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Old 10-29-2009, 01:43 PM   #1
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Default Auto-start controlling heated seats

I was wondering if there way anyway to hard-wire a switch for my heated seats to turn on when I turn my autostart on. It'* a 2003 Bonneville SLE. The heated seat control is under the climate controls and on both sides of the trac button. I can get a screenshot of the wiring diagram if needed.

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Old 10-29-2009, 04:40 PM   #2
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You could wire a 12 VDC source direct to the heating elements with an in-line switch, but I would not recommend it.

The switches in the console do not supply power to the elements, they merely signal the seat heater control module what setting has been selected. If you bypass the seat heater control module you will lose two important safety features. There is a thermistor in the seat that tells the control module if the seat temperature is too high, which shuts off power. There is also a link from the body control module to the heater control module that cyles the seat heaters on and off if vehicle power is low, and shuts the seat heaters off when vehicle power drops below a certain point.

Seat heating systems are designed to bring the seating surface up to temperature in a very short period of time. I would leave it set up as is.
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Old 11-02-2009, 01:14 PM   #3
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that makes sense, there wouldnt be a way i could put in a 12v PLC to control it? I probably should just take it in and have it done at a shop.. thanks for the input!
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Old 11-02-2009, 01:25 PM   #4
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Let us know if someone figures out how to do this for you. It would be nice to know how they do it.
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