There is a bulletin at gm site in regard to this problem. check the wiring near the parking brake ratchet teeth for damage, also check under the drivers seat where the seat bottoms out wiring could be pinched there or the drivers side door sill.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A rel='nofollow' href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1734688&psdid=1058&evc=sm#ss1-1734688">Condition/Concern:
There have been reports of either the MBEC 1 or LBEC 1 maxi fuse blown intermittently and unable to locate a short to ground.
<A rel='nofollow' href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1734688&psdid=1058&evc=sm#ss2-1734688">Recommendation/Instructions:
If after normal diagnostics no shorts can be found the below items have been reported:
Note: Replacement of the circuit breaker is needed if a short to ground is found on circuit 3, 1240, 1340, or 1440. 
ID # 1242532). If no shorts are located on circuit 642, inspect
circuits 1340 after the "Rt Door" circuit breaker 25 amp and circuit
1440 after the "Seat" circuit breaker 30 Amp (SI Document ID # 1242687).
• Inspect circuit 1340 shorted to ground near the right I/P support bracket.
• Inspect circuit 1340 or 1440 shorted to ground on the support bracket for the I/P relay block.
• Inspect circuit 1440 shorted to ground under or in either front seat.
• Inspect circuit 1440 shorted to ground near the parking brake pedal assembly. The short may only occur if the parking brake pedal is depressed.
- Inspect circuit 1240 shorted to ground near the parking brake pedal assembly. The short may only occur if the parking brake pedal is depressed.
Please
follow this diagnostic or repair process thoroughly and complete each
step. If the condition exhibited is resolved without completing every
step, the remaining steps do not need to be performed.
SOURCE: 2004 ford explorer power windows inoperable
you may want to check the wires between the door and the body....they have been known to break also
SOURCE: 1999 Cadillac Deville Driver side power seat not working
No fuse.These seats are protected with relays and a seat module.The module is under the drivers seat.There are 3 connectors and it would be hard to check all these wires for power to the motors.First look under the seat and make sure none of the connectors came apart under the seat by something that might have been left or rolled under it.The 2 main ones you can check are the connector 2 terminal C and connector 3 terminal A.C is a black wire which is ground and A is a red wire which is the feed power wire.Connector 2 is green and 3 is black.If the ground and power wires are good then you could have a bad drivers seat module.What I would do is go to the salvage yard and find a used module to try.Good luck.
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