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Pinpoint Test H: The Heated Seat Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE HEATED SEAT SYSTEM FOR VOLTAGE 
    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. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    NOTE: The air bag warning lamp illuminates when the 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.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect the affected seat safety belt buckle pretensioner C3133 (driver) or C3134 (passenger).
    • Connect restraint system diagnostic tool 418-133 to the affected seat safety belt buckle pretensioner C3133 (driver) or C3134 (passenger).
      • 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.
    • Connect the battery ground cable.
    • Disconnect: Driver Seat Cushion Heater C364a/Passenger Seat Cushion Heater C334a.
    • Key in ON position.
    • Press the heated seat switch on the affected seat and turn the heated seat ON.
    • Measure the voltage between driver seat cushion heater C364a pin 1, or passenger seat cushion heater C334a pin 1, circuit 1064 (YE/LB), harness side and ground.
      Fig 1: Measuring Voltage Between Driver Seat Cushion Heater C364a Pin 1, Or Passenger Seat Cushion Heater C334a Pin 1, Circuit 1064 (YE/LB) And Ground
      G03953805Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  H4.
    • No  : GO to H2.
  2. H2 CHECK CIRCUIT 298 (VT/OG) 
    • Key in OFF position.
    • Disconnect: Driver Heated Seat Switch C320/Passenger Heated Seat Switch C321.
    • Key in ON position.
    • Measure the voltage between driver heated seat switch C320, or passenger heated seat switch C321 pin 1, circuit 298 (VT/OG), harness side and ground.
      Fig 2: Measuring Voltage Between Driver Heated Seat Switch C320, Or Passenger Heated Seat Switch C321 Pin 1, Circuit 298 (VT/OG) And Ground
      G03953806Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to H3.
    • No  : REPAIR circuit 298 (VT/OG). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  3. H3 CHECK CIRCUIT 1064 (YE/LB) 
    • Key in OFF position.
    • Measure the resistance between driver heated seat switch C320, or passenger heated seat switch C321 pin 2, circuit 1064 (YE/LB), harness side and driver seat cushion heater C364a, or passenger seat cushion heater C334a pin 1, circuit 1064 (YE/LB), harness side.
      Fig 3: Measuring Resistance Between Driver Heated Seat Switch C320 And Driver Seat Cushion Heater C364a
      G03953807Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  4. H4 CHECK CIRCUIT 1205 (BK) 
    • Key in OFF position.
    • Disconnect: Driver Seat Back Heater C365a/Passenger Seat Back Heater C335a.
    • Measure the resistance between driver seat back heater C365a, or passenger seat back heater C335a pin 2, circuit 1205 (BK), harness side and ground.
      Fig 4: Measuring Resistance Between Driver Seat Back Heater C365a And Ground
      G03953808Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H5.
    • No  : REPAIR circuit 1205 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  5. H5 CHECK THE SEAT CUSHION HEATER 
    • Measure the resistance between driver seat cushion heater C364a, or passenger seat cushion heater C334a pin 1, circuit 1064 (YE/LB), component side and pin 2, circuit 1066 (GY/LB), component side.
      Fig 5: Checking Seat Cushion Heater
      G03953809Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.8 and 1.3 ohms? 
    • Yes  : GO to H6.
    • No  : INSTALL a new seat cushion heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
  6. H6 CHECK THE SEAT BACK HEATER 
    • Measure the resistance between driver seat back heater C365a, or passenger seat back heater C335a pin 1, circuit 1066 (GY/LB), component side and pin 2, circuit 1205 (BK), component side.
      Fig 6: Checking Seat Back Heater
      G03953810Courtesy of FORD MOTOR CO.
    • Is the resistance between 0.8 and 1.3 ohms? 
    • Yes  : REPAIR circuit 1066 (GY/LB) of the seat wiring harness. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • No  : INSTALL a new seat back heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. CONNECT driver seat safety belt buckle pretensioner C3133 or passenger seat safety belt buckle pretensioner C3134. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
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