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Pinpoint Test I: The Power Lumbar Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 CHECK CIRCUIT 566 FOR AN OPEN 
    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 portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect driver seat safety belt buckle pretensioner C3133.
    • Connect restraint system diagnostic tool 418-133 to driver seat safety belt buckle pretensioner C3133.
      • 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.
    • Connect the battery ground cable.
    • Disconnect: Lumbar Switch C361.
    • Measure the voltage between lumbar control switch C361 pin 2, circuit 566 (DG), harness side and ground.
      Fig 1: Measuring Voltage Between Lumbar Control Switch C361 Pin 2, Circuit 566 (DG) And Ground
      G03880252Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to I2.
    • No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  2. I2 CHECK CIRCUIT 1205 FOR AN OPEN 
    • Measure the resistance between lumbar control switch C361 pin 3, circuit 1205 (BK), harness side and ground; and between lumbar control switch C361 pin 6, circuit 1205 (BK), harness side and ground.
      Fig 2: Check Circuit 1205 For An Open
      G03931736Courtesy of FORD MOTOR CO.
    • Are both the resistances less than 5 ohms? 
    • Yes  : GO to I3
    • No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  3. I3 CHECK THE LUMBAR MOTOR 
    • Connect: Lumbar Switch C361.
    • Disconnect: Lumbar Motor C366.
    • Measure the voltage between power lumbar motor C366 pin 1, circuit 1097 (BN), harness side and power lumbar motor C366 pin 2, circuit 1094 (PK), harness side.
      Fig 3: Check Lumbar Motor
      G03953813Courtesy of FORD MOTOR CO.
    • Operate the power lumbar control switch in both directions.
    • Is the voltage greater than 10 volts in both directions? 
    • Yes  : INSTALL a new power lumbar assembly. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : GO to I4.
  4. I4 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR A SHORT TO GROUND 
    • Disconnect: Lumbar Switch C361.
    • Measure the resistance between lumbar control switch C361 pin 7, circuit 1094 (PK), harness side and ground; and between lumbar control switch C361 pin 1, circuit 1097 (BN), harness side and ground.
      Fig 4: Checking Circuit 1094 (PK) And Circuit 1097 (BN) For A Short To Ground
      G03931738Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms. 
    • Yes  : GO to I5.
    • No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  5. I5 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR AN OPEN 
    • Measure the resistance between lumbar control switch C361 pin 1, circuit 1097 (BN), harness side and power lumbar motor C366 pin 1, circuit 1097 (BN), harness side; and between lumbar control switch C361 pin 7, circuit 1094 (PK), harness side and power lumbar motor C366 pin 2, circuit 1094 (PK), harness side.
      Fig 5: Checking Circuit 1094 (PK) And Circuit 1097 (BN) For An Open
      G03953815Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : INSTALL a new lumbar control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133. CONNECT driver seat safety belt buckle pretensioner C3133. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
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