Pinpoint Test C: No Communication With The Lighting Control Module (LCM)

C1 CHECK THE LCM FOR VOLTAGE
- Key in OFF position.
- Disconnect: LCM C2145c.
- Key in ON position.
- Measure the voltage between LCM C2145c pin 12, circuit 195 (TN/WH), harness side and ground; and between LCM C2145c pin 1, circuit 54 (LG/YE), harness side and ground.
  
  Fig 1: Checking LCM For Voltage
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to C2.
- No : REPAIR the power supply. CLEAR the DTCs. REPEAT the self-test.
C2 CHECK LCM GROUND CIRCUITS FOR AN OPEN
- Key in OFF position.
- Measure the resistance between LCM C2145c pin 10, circuit 676 (PK/OG), harness side and ground; and between LCM C2145c pin 15, circuit 676 (PK/OG), harness side and ground.
  
  Fig 2: Checking LCM Ground Circuits For An Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to diagnose the communication network.
- No : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.