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Pinpoint Test S: The Power Lumbar Is Inoperative - Passenger: Overview

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  1. S1 CHECK CIRCUIT 30-AH46 (RD) 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 seat mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the air bag system must be depowered. Refer to AIR BAG RESTRAINT SYSTEMS .
    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 AIR BAG RESTRAINT SYSTEMS .
    • Disconnect: Passenger Seat Side Air Bag Module C314.
    • Connect: Restraint System Diagnostic Tool 418-133 or 501-097 to Passenger Seat Side Air Bag Module C314.
    • 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: Passenger Seat Lumbar Control Switch C331.
    • Key in ON position.
    • Measure the voltage between the passenger seat lumbar control switch C331-5, circuit 30-AH46 (RD), harness side and ground.
      Fig 1: Measuring Voltage Between Passenger Seat Lumbar Control Switch C331-5, Circuit 30-AH46 (RD), Harness Side And Ground
      G03203797Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to S2.
    2. No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  2. S2 CHECK CIRCUIT 31-AH46 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between passenger seat lumbar control switch C331 -3, circuit 31 -AH46 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Passenger Seat Lumbar Control Switch C331 -3, Circuit 31 -AH46 (BK), Harness Side And Ground
      G03203798Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to S3.
    2. No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  3. S3 CHECK THE PASSENGER SEAT LUMBAR MOTOR 
    • Connect: Passenger Seat Lumbar Control Switch C331.
    • Disconnect: Passenger Seat Lumbar Motor C336.
    • Measure the voltage between passenger seat lumbar motor C336-2, circuit 32-AH23 (WH/BU), harness side and passenger seat lumbar motor C336-1, circuit 33-AH23 (YE/BU), harness side.
      Fig 3: Measuring Voltage Between Passenger Seat Lumbar Motor C336-2, Circuit 32-AH23 (WH/BU), Harness Side
      G03203799Courtesy of FORD MOTOR CO.
    • Operate the passenger seat lumbar control switch in both directions.
    • Is the voltage greater than 10 volts? 
    1. Yes  : INSTALL a new driver seat lumbar motor. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
    2. No  : GO to S4.
  4. S4 CHECK CIRCUIT 32-AH45 (WH/BU) AND 33-AH45 (YE/BU) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Passenger Seat Lumbar Control Switch C331.
    • Measure the resistance between passenger seat lumbar control switch C331 -1, circuit 32 -AH45 (WH/BU), harness side and ground; and between passenger seat lumbar control switch C331 -4, circuit 33-AH45 (YE/BU), harness side and ground.
      Fig 4: Measuring Resistance Between Passenger Seat Lumbar Control Switch C331 -1, Circuit 32 -AH45 (WH/BU), Harness Side And Ground
      G03203800Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to S5.
    2. No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  5. S5 CHECK CIRCUIT 32-AH45 (WH/BU) FOR AN OPEN 
    • Measure the resistance between passenger seat lumbar control switch C331 - 1, circuit 32-AH45 (WH/BU), harness side and passenger seat lumbar motor C336-2, circuit 32-AH45 (WH/BU), harness side.
      Fig 5: Measuring Resistance Between Passenger Seat Lumbar Control Switch C331 - 1, Circuit 32-AH45 (WH/BU), Harness Side
      G03203801Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to S6.
    2. No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  6. S6 CHECK CIRCUIT 33-AH45 (YE/BU) FOR AN OPEN 
    • Measure the resistance between passenger seat lumbar control switch C331 -4, circuit 33-AH45 (YE/BU), harness side and passenger seat lumbar motor C336- 1, circuit 33-AH45 (YE/BU), harness side.
      Fig 6: Measuring Resistance Between Passenger Seat Lumbar Control Switch C331 -4, Circuit 33-AH45 (YE/BU), Harness Side
      G03203802Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new passenger seat lumbar control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
    2. No  : REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C314. CONNECT passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
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