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Pinpoint Test M: The Heated Seats Are Inoperative - Driver And Front Passenger

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. 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. M1 CHECK VOLTAGE TO THE HEATED SEAT MODULE 
    • 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: Passenger Seat Side Air Bag C3227
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3066
    • Disconnect: Heated Seat Module C3304
      • 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.
    • Key in ON position.
    • Measure voltage between:
      • heated seat module C3304-2, circuit CBP35 (YE/GY), harness side and ground.
      • heated seat module C3304-1, circuit SBB22 (BN/RD), harness side and ground.
      • Fig 1: Measuring Voltage
      GF0016377Courtesy of FORD MOTOR CO.
    • Are voltages greater than 10 volts? 
    1. YES  : Go to  M2.
    2. NO  : VERIFY battery junction box (BJB) fuse 22 (20A) and smart junction box (SJB) fuse 35 (10A) are OK. If OK, REPAIR the affected circuit. TEST the system for normal operation.

      If not OK, refer to the Wiring Diagrams Manual to identify the possible causes of the circuit short.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C3227.

      CONNECT passenger seat safety belt buckle pretensioner C3066.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  2. M2 CHECK HEATED SEAT MODULE GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Measure resistance between heated seat module C3304-7, circuit GD148 (BK/YE), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0016378Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    1. YES  : Go to  M3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C3227.

      CONNECT passenger seat safety belt buckle pretensioner C3066.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  3. M3 CHECK TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Passenger Heated Seat Cushion C334
    • Measure resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and passenger seat cushion heater mat C334-3, circuit RHS05 (YE/VT), harness side.
      • Fig 3: Measuring Resistance
      GF0045401Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module - Front . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger seat side air bag module C3227.

      CONNECT passenger seat safety belt buckle pretensioner C3066.

      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 driver seat side air bag C3226 and passenger seat side air bag module C3227.

      CONNECT driver seat safety belt buckle pretensioner C3065 and passenger seat safety belt buckle pretensioner C3066.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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