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Pinpoint Test H: The Power Lumbar Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
NOTE: The air bag warning indicator illuminates when the restraints control module (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.
  1. H1 CHECK CIRCUIT 566 (DG) FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Driver Seat Side Air Bag C367
    • Connect restraint system diagnostic tool 418-133 to driver seat side air bag C367.
    • Disconnect: Lumbar Control Switch C361
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
      • Fig 1: Checking Circuit 566 (DG) For Open
      GF0014764Courtesy of FORD MOTOR CO.
    • Measure the voltage between lumbar control switch C361-4, circuit 566 (DG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H2.
    2. NO  : VERIFY bussed electrical center (BEC) fuse 14 (30A) is OK. If OK, 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 C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. H2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
      Fig 2: Checking Circuit 1205 (BK) For Open
      GF0000055Courtesy of FORD MOTOR CO.
    • Measure the resistance between lumbar control switch C361-2, circuit 1205 (BK), harness side and ground; and between lumbar control switch C361-8, circuit 1205 (BK), harness side and ground.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  H3.
    2. 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 C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. H3 CHECK THE LUMBAR MOTOR 
    • Connect: Lumbar Control Switch C361
    • Disconnect: Power Lumbar Motor C366
      • Fig 3: Checking Lumbar Motor
      GF0021354Courtesy of FORD MOTOR CO.
    • Measure the voltage between power lumbar motor C366-1, circuit 1097 (BN), harness side and power lumbar motor C366-2, circuit 1094 (PK), harness side.
    • Operate the power lumbar control switch in both directions.
    • Is the voltage greater than 10 volts in both directions? 
    1. YES  : INSTALL a new power lumbar assembly. REFER to Lumbar Assembly . TEST the system for normal operation.

      DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  H4.
  4. H4 CHECK CIRCUITS 1094 (PK) AND 1097 (BN) FOR A SHORT TO GROUND 
    • Disconnect: Lumbar Control Switch C361
      • Fig 4: Checking Circuit 1094 (PK) And Circuit 1097 (BN) For Short To Ground
      GF0014766Courtesy of FORD MOTOR CO.
    • Measure the resistance between lumbar control switch C361-3, circuit 1097 (BN), harness side and ground; and between lumbar control switch C361-7, circuit 1094 (PK), harness side and ground.
    • Are the resistances greater than 10,000 ohms. 
    1. YES  : Go to  H5.
    2. 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 C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. H5 CHECK CIRCUITS 1094 (PK) AND 1097 (BN) FOR AN OPEN 
      Fig 5: Checking Circuits 1094 (PK) & 1097 (BN) For An Open
      GF0046209Courtesy of FORD MOTOR CO.
    • Measure the resistance between power lumbar control switch C361-3, circuit 1097 (BN), harness side and power lumbar motor C366-1, circuit 1097 (BN), harness side; and between lumbar control switch C361-7, circuit 1094 (PK), harness side and power lumbar motor C366-2, circuit 1094 (PK), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : INSTALL a new lumbar control switch. REFER to Lumbar Control Switch . TEST the system for normal operation.

      DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. 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 C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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