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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1394 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test N: The Power Lumbar is Inoperative - Passenger >> Pinpoint Test N: The Power Lumbar Is Inoperative - Passenger

Pinpoint Test N: The Power Lumbar Is Inoperative - Passenger

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the correct restraints control module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. N1 CHECK CIRCUIT SBB31 (WH/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 article.
    • Disconnect the passenger seat side air bag 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 article.
    • Measure the voltage between seat control switch C3190-5 , circuit SBB31 (WH/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  N2.
    2. NO  : VERIFY battery junction box (BJB) fuse 31 (30A) is OK. If OK, 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 article.

  2. N2 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN 
      Fig 1: Measuring Resistance
      GF0016323Courtesy of FORD MOTOR CO.
    • Measure the resistance between seat control switch C3190-3, circuit GD139 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  N3.
    2. 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 article.

  3. N3 CHECK THE LUMBAR MOTOR 
    • Connect: Seat Control Switch C3190
    • Disconnect: Power Lumbar Motor C3216
      • Fig 2: Checking Circuit For Voltage
      GF0021354Courtesy of FORD MOTOR CO.
    • For power seat, 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 in both directions? 
    1. 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 article.

    2. NO  : Go to  N4.
  4. N4 CHECK CIRCUITS CPS20 (VT) AND CPS21 (YE/BK) FOR A SHORT TO GROUND 
    • Disconnect: Seat Control Switch C3190
      • Fig 3: Measuring Resistance
      GF0021355Courtesy of FORD MOTOR CO.
    • 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 (WH/OG), harness side and ground.
    • Are the resistances greater than 10,000 ohms. 
    1. YES  : Go to  N5.
    2. 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 article.

  5. N5 CHECK CIRCUITS CPS20 (VT), CPS20 (WH/OG) AND CPS21 (YE/BK) FOR AN OPEN 
      Fig 4: Checking Circuit For Open
      GF0021356Courtesy of FORD MOTOR CO.
    • Measure the resistance between seat control switch C3190-7, 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.
    • Are the resistances less than 5 ohms? 
    1. 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 article.

    2. 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 article.

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