Electrical problem on 2003 SilveradoHD 2500 LT

KevinsBar · December 2, 2005

I would appreciate any help you guys can give me. Just the other day I noticed both my Passenger front and rear windows would not open. When I press the down button for the rear window I hear a click, like the motor is getting some sort of power, but won't go down. Then I realized that Neither my Drivers or passengers electric seats work and the seat heaters do not work either. The driver side windows both work though. I tested the wire to the motor on the Passenger side and got no reading. I also checked the 25A fuse for the windows and it was good. What else might be the Problem, maybe a wiring harness? Please help, truck is just out of waranty-- Figures! Thanks guys.

GM-Tech · December 2, 2005

Both right doors and everything for the seats runs off of two circuit breakers in the relay box, which is against the bulkhead (firewall) inside the vehicle, to the left of the steering column. There's a black plastic cover over it with a long plastic nut in the middle. There's also to tabs that have to be released to get this cover off.

BUT, it's highly unlikely that two different circuit breakers have a problem, so you need to first go to what supplies them. Look at the MBEC fuse in the underhood fuse box. This is a 50 amp fuse that supplies those circuits.

KevinsBar · December 7, 2005

Thanks For your help GM-TECH, It was the MBEC 1 Fuse. Have a Great holiday, Kevin.

sallysman · November 24, 2006

I would appreciate any help you guys can give me. Just the other day I noticed both my Passenger front and rear windows would not open. When I press the down button for the rear window I hear a click, like the motor is getting some sort of power, but won't go down. Then I realized that Neither my Drivers or passengers electric seats work and the seat heaters do not work either. The driver side windows both work though. I tested the wire to the motor on the Passenger side and got no reading. I also checked the 25A fuse for the windows and it was good. What else might be the Problem, maybe a wiring harness? Please help, truck is just out of waranty-- Figures! Thanks guys.

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Had a similiar problem and traced it to a bad window switch. Everything else was OK

sallysman