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Pinpoint Test P: The Power Lumbar Is Inoperative - Passenger

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. P1 CHECK CIRCUIT SBB31 (WH/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 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 SRS fault.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Key in OFF position.
      • 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.
    • For vehicles equipped with seat side air bags, carry out the following:
    • Disconnect: Seat Control Switch C3190.
    • Measure the voltage between seat control switch C3190-5, circuit SBB31 (WH/RD), harness side and ground.
      Fig 1: Checking Circuit SBB31 (WH/RD) For Open
      G04683285Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to P2.

    No  : VERIFY battery junction box (BJB) fuse 31 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. P2 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN 
    • Measure the resistance between seat control switch C3190-3, circuit GD139 (BK/YE), harness side and ground.
      Fig 2: Checking Circuit GD139 (BK/YE) For Open
      G04683286Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to P3.

    No  : REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. P3 CHECK THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3190.
    • Disconnect: Power Lumbar Motor C3216.
    • For power seat, measure the voltage between power lumbar motor C3216-1, circuit CPS20 (WH/OG), harness side and power lumbar motor C3216-2, circuit CPS21 (YE/BK), harness side.
      Fig 3: Checking Lumbar Motor
      G04683287Courtesy of FORD MOTOR CO.
    • Operate the seat 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.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to P4.

  4. P4 CHECK CIRCUIT CPS20 (VT) AND CIRCUIT CPS21 (YE/BK) FOR A SHORT TO GROUND 
    • Disconnect: Seat Control Switch C3190.
    • Measure the resistance between seat control switch C3190-7, circuit CPS20 (VT), harness side and ground; and between seat control switch C3190-10, circuit CPS21 (YE/BK), harness side and ground.
      Fig 4: Checking Circuit CPS20 (VT) And Circuit CPS21 (YE/BK) For Short To Ground
      G04683288Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms. 

    Yes  : GO to P5.

    No  : REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. P5 CHECK CIRCUIT CPS20 (VT), CIRCUIT CPS20 (WH/OG) AND CIRCUIT CPS21 (YE/BK) FOR AN OPEN 
    • Measure the resistance between seat control switch circuit CPS20 (VT), harness side and power lumbar motor C3215-1, circuit CPS20 (WH/OG), harness side; and between seat control switch C3190-10, circuit CPS21 (YE/BK), harness side and power lumbar motor C3215-2, circuit CPS21 (YE/BK), harness side.
      Fig 5: Checking Circuit CPS20 (VT), Circuit CPS20 (WH/OG) And Circuit CPS21 (YE/BK) For Open
      G04683289Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : INSTALL a new seat control switch. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : REPAIR the circuit. TEST the system for normal operation.

    For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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