Driver side power seat won't move

Your seat has two motors under the seat that controls directions also cables that join the motors check those to see if they are moving when you press the switch

If it's a power seat, it's most likely the switch, but possibly the motor. If it moves one direction only, I would say switch. Neither direction would suggest the motor.

No it's not a fuse ! A motor or track problem ! Look for something blocking on that side , paper , food wrapers , what ever your wife stuffs under the seat , kid's toy's !

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? 1:44
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Oct 26, 2010 - Uploaded by automdvideos
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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

Check for a blowin fuse, Defective relay, Loose wires break in one of the wires, Switch could be shot, OR evan the motor has burn,t out,

How to diagnose this problem ? Viewing wiring diagrams to see what all is invovled in these electrical circuit's , check power supply's an ground connection's using a DMM - digital multimeter !
What type power seat's ? does it have memory ,heated an cooled etc ?
Power Seats System Description and Operation
There are 2 options of power seat systems available in full size trucks. The first is 6 way driver and passenger power seats without memory. The second is an 8-way driver seat plus 4-way lumbar with memory, heat and optional cool function. While the passenger has 8-way power seats with heat and optional cool function. For the driver memory seat operation, refer to Memory Seats Description and Operation. Power seats without memory are completely controlled through the power seat switch. Battery voltage is supplied to the power seat switch through the power seat circuit breaker. While the seat adjuster switches are in an inactive state the switch contacts are closed to the power seat switch ground circuit. When a power seat switch is pressed to an active state the switch contact is closed to the battery voltage supply circuit. Each seat adjuster motor is controlled by the power seat switch through 2 motor control circuits. The seat adjuster motors are bidirectional and the direction of adjuster motor rotation is determined by which of the adjuster motor control circuits is switched to battery voltage while the other remains grounded.

If it has memory seat's there is a control module !
Battery voltage is supplied to the driver seat module through a 25 A circuit breaker. The driver seat module supplies the seat adjuster switch assembly with a battery positive reference voltage. While the seat adjuster switches are in an inactive state the switch contacts are closed to the adjuster switch common circuit.
Both right side windows have a seperate power supply from the left side window's ,has RT DOORS circuit breaker CB1 - 25amp. location left instrument panel fuse block . Circuit breaker's very rarely fail .Do the door lock's work on that side of the vehicle ? The windows won't work with their own switche's ?
The DDS controls the passenger window through a GMLAN message to the PDS. When a power window switch is activated in the up or down positions the PDS supplies power and ground to the window motor control circuits to drive the window motor in the required direction. Prior to activating a power window motor the PDS will supply the control circuit with a low current bias voltage in order to determine that a short to ground condition does not exist, and during window motor operation the PDS continues to monitor the motor current to verify proper window motor operation. (Scan tool support is available for this system)
Check PDM fuse 4 15 amp ,this supply's B+ voltage to the DOORLOCK/WINDOW switch passenger side . Check for broken wires inside the flex boot from the body to the passenger door .

either the seat motors out or the seat relays bad check to see if you have power to your motors if so then the motor is defective if not then find the relays and fuse

it souns like the switch on the seat has stopped working or the motor itself has gone bad I would check the switch first

sounds like the motor brushes are about worn out.
Where you actually sitting on the seat when you applied power directly to the motor? If the motor is wearing out, it may work under little or no load but won't work when your weight is on the seat. Will the seat move while hitting the button if you also help push the seat in the direction you are trying to move it? If yes, the motor is weak. Change the motor, check, clean and lube the tracks, if nec., then see if that's better.