Hi, the function of keeping the idle is performed by the idle air control valve. The valve may be stuck or the air passage clogged. This is not related to replacing the battery. Use a voltmeter to probe the back of the connector. Then start the engine and watch the meter as you turn on the a/c. You should see a blip in voltage as the computer tries to open the valve. If no blip, suspect you have a wiring issue. If there is a blip, remove the valve and check the air passages for blockage. If you see blockage, clean with carb cleaner. If no blockage, install a new valve.
Unless you really know what you are doing it is best to get a mechanic to repair this. People's lives and safety are at risk and you could be held legally if something went wrong with your repair job. I would not touch 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...
Daihatsu Charade EL 2003 rear lens removal. Open the tailgate and remove the two bolts securing the lens assembly. Then get a good hold of the lens and pull out. You need to pull out the whole lens assembly since there are three plastic protruding 'clips' on the side along the lens. Please view attached pictures. Then turn the bayonet bulb holder, replace the slide on type bulb and reassemble everything back in place.