I had the same issue on m dads 2005 Z71. It wound up being a bolt fell in the track of the seat and skint a wire and grounded out. resulting in a blown fuse and seats and all windows but the driver window quit working. Also check the connectors under the seat, some of them can be seperated just enough to cause a power problem
Testimonial: "thanks for the help, but the fuse is not blown; no power to the fuse"
SOURCE: power seats do not work
IT HAS TO HAVE A POWER CORD COMING FROM THE SEAT UNDER THE BOTTOM OF THE SEAT TO MAKE IT WORK SEE IF IT IS PLUG UP
SOURCE: 2000 Blazer. No power to the orange wire for
The orange wire is the power wire for both seats.It gets its power from the power seat circuit braker (20 amp) located at the body relay block.It is located behind left side of dash near fuse block. Remove circuit braker and check for power in body relay cavity that you pulled the relay out of if power is on one side change circuit braker and if no power on either side then you have a bad main fuse near battery or under hood in main fuse block. Joe ASE Master Tech
SOURCE: Power seat has lost power, right side power
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 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 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.
ā¢ Inspect circuit 1340 shorted to ground near the right I/P support bracket.
ā¢ Inspect circuit 1340 or 1440 shorted to ground on the support bracket for the I/P relay block.
ā¢ Inspect circuit 1440 shorted to ground under or in either front seat.
ā¢ 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.
There are two fuse boxes. A baqttery junction box under the hood on the drivers side and one inside on drivers side. Good luck.
Fuse/Relay
Location
Fuse Amp
Rating
Power Distribution Box
Description
1 60A** I/P Fuse Panel
2 40A** Blower Motor Relay
3 50A** 4 Wheel Anti-Lock Brake System
(4WABS) Module
4 30A** Power Windows, Power Moon
Roof, Power Seat
5 50A** Ignition Switch, Starter Relay
6 20A** Transfer Case Relay
7 - Not Used
8 20A** Air Suspension
9 40A** Air Suspension
10 30A** PCM Power Relay
1 10A* A/C Relay
2 30A* Heated Seats
3 30A* Heated Backlight
4 15A* Fog Lamps and Daytime Running
Lamps
5 4 3 2 1
10 9 8 7 6
12 11 10 9
8 7 6 5
4 3 2 1
15 14 13
2 1 1
9
6
10
8
7
5
4
1
3 2
175
MEGAFUSE
Roadside emergencies
197
Fuse/Relay
Location
Fuse Amp
Rating
Power Distribution Box
Description
5 - Not Used
6 10A* Powertrain Control Module
7 30A* 4 Wheel Anti-Lock System
(4WABS) Module
8 15A* Rear Wiper Motor
9 20A* Fuel Pump Relay and RAP
Module
10 15A* Horn Relay
11 15A* Parklamps Relay and Mainlight
Switch
12 30A* Mainlight Switch and
Multifunction Switch
13 15A* Heated Oxygen Sensor, EGR
Vacuum Regulator, EVR Solenoid,
Camshaft Position (CMP) Sensor,
Canister Vent Solenoid
14 30A* Generator/Voltage Regulator
15 - Not Used
1 - Wiper Park Relay
2 - A/C Relay
3 - Wiper High/Low Relay
4 - PCM Power Relay
5 - Fuel Pump Relay
6 - Starter Relay
7 - Horn Relay
8 - Rear Wipe Down Relay
9 - Blower Motor Relay
10 - Rear Wipe Up Relay
1 - Not Used
1 - DRL Diode
2 - Electronic Engine Controls Diode
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