2004 Tahoe...8 way power seat on the driver's side doesn't retain it's position in memory when the key is turned off. It moves all the way toward the windshield. Any ideas?

You may have memory seats, your owners manual should have some info on setting memory.
I looked at wiring diagram for your power seat, driver side, it showed three seat motors depending on what your trying to do? If the seat won't move forward and back, have to check horizontal seat motor. The fact that one of the seat motors is working tells me voltage and ground to the seat switch are ok. Could be a seat motor or the control switch problem? I'd have to do testing to decide which?

Principles of Operation
The driver seat module (DSM) is on the controller area network (CAN) communication network. To support several vehicle subsystems, the module permits intermodule and diagnostic tool communications.
The DSM controls the memory driver seat and the passenger memory power exterior mirror. This passenger memory power exterior mirror feature allows the driver to program personalized mirror positions. Once the driver stores a mirror position, the driver can recall the setting by pressing the corresponding memory switch or by using a programmed remote keyless entry (RKE) transmitter. For additional information, refer to Section 501-10 .

How to Diagnose Controller Area Network CAN

Driver Seat Module - Memory Seat
The power driver seat, power outside rear view mirrors and power adjustable pedals are controlled by the driver seat module (DSM) only when the vehicle is equipped with the programmable/recall memory option. The DSM is located on the driver seat track.
This system allows automatic positioning of the driver seat to 2 programmable positions.

• A power driver seat position can be stored at any time. The driver must move the seat to the desired position using the driver seat switch assembly. The driver must then depress the memory SET switch which activates the memory SET switch light emitting diode (LED). Within 5 seconds (before the LED goes out), the driver must select a memory position. Memory 1 is selected by depressing memory switch 1. Memory 2 is selected by depressing memory switch 2.
• If no memory switch input is received within the 5-second time limit, the operation is aborted and the memory seat position switch (set switch) LED is turned OFF. This also occurs if one of the following inputs is received during the 5-second programming limit:
  • Driver seat control switch
  • Memory seat position switch (set switch)
  • Power adjustable pedal switch

A programmed seat position can only be recalled when the transmission selector is in PARK or NEUTRAL with the ignition switch in the RUN position. A position may be programmed at any time.

Easy Entry/Easy Exit
The driver power seat easy entry/easy exit feature can be enabled/disabled. Refer to Section 418-01 or the owner's literature.

This may need to be done with a scan tool

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? 1:44
https://www.youtube.com/watch?v=EDh-0rs5Fjo
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

I have read that there may be an issue with the seat motor control unit. Check with your dealer on a recall or tech bulletin. It may need to be reprogrammed to work properly.
Although this is for a 2004 it may carry over to the 2009 model:
Document ID# 1694588
2004 Chevrolet Tahoe - 4WD


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Subject: Memory Seat May Not Return to Requested Position (Reprogram Driver Seat Module) #04-08-50-016C - (08/12/2005)



Models: 2003-2005 Cadillac Escalade, Escalade ESV, Escalade EXT

2003-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003-2005 GMC Sierra, Yukon, Yukon XL, Yukon Denali

All with Seat FRT, Individual (Non BKT) (RPO AN3)

2003-2005 HUMMER H2 with Seat, Front Bucket Deluxe (RPO AR9)


This bulletin is being revised to update the correction information. Please discard Corporate Bulletin Number 04-08-50-016B (Section 08 -- Body and Accessories).

Condition:
Some customers may comment that with repeated cycling of the memory seat between the 'exit' and one of the 'presets', the position of the seat may "creep" forward or rearward out of expected adjustment.

Cause:
There is a coding deficiency in the software for the memory seat module.

Correction:
Technicians are to reprogram the driver seat module with an updated software calibration. The previous bulletin stated to use a service calibration that was released with TIS satellite data update version 4.5. Feedback has proved that calibration to be ineffective in eliminating the memory seat creep condition. An updated service calibration was released with TIS satellite data update version 6.5 available June 13, 2005. This new calibration has additional memory seat creep protection. As always, make sure your Tech 2® is updated with the latest software version.

Important: After programming is complete, move the seat all the way rearward and down, then bump the seat slightly forward and up. This position will be just off the end of travel hard stops. Reset both memory seat exit positions at this position. Having the seat set at just off the hard stops will aid in reducing the creep condition.

Warranty Information
Labor Operation
Description
Labor Time

N9524*
Driver Seat Module - Reprogram
0.4 hr


*This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 1694588
2004 Chevrolet Tahoe

disconnect the battery then disconnect the wires underneath the seat then undo the four mounting bolts then your seat should lift out

more than likely it is the power seat switch itself try pushing on theforward button really hard onc and if it now moves get a new switch

The limited edition brings memory setting for mirrors and seats, it recognizes which key are you putting in the ignition and puts the saved setting accordingly to that driver's key. That is the reason your seat keeps moving. You need to reprogram the seat position for that key. Good luck

it sound like you need to replace seat control switch

Make sure red button is in up position
His key:
Insert key

Move seat all the forward, then all the back with key off to clear the memory
move seat to middle
turn key to on
turn key to off
turn key to on.
Move seat to desired position then hold down button 1 until you hear a chime.
Remove key

Her key

repeat procedure for button 2

what fuse controls the drivers side power seats 2004 tahoe