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Pinpoint Test P: The Power Lumbar Is Inoperative - Passenger

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. P1 CHECK FOR VOLTAGE TO THE SEAT CONTROL SWITCH 
    • Ignition OFF.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger Seat Side Air Bag Module C313.
    • Disconnect: Seat Control Switch C3190.
      • 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 .
    • Measure the voltage between seat control switch C3190-5, circuit SBB31 (WH/RD), harness side and ground.
      Fig 1: Checking Voltage To Seat Control Switch
      G06134172Courtesy 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. If not OK, REFER to the Wiring Diagrams information to identify the possible causes of the circuit short. TEST the system for normal operation.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. P2 CHECK FOR GROUND TO THE SEAT CONTROL SWITCH 
    • Measure the resistance between seat control switch C3190-3, circuit GD126 (BK/WH), harness side and ground.
      Fig 2: Measuring Resistance Between Seat Control Switch C3190-3, Circuit GD126 (BK/WH), Harness Side And Ground
      G06063176Courtesy 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.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. P3 CHECK FOR VOLTAGE TO THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3190.
    • Disconnect: Power Lumbar Motor C3216.
      • NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
      Fig 3: Checking Voltage To Lumbar Motor
      G06063343Courtesy of FORD MOTOR CO.
    • Measure the voltage between power lumbar motor C3216-1, circuit CPS20 (VT), harness side and power lumbar motor C3216-2, circuit CPS21 (WH/OG), harness side.
    • Operate the seat control switch in both directions.
    • Is the voltage greater than 10 volts when the seat control switch is operated and 0 volt in the rest position? 
      • Yes:  INSTALL a new power lumbar assembly. REFER to Lumbar Assembly  . TEST the system for normal operation.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      • No:  GO to  P4.
  4. P4 CHECK THE LUMBAR MOTOR CIRCUITS 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.
      • seat control switch C3190-10, circuit CPS21 (WH/OG), harness side and ground.
      Fig 4: Checking Lumbar Motor Circuits For Short To Ground
      G06399803Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms  .
      • Yes:  GO to  P5.
      • No:  REPAIR the circuit(s). TEST the system for normal operation.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. P5 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between:
      • seat control switch C3190-7, circuit CPS20 (VT), harness side and power lumbar motor C3215-1, circuit CPS20 (VT), harness side.
      • seat control switch C3190-10, circuit CPS21 (WH/OG), harness side and power lumbar motor C3215-2, circuit CPS21 (WH/OG), harness side.
      Fig 5: Checking Lumbar Motor Circuits For Open
      G06259273Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
      • Yes:  INSTALL a new seat control switch. REFER to Seat Control Switch  . TEST the system for normal operation.

        DISCONNECT the battery ground cable. 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.

        DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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