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2004 GMC Sierra drivers side seat heater turnes on and off by itself

Heated seat (back only) started coming on by itself, I have unhooked the door control unit but it did not help, (now I can't turn it back off) thinking maybe just unhooking the back seat heater or pulling the fuse, as far as the fuse havent been able to locate fuse (need true labeling) can't find anything that says seat heater.

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  • Cars & Trucks Master
  • 21,873 Answers

The seats are powered by a 30amp breaker which includes the circuits for the power motors.
The signal from the control switch goes to a door module then to a memory seat module, then to the heater elements.
It may be easier to disconnect the heating element for now, repairs will need a shop manual to test and trace the circuits.

Posted on Apr 29, 2013

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Posted on Jan 02, 2017

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  • 8 Answers

SOURCE: 2004 GMC Envoy driver's side heated seat quit

I have the same problem except the back of mine works but the bottom doesn't. Passenger side is fine. Let me know what you find out if you could.

Posted on Oct 07, 2011

  • 6 Answers

SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem

your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps

Posted on Sep 09, 2009

Testimonial: "Very good information. THANKS!"

  • 14 Answers

SOURCE: 2005 gmc sierra 2500hd heated seat turns off

you have a couple of problems first of all your drivers sd=ide heated heat pad is probably faulty, for your heating problem you may have to get the hvac doors recalibrated.

Posted on Oct 05, 2009

  • 312 Answers

SOURCE: heated, power seats not working

Check wiring under the seat. Frequent habit of pushing things under the seat such as flashlights and tools etc and moving the seat forward and back sometimes pulls wires or breaks them.

Posted on Apr 07, 2010

weekspena
  • 375 Answers

SOURCE: 2006 gmc sierra 2500 duramax, Heater blower motor

could be the blower motor relay orthe blower motor resistor

Posted on Jan 11, 2011

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1 Answer

Seat heater comes on by itself in 2004 yukon denali


Heated Seat Components
The heated seat system consists of the following components:
• Driver and passenger heated seat switches
• Driver and passenger seat back heater elements
• Driver and passenger seat cushion heater elements
• Driver and passenger seat back temperature sensors
• Driver seat module
• Driver door module
• Passenger door module
When there are modules involved in the operation of any componet that's acting up , the module's electronic's could be the culprit ! But without testing who's to say what the problem could be !
I would have it check for DTC'S
DTC B2425 or B2430
The driver and passenger seat heaters are controlled by the driver seat module. Power is supplied to the driver seat cushion and back heater elements through individual voltage supply circuits. Power is supplied to the passenger seat cushion and back heater elements through a common voltage supply circuit. All of the driver and passenger seat heater elements are grounded by the driver seat module through individual low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the driver seat module in order to control the seat temperatures by regulating the current flow through the heater elements.
DTC B2435 or B2440
The driver seat module relies on inputs from thermistors installed in the driver and passenger seat backs to control heated seat temperatures. The thermistors are 2-wire sensors supplied with a 5-volt referenced signal circuit and low reference circuit from the driver seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to decrease as the seat back temperatures rise.
Install a scan tool.
Start the engine.
Turn the heated seat ON.
With a scan tool, observe the Heated Seat Sensor parameter in the data list for the driver seat module.
Does the scan tool indicate that the heated seat sensor parameter is within the specified range?
0.078-4.94 V

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It's probably not the fuse but instead the heating element in the seat ! There go bad all the time . CHEVY GMC SEAT HEATER TROUBLESHOOTING

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2005 gmc sierra 2500hd heated seat turns off


you have a couple of problems first of all your drivers sd=ide heated heat pad is probably faulty, for your heating problem you may have to get the hvac doors recalibrated.

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1 Answer

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