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Pinpoint Test D: All Door Locks Are Inoperative From One Switch

  1. D1 CHECK THE SWITCH OPERATION IN THE LOCK AND UNLOCK POSITIONS 
    • Press lock and unlock on the door lock control switch while observing the results.
    • Are both the lock and unlock positions inoperative? 
    • Yes  : Go to  D4.
    • No  : If inoperative for lock, Go to  D2.

      If inoperative for unlock, Go to  D3.

  2. D2 CHECK CIRCUIT 31S-AA85 (BK/RD) FOR VOLTAGE 
    • Disconnect: Inoperative Driver Door Lock Control Switch C505 or Inoperative Passenger Door Lock Control Switch C605.
    • Measure the voltage between the inoperative door lock control switch connector and ground.
      • Measure the voltage between the driver door lock control switch C505 pin 7, circuit 31S-AA85A (BK/RD), harness side and ground.
      • Measure the voltage between the passenger door lock control switch C605 pin 7, circuit 31S-AA85B (BK/RD), harness side and ground.
      Fig 1: Measuring Voltage Between Passenger Door Lock Control Switch C605 Pin 7, Circuit 31S-AA85B (BK/RD) And Ground
      G03953054Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new door lock control switch. CLEAR the DTCs. REPEAT the self-test.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. D3 CHECK CIRCUIT 31S-AA39 (BK/YE) FOR VOLTAGE 
    • Disconnect: Inoperative Driver Door Lock Control Switch C505 or Inoperative Passenger Door Lock Control Switch C605.
    • Measure the voltage between the inoperative door lock control switch connector and ground.
      • Measure the voltage between the driver door lock control switch C505 pin 1, circuit 31S-AA39A (BK/YE), harness side and ground.
      • Measure the voltage between the passenger door lock control switch C605 pin 1, circuit 31S-AA39B (BK/YE), harness side and ground.
      Fig 2: Measuring Voltage Between Passenger Door Lock Control Switch C605 Pin 1, Circuit 31S-AA39B (BK/YE) And Ground
      G03953055Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new door lock control switch. CLEAR the DTCs. REPEAT the self-test.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. D4 CHECK GROUND TO THE DOOR LOCK CONTROL SWITCH 
    • Disconnect: Inoperative Driver Door Lock Control Switch C505 or Inoperative Passenger Door Lock Control Switch C605.
    • Measure the resistance between the inoperative door lock control switch connector and ground.
      • Measure the resistance between the driver door lock control switch C505 pin 2, circuit 31-AA34 (BK), harness side and ground.
      • Measure the resistance between the passenger door lock control switch C605 pin 2, circuit 31-AA39 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Passenger Door Lock Control Switch C605 Pin 2, Circuit 31-AA39 (BK) And Ground
      G03953056Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new door lock control switch. CLEAR the DTCs. REPEAT the self-test.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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