Pinpoint Test B: No Communication with the Driver Seat Module (DSM): Testing

B1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Key in OFF position.
- Disconnect: DSM C341a.
- Disconnect: DSM C341c.
- Measure the voltage between the DSM C341a-2, circuit 566 (DG), harness side and ground; and between the DSM C341c-1, circuit 956 (OG/LG), harness side and ground.
  
  Fig 1: Measuring Voltage Between DSM C341A-2 Circuit 566 (DG)
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to B2.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
B2 CHECK THE DSM GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between the DSM C341a-1, circuit 1205 (BK), harness side and ground; and between the DSM C341c-13, circuit 1203 (BK/LB), harness side and ground.
  
  Fig 2: Measuring Resistance Between DSM C341A-1 Circuit 1205 (BK)
  Courtesy of FORD MOTOR CO.
- Are the resistances 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.