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I'm not familiar will your vehicle but check the basics , fuses ,see if there is anything under the seat stuck in the seat track. Find a wiring diagram an see if there are any relays an seat control modules involved ! You owners manual should tell you fuse position !
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Did you check in the track for the seat to make sure there is nothing is stuck in the track.If nothing in the track its either in the switch or in the motor.
The back and foward movement uses the same motor. So if it moves one way but not the other it's most likely the switch. Try to blow it out or clean it out. If pop or somthing spilled on it you will prob. need to pull switch out and take it apart to clean contacks inside.
The seat has a transmission to move the seat up, down, foward , & back. Screw jacks adjust the seat up & down. Cables move the seat forward & back. The cable it seems had to break or the end of the cable has rounded out. Possibly the cable rounded out the seat it rides in the transimission housing too. You will need to remove the seat to find out
will or wont move foward? you can get to the wiring block under seat. isolate wiring from motor 1 of three, (middle motor- foward back, front motor - front seat base up / down, back motor - back seat base up /down) does it work of mem. buttons? or when u lean seat foward (entry assist).
If the seat has a lever to allow entry to rear seat the fnt seat back and seat roll foward[2 door jeep]. Move the seat back back to normal and push loose seat all the way foward and then all the way back.let me know if that helps
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...
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