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Pinpoint Test K: The Heated Seat Is Inoperative - Driver, Does Not Operate In Low

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE 
    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.
    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 a supplemental restraint system (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:
    • Key in OFF position.
    • Disconnect: Driver Heated Seat Module C359.
    • Measure the resistance between driver heated seat module C359-11, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
      Fig 1: Measuring Resistance Between Driver Heated Seat Module C359-11, Circuit 1255 And Ground
      G04585915Courtesy of FORD MOTOR CO.
    • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed? 

    Yes  : INSTALL a new heated seat module. 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 C315. CONNECT driver seat side air bag module C315. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to K2.

  2. K2 CHECK CIRCUIT 1255 (WH/RD) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Driver Heated Seat Switch C538.
    • Measure the resistance between driver heated seat switch C538-2, circuit 1255 (WH/RD), harness side and driver heated seat module C359-11, circuit 1255 (WH/RD), harness side; and between driver heated seat switch C538-2, circuit 1255 (WH/RD), harness side and ground.
      Fig 2: Checking Circuit 1255 (WH/RD) For An Open Or Short To Ground
      G04585916Courtesy of FORD MOTOR CO.
    • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground? 

    Yes  : GO to K3.

    No  : REPAIR circuit 1255 (WH/RD). 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 C315. CONNECT driver seat side air bag module C315. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. K3 CHECK CIRCUIT 1255 (WH/RD) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between driver heated seat module C359-11, circuit 1255 (WH/RD), harness side and ground.
      Fig 3: Measuring Voltage Between Driver Heated Seat Module C359-11, Circuit 1255 And Ground
      G04585917Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes  : REPAIR circuit 1255 (WH/RD). 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 C315. CONNECT driver seat side air bag module C315. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new heated seat 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 C315. CONNECT driver seat side air bag module C315. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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