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Pinpoint Test A: No Communication With The Vehicle Security Module

  1. A1 CHECK THE VOLTAGE TO THE VEHICLE SECURITY MODULE 
    • Key in OFF position.
    • Disconnect: Vehicle Security Module C3203e.
    • Key in ON position.
    • Measure the voltage between the vehicle security module C3203e-3, circuit 645 (WH/LB), harness side and ground; and between the vehicle security module C3203e-1, circuit 456 (DG/OG), harness side and ground.
      Fig 1: Checking Voltage To Vehicle Security Module
      G03911173Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to A2.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  2. A2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Vehicle Security Module C3203d.
    • Measure the resistance between the vehicle security module C3203d-14, circuit 1205 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Vehicle Security Module C3203d-14, Circuit 1205 Harness Side And Ground
      G03911174Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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