wire between the keyless entry keypad harness side, while monitoring the DDM PID (KEY_PAD) as follows:
      Keyless Entry Keypad Connector-Pin/Circuit Keyless Entry Keypad Connector-Pin/Circuit DDM PID (KEY_PAD) Value
      C500-1
      78 (LB/YE)      		 C500-6
      57 (BK)      		 1/2
      C500-3
      79 (LG/RD)      		 C500-6
      57 (BK)      		 7/8
      C500-7
      121 (YE/BK)      		 C500-6
      57 (BK)      		 9/0
    • Does the PID display the correct values? 
    1. YES  : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .
    2. NO  : Go to  G8.
  8. G8 CHECK CIRCUITS 78 (LB/YE), 79 (LG/RD) AND 121 (YE/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DDM C501a
    • Measure the resistance between the DDM, harness side and the keyless entry keypad, harness side as follows:
      DDM Connector-Pin Keyless Entry Keypad Connector-Pin Circuit
      C501a-7 C500-1 78 (LB/YE)
      C501a-2 C500-3 79 (LG/RD)
      C501a-3 C500-7 121 (YE/BK)
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  G9.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  9. G9 CHECK CIRCUITS 78 (LB/YE), 79 (LG/RD) AND 121 (YE/BK) FOR A SHORT TO EACH OTHER 
    • Measure the resistance between the keypad, harness side as follows:
      Keypad Connector-Pin Circuits Keypad Connector-Pin
      C500-1 78 (LB/YE) and 79 (LG/RD) C500-3
      C500-1 78 (LB/YE) and 121 (YE/BK) C500-7
      C500-3 79 (LG/RD) and 121 (YE/BK) C500-7
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  G10.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  10. G10 CHECK FOR CORRECT DDM OPERATION 
    • Disconnect all the DDM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the DDM 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 DDM. 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.
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