Solution: The heating element in the back was burnt up and shorted out. It causes some kind of little overload or breaker to shut off causing one or both seat heaters to stop working. This seems to be a common problem and is usually the element in the seat back of the driver seat. Show Do heated seats automatically turn off? The longer the seat cushion stays on, the hotter it gets. The thermostat measures the temperature in the cushion. When it reaches a certain temperature, the thermostat sends a signal, automatically turning off the relay until the seat cools down a bit. At that point, the thermostat turns the relay back on again. Why are my heated seats not working?It’s common for the heating element to be the main reason a heated seat isn’t working, simply because the heating wire that warms the seat is delicate and tends to break. If the heating element is partially or totally damaged, you’ll likely need to replace the entire unit. Why would my heated seat not work? Why are my heated seats not working on my car?The problem ended up being a plug on the memory module (the circuit card that remembers all the seat, pedal, steering positions, and seat heat monitor. So the big clues! All the devices are effected, intermittent or no problems until it quits. How can I fix a bad power seat? On the “good” switch, measure across each pin until you see the different combinations of switch positions and “shorts” on the ohmmeter (0 ohms). Re-install the switch to it’s connector and do the same thing on the other switch that controls the “bad” seat. Why does my car seat not go back or forward?Check under the seat for broken wires. Forward and backwards is the function most used and causes the wires to bend back and forth. you may need to remove the seat for inspection or you may be lucky and see the problem just by raising the seat as high as it will go. You can’t post conmments that contain an email address.
CF Beginner Thread Starter Join Date: Jan 2008 Posts: 7 Likes: 0 Received 0 Likes on 0 Posts
 I've searched the forums and can't find the exact answer. I have a 2004 Tahoe Z71. Both front seat heatersstarted shutting off after 30 seconds at the same time. They will come on, heat, then shut off after 30 seconds. The seat and back elements both get hot if you turn it on every 30 seconds. All other electronics in the seats work fine as far as I can tell. The dealer first said the computer fault code was a bad bottom seat element - in both seats that went bad at the same time. I told him the seat bottomsheat fine. They called back and said it was the seat back elements that werebad. Again, I told them that they will heat up if you keep pushing the button. They continued to stick with the diagnosis that the seat back elements were bad and the fix was to replace both seats. They recommended to replace the backs and bottoms. No thanks - since the seats will heat up just fine if you turn them on in 30 second intervals. What is going on? Any ideasor help?
CF Addict Join Date: Aug 2006 Location: Posts: 2,424 Likes: 0 Received 2 Likes on 1 Post
It is probably not a faulty heat element. This problem occurs if there is a fault in the common 5V reference signal. The problem is most often an internal short in the adjustable accelerator pedal sensor, the seat recline position sensor or the heated seat thermistor signal circuit. You can unplug the accelerator pedal position sensor and check if the seats heaters work properly, if they do then replace this sensor. Have your dealer reference GM Document ID # 1864985 for further information on the proper diagnoses and repair of this problem.
CF Beginner Thread Starter Join Date: Jan 2008 Posts: 7 Likes: 0 Received 0 Likes on 0 Posts
Thanks for the help ZX1100F1. Is it difficult to unplug the accelerator pedal position sensor? Can I reach it down around the pedals?
CF Addict Join Date: Aug 2006 Location: Posts: 2,424 Likes: 0 Received 2 Likes on 1 Post
Piece of cake to disconnect: Standing on your head you will see a black and gray plastic wire connector (with several wires going into it) on the accelerator pedal just above your foot pedal, unplug it and test the seat heaters.
CF Beginner Thread Starter Join Date: Jan 2008 Posts: 7 Likes: 0 Received 0 Likes on 0 Posts
OK, I stood on my head, but couldn't find the plug. I started disconnecting several plugs but I don't think I actually found the right one. I never unpluged a connection that disabled the pedal adjustment motor. I did however unplug smething that caused my engine to run terrible and set an engine fault code that took 3 days to clear off. Any more specific instructions for diagnosing the cause of the seat heater problem for a technically inclined but novice mechanic?
CF Beginner Join Date: Feb 2009 Posts: 3 Likes: 0 Received 0 Likes on 0 Posts
Did anyone in this thread ever figure out what the problem was I tried the trouble shooting tips here and have posted a thread that got alomost no response, but my Tahoes driver side heated seat will shut off after 30 seconds, and the passenger side works as long as the driver side is not on. if the driver side is on they both shut off. Someone here has got to know what the answer is.
2004, 2006, accelerator, app, aveo, chevy, heater, pedal, position, seat, seconds, sensor, shuts, stay, tahoe |
Why does my heated seat keep turning off
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