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Pinpoint Test S: The Power Lumbar Is Inoperative - Passenger

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the restraints control module (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.
  1. S1 CHECK CIRCUIT SBB61 (GY/RD) FOR AN OPEN 
    • 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: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
      • 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.
    • Disconnect: Seat Control Switch C3026
    • Measure the voltage between seat control switch C3026-5 , circuit SBB61 (GY/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  S2.
    2. NO  : VERIFY battery junction box (BJB) fuse 61 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. S2 CHECK CIRCUIT GD145 (BK/BU) FOR AN OPEN 
      Fig 1: Measuring Resistance Between Seat Control Switch C3026-3, Circuit GD145 (BK/BU) & Ground
      GF0016323Courtesy of FORD MOTOR CO.
    • Measure the resistance between seat control switch C3026-3, circuit GD145 (BK/BU), harness side and ground.
    • 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. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. S3 CHECK THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3026
    • Disconnect: Power Lumbar Motor C3216
      • Fig 2: Measuring Voltage Between Power Lumbar Motor C3216-1 & C3216-2, Circuit CPS20 (VT) & CPS21 (WH/OG)
      GF0030781Courtesy of FORD MOTOR CO.
    • While operating the seat control switch in both directions, 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.
    • Is the voltage greater than +10 volts in one direction and greater than -10 volts in the other direction? 
    1. YES  : INSTALL a new power lumbar assembly. REFER to Lumbar Assembly - Power . TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : Go to  S4.
  4. S4 CHECK CIRCUIT CPS20 (VT) AND CIRCUIT CPS21 (WH/OG) FOR A SHORT TO GROUND 
    • Disconnect: Seat Control Switch C3026
      • Fig 3: Measuring Resistance Between Seat Control Switch C3026-10 & C3026-7, Circuit CPS20 (VT) & CPS21 (WH/OG)
      GF0021355Courtesy of FORD MOTOR CO.
    • Measure the resistance between seat control switch C3026-10, circuit CPS20 (VT), harness side and ground; and between seat control switch C3026-7, circuit CPS21 (WH/OG), harness side and ground.
    • 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. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. S5 CHECK CIRCUIT CPS20 (VT) AND CIRCUIT CPS21 (WH/OG) FOR AN OPEN 
      Fig 4: Measuring Resistance Between Seat Control Switch C3026-10 & C3026-7, Circuit CPS20 (VT) & CPS21 (WH/OG)
      GF0030782Courtesy of FORD MOTOR CO.
    • Measure the resistance between seat control switch C3026-10, circuit CPS20 (VT), harness side and power lumbar motor C3216-1, circuit CPS20 (VT), harness side; and between seat control switch C3026-7, circuit CPS21 (WH/OG), harness side and power lumbar motor C3216-2, circuit CPS21 (WH/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : INSTALL a new seat control switch. REFER to Seat Control Switch - Front . TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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