I have a 2003 Chevy Silverado 2500HD. When I

Mary, 2003 Chevrolet Silverado 2500HD suspension and steering diagrams. Check the attached links,instruction and guides, Good luck
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well you can't just pull the plug or unhook the seat from below,, the motor for adjusting the seat seems to be on the same circuit, unless your the only one who drives the vehicle, then you could yank the circuit breaker for the seats , what it sounds like to me with the heat issue is that you have a shorted element in the seat itself, and they are pretty lame as heaters go, Chevy sells a replacement which consists of a piece of tape with the element inside of it, and you have to remove the covers and weave this replacement through the seat,, Ive only done one, but you could see all the burn spots on it,

check plug under seat look for corrsived prongs in plug

See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they dont; work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue.

try to jump the starter selinoid

same bulb but 2 seperate elements. wiring diagram u should be able to obtain from your local auto parts store like autozone(preferred)

your problem was the electric seat motor. I had the same thing happen on passenger side while driving,fortunately smelled smoke, looked under seat and pulled motor wire loose.

Identical thing here with my '03 Surburban LT.

Sound like the door actuators are bad if you take it somewhere take it to a dealer auto body shop Its Cheaper

The most likely cause is the seat heater elements, they either have excessive resistance or are open - id recommended replacing both driver side element - upper and lower