I have a 2003 chevy avalanche with heated seats the drivers side works fine but when you try the passenger side it will shut down the drivers side and neither will work. the passenger side will light up for about 1 second.

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DTC B2430 Passenger Seat Heater Circuit

Do you know what DTC'S - diagnostic trouble code's are ?

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.
Your best bet , take it to a qualified repair shop that has diagnostic scanner that can read this code's

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DTC B2430 Passenger Seat Heater Circuit

Do you know what DTC'S - diagnostic trouble code's are ?

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DTC B2435 Driver Seat Back Heater Sensor Circuit

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DTC B2440 Passenger Seat Back Heater Sensor Circuit

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.

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Drivers seat is dead! No power seat or heat. - TheDieselGarage.comwww.thedieselgarage.com/.../96465-drivers-seat-dead-no-power-seat-hea...Mar 22, 2010 - 2003-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2003-2005.... Power seat on driver side didn't work.....passenger did! Neither ...DANG electric seat ' Chevy Truck Forum ' GM Truck Clubwww.gmtruckclub.com/forum/threads/dang-electric-seat.2990/Apr 27, 2006 - 10 posts - ‎7 authors'03 Tahoe My driver seat just stopped, of corse not where I need it, the ... I have a 2003Tahoe and both heated seats are not working. ... with my seat heater on the drivers seat in my 03 Avalanche, it turns ... The driver's side on my Silverado gets way warmer than the passenger side. ... Frozen New Member.Power Seat Problems?? - Tahoe Forum - Che

sounds like a bad switch

Faulty seat heater pad or seat heater switch.I would first check the switch connections and fuse.

I have the same problem with my 03 2500 sierra hd driver seat. lights up for a split second but shuts off. Passenger seat heats fine. Any fix yet?

it sounds like the relay in the module for the heated seats that could be going nuts due to a bad wiring connection. most likely a ground.

There is a service bulletin for this concern from GM.What you will have to do is go to the dealership and they will reprogram the drivers seat module.It should only take a 1/2 hour.The bulletin number is 05-08-50-008.Hope this helps.Good luck.

This is usually a problem with the passenger seat heater control module. It is a common failure on your vehicle. The module is part of the seat cushion.

Just for the heck of it though, check to make sure the wiring to the module under the seat is connected and not loose.

try swopping the feed wires around and run the passenger one over to teh drivers side

There are seperate blowers for the front and rear air. It is most likely either your blower motor or the resistor, both located under the passenger side dash. I got a blower from a salvage yard for $25, But ended up having to get the resister from the dealership for about $130. Hope this helps.