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Pinpoint Test I: The Heated Seats Are Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 CHECK THE HEATED SEAT INDICATORS 
    • Key in ON position.
    • Operate both heated switches on.
    • Do one or both heated seat switch indicators illuminate? 
    1. YES  : If both indicators illuminate, go to  I2

      For driver seat only, go to Pinpoint Test J . For passenger seat only, go to Pinpoint Test K .

    2. NO  : Key OFF and DISASSEMBLE as necessary to disconnect all of the HVAC module electrical connectors. WAIT one minute to allow the system to reset and RECONNECT the electrical connectors. RETEST the system. If the heated seat indicator still does not illuminate, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
  2. I2 CHECK THE HEATED SEAT POWER CIRCUITS 
    • Key in OFF position.
    • Disconnect: Heated Seat Relay Driver or Passenger
    • Key in ON position.
      • Fig 1: Checking Heated Seat Power Circuits
      GF0000056Courtesy of FORD MOTOR CO.
    • Measure the voltage at heated seat relay socket pin 1, circuit 1048 (LB/WH), and ground; and between pin 3, circuit 1048 (LB/WH), and ground.
    • Are both voltages greater than 10 volts? 
    1. YES  : VERIFY the climate control system is operating correctly, REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
    2. NO  : VERIFY bussed electrical center (BEC) fuse 66 (25A) is OK. If OK, REPAIR circuit 1048 (LB/WH). TEST the system for normal operation.
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