2006 GMC Envoy Electrical Problems

Although my first impluse is to tell you to do is to drop the tank and check the fuel pump and level. All GMs have had a terrible record with their instrument panels for 2002-2006, so think back and try to remember if you have any other malfunctions with the instrument cluster. If you have, then I would look on the internet and find the places that have made a specialty of rebuilding GMs instrument clusters and have them rebuild it completely.

The speed o meter not working correctly is probably the result of a bad stepper motor inside the instrument cluster . GM had bad step motors from 2003 to 2006 . How to repair GM Instrument Cluster Speedometer Gauge Stepper .
The problem with the heated seat is more then likely bad heating elements . Testing the electrical circuit is the way to find the problem . CHEVY GMC SEAT HEATER TROUBLESHOOTING YouTube

the float is punctured

Common problem on the 03-06 Envoy instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Envoy fuel gauge problems

Rear fuse box is under the seat bottom, rear seat (middle row) on the driver's side. There is a plastic cover over the top of it that snaps into place.

The sending unit in your tank is bad replace it.

Before you start beating up thing's , test the electrical circuits. Do you know anything about automotive electrical systems ? How to use a volt meter an a wiring diagram to test for B+ power to the switch an testing the ground .
Does your envoy have memory seats ? Your vehicle has four or more electric motors to control back an foward , up an down etc.. the odds of more then one motor being bad at one time are highly unlikely .
Look under the seat any trash under there keeping it from moving ?
If you have memory seats there is a control module involved in making the seats work . If it has memory seats it could have DTC'S - diagnostic trouble codes .
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820
The seat adjuster switches are inputs to the driver and passenger seat modules. The seat modules supply the adjuster switch assemblies with a battery positive switch supply circuit and monitor the switch signal circuits. In an inactive state the switch signal circuits are floating and when a switch is pressed the signal circuit is closed to the switch power circuit within the adjuster switch assembly. When battery voltage is present on the switch signal circuit the seat module determines the switch status to be active.
DIY Blazer GMC Jimmy Power Seat Control Diagnostics and Repair Electric...

Sending unit. Its all one unit including fuel pump, float, ect. The check engine light is because of the high or low resistance in the unit. Let me know if you have already fixed.. You have to drop the tank to get to it also.

Under the rear seat, drivers side.
Black box you will need to remove the cover.
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Use a hammer and tap each of the travel rails on seat, this worked great for me, something just gets misaligned in there.