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Pinpoint Test O: The Power Lumbar Is Inoperative - Driver

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. O1 CHECK CIRCUIT SBB15 (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 C3297.
    • Measure the voltage between seat control switch C3297-5, circuit SBB15 (WH/RD), harness side and ground.
      Fig 1: Checking Circuit SBB15 (WH/RD) For Open
      G04683280Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to O2.

    No  : VERIFY battery junction box (BJB) fuse 15 (10A) 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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. O2 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN 
    • Measure the resistance between seat control switch C3297-3, circuit GD126 (BK/WH), harness side and ground.
      Fig 2: Checking Circuit GD126 (BK/WH) For Open
      G04683281Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to O3.

    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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. O3 CHECK THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3297.
    • Disconnect: Power Lumbar Motor C3215.
    • For power seat, measure the voltage between power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side.
      Fig 3: Checking Lumbar Motor
      G04683282Courtesy 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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to O4.

  4. O4 CHECK CIRCUIT CPS19 (GY/VT) AND CIRCUIT CPS18 (BN/GN) FOR A SHORT TO GROUND 
    • Disconnect: Seat Control Switch C3297.
    • Measure the resistance between seat control switch C3297-7, circuit CPS18 (BN/GN), harness side and ground; and between seat control switch C3297-10, circuit CPS19 (GY/VT), harness side and ground.
      Fig 4: Checking Circuit CPS19 (GY/VT) And Circuit CPS18 (BN/GN) For Short To Ground
      G04683283Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms. 

    Yes  : GO to O5.

    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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. O5 CHECK CIRCUIT CPS19 (GY/VT), CIRCUIT CPS18 (GN/RD) AND CPS18 (BN/GN) FOR AN OPEN 
    • Measure the resistance between seat control switch circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side; and between seat control switch C3297-10, circuit CPS19 (GY/VT), harness side and power lumbar motor C3215-L, circuit CPS19 (GY/VT), harness side.
      Fig 5: Checking Circuit CPS19 (GY/VT), Circuit CPS18 (GN/RD) And CPS18 (BN/GN) For Open
      G04683284Courtesy 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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. 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 driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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