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Pinpoint Test A: No Communication With The Driver Seat Module (DSM)

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK NGS TESTER COMMUNICATION TO THE DDM 
    • Using the results from the DATA LINK DIAGNOSTICS test, check for communication to the DDM.
    • Does the diagnostic tool communicate with the DDM? 
  2. A2 CHECK CIRCUITS 29-AH80 (OG/WH) AND 30-AH80 (RD) FOR VOLTAGE 
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
    NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Key in OFF position.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in the General Procedures .
    • Disconnect: Driver Seat Side Air Bag Module C316.
    • Connect: Restraint System Diagnostic Tool 418-133 or 501-097 to Driver Seat Side Air Bag Module C316.
    • Connect: Battery Ground Cable.
      WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
    • Disconnect: DSM C341b.
    • Disconnect: DSM C341c.
    • Measure the voltage between DSM C341c-10, circuit 29-AH80 (OG/WH), harness side and ground; and between DSM C341b-4, circuit 30-AH80 (RD), harness side and ground.
      Fig 1: Checking Circuits 29-AH80 (OG/WH) And 30-AH80 (RD) For Voltage
      G03999220Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to  A3.
    • No  : REPAIR the circuit in question. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  3. A3 CHECK CIRCUIT 31-AH80 (BK) AND 91-AH80 (BN/WH) FOR AN OPEN 
    • Measure the resistance between the DSM C341b-3, circuit 31-AH80 (BK), harness side and ground; and between DSM C341c-2, circuit 91-AH80 (BN/WH), harness side and ground.
    Fig 2: Checking Circuit 31-AH80 (BK) And 91-AH80 (BN/WH) For Open
    G03999372Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms?
    • Yes  : REFER to MODULE COMMUNICATIONS NETWORK .
    • No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316. CONNECT driver seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
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