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

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. 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: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES article.
  1. H1 CHECK THE SJB KEYCODE PID 
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Observe the KEYCODE PID. Read and record the 5-digit factory set code.
    • Enter the 5-digit factory set code on the keyless entry keypad.
    • Does the driver door unlock? 
    1. YES  : The system is operating as designed. INFORM the customer of the correct system operation.
    2. NO  : Go to  H2.
  2. H2 RETRIEVE THE RECORDED SJB DTCs FROM THE SELF-TEST 
    • Check for recorded SJB DTCs from the self-test.
    • Is DTC B2A26 recorded? 
    1. YES  : Go to  H3.
    2. NO  : Go to  H5.
  3. H3 REPEAT THE SJB SELF-TEST 
    • Key in OFF position.
    • Disconnect: Keyless Entry Keypad C500
    • Key in ON position.
    • Clear the DTCs, then repeat the SJB self-test.
    • Is DTC B2A26 recorded? 
    1. YES  : Go to  H4.
    2. NO  : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad .
  4. H4 CHECK CIRCUITS CPK29 (GY/BU), CPK30 (VT/GN) AND CPK31 (YE/GN) FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280c
    • Measure the resistance between the SJB, harness side and ground as follows:
      Connector-Pin Circuit
      C2280c-5 CPK29 (GY/BU)
      C2280c-18 CPK30 (VT/GN)
      C2280c-6 CPK31 (YE/GN)
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  H10.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  5. H5 CHECK THE SJB KEY_PAD PID 
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Press each keyless entry keypad button while observing the KEY_PAD PID.
    • Does the PID display the correct values? 
    1. YES  : Go to  H10.
    2. NO  : Go to  H6.
  6. H6 CHECK CIRCUIT GD133 (BK) FOR AN OPEN 
    • Disconnect: Negative Battery Cable
    • Disconnect: Keyless Entry Keypad C500
    • Measure the resistance between the keyless entry keypad C500-5, circuit GD133 (BK), harness side and ground.
      • Fig 1: Measuring Resistance
      GF0045489Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. H7 CHECK THE KEYLESS ENTRY KEYPAD 
    • Connect: Negative Battery Cable
    • Connect a fused jumper wire between the keyless entry keypad harness side, while monitoring the SJB PID (KEY_PAD) as follows:
      Keyless Entry Keypad Connector-Pin/ Circuit Keyless Entry Keypad Connector-Pin/ Circuit SJB PID (KEY_PAD) Value
      C500-1
      CPK29 (GY/BU)      		 C500-5
      GD133 (BK)      		 1/2
      C500-3
      CPK30 (VT/GN)      		 C500-5
      GD133 (BK)      		 7/8
      C500-4
      CPK31 (YE/GN)      		 C500-5
      GD133 (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  H8.
  8. H8 CHECK CIRCUITS CPK29 (GY/BU), CPK30 (VT/GN) AND CPK31 (YE/GN) FOR AN OPEN 
    • Disconnect: SJB C2280c
    • Measure the resistance between the SJB, harness side and the keyless entry keypad, harness side as follows:
      SJB Connector-Pin Circuit Keyless Entry Keypad Connector-Pin
      C2280c-5 CPK29 (GY/BU) C500-1
      C2280c-18 CPK30 (VT/GN) C500-3
      C2280c-6 CPK31 (YE/GN) C500-4
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  H9.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  9. H9 CHECK CIRCUITS CPK29 (GY/BU), CPK30 (VT/GN) AND CPK31 (YE/GN) FOR A SHORT TO EACH OTHER 
    • Measure the resistance between the SJB, harness side as follows:
      SJB Connector-Pin Circuits SJB Connector-Pin
      C2280c-5 CPK29 (GY/BU) and CPK30 (VT/GN) C2280c-18
      C2280c-5 CPK29 (GY/BU) and CPK31 (YE/GN) C2280c-6
      C2280c-18 CPK30 (VT/GN) and CPK31 (YE/GN) C2280c-6
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  H10.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  10. H10 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.
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