Question about 2000 Buick LeSabre
My compressor does not come on for my rear height leveler
When you turn the key on, after a couple of seconds the system should cycle the compressor on for a couple seconds at least. If not, you'll need to troubleshoot if it is an electrical problem (fuse, relay, height switch/sensor, wiring in between components/bad connections) or a mechanical problem (compressor, hoses, bladder on air shocks leaking air).
There is a fuse & a relay for the Electronic Level Control/ELC also called Automatic Level Control/ALC under the back seat in the power distribution block/fuse. Switch out a relay with a similar one and check the fuse for a burnt center section.
There is a ride height sensor attached to one of the rear control arms. With the vehicle safely raised and supported, disconnect the 'link' from the sensor to the suspension arm. With the key ON and engine NOT running, push the arm on the ride height to the compressed/riding low setting. After about 15-30 seconds (it is slow to respond or it would kick on and off over every bump) the compressor should turn on and begin filling the air bladders on the rear shocks.
If the compressor still fails to come on, you'll need to unhook the harness connector at the compressor. Again, with the key ON, engine OFF, height sensor compressed connect a voltmeter to the Dark Green wire on the chassis side of the harness connector (there are four wires to the compressor. 2 wires are for the electric motor to raise the car, and 2 wires are for the Vent solenoid the releases air pressure lowers the car) and ground to see if the compressor is being told to turn on by the height sensor. If it is being commanded on and supplied electricity, and still doesn't make noise or pressure, then replace it off a similar year GM vehicle that has rear air suspension (Cadillacs, Buicks, Oldsmobile Auroras). As long as the compressors are the same, you can just remount it in your car's mounting bracket assembly and save some $$.
If the compressor comes on but the car won't rise, check the air lines to each shock from the compressor, the bladders on the shocks themselves, the filter on the compressor intake or even the vent solenoid assembly on the compressor unit has been known to leak/corrode/stick.
Posted on Jun 23, 2014
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Posted on Jan 02, 2017
The rear leveling trip switch is located on driver's side near rear air shock on the frame. Check for leaks in air line.
Posted on Oct 21, 2009
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