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suspension fail

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Old 07-25-16, 06:10 AM   #1
Ashmead
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My 2006 GX470 died on the road last week, year-old battery was near dead. Had it taken to repair shop where they installed alternator. When I picked it up, it was riding so rough that after a hundred yards I turned around and took it back, felt like a wheel was out of round. Turns out the reason is that the rear suspension has quit. I have tried cycling the ride height up and down, but while the light moves from lo to N to Hi, nothing happens. Also, after one change in the height setting, from N to Hi for example, I have to turn the engine off and on to get the height switch to respond again.

I've checked fuses #5 and 51 and they are good. I disconnected the battery for an hour to no avail. Could the alternator failure have caused this somehow?
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Old 07-25-16, 07:11 AM   #2
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Do you hear the pump run when you change the height from L to Hi?

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Old 07-25-16, 04:01 PM   #3
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Yes, I hear a buzzing or motor sound from the rear axle area when i change the height setting. This lasts about 45 seconds during which time the indicator light flashes, for example "H", and then it stops and the light stays on in the new setting. To cycle to another level, though, I have to turn the engine off and then on again. Unless I do, the ride height selector switch does nothing.
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Old 07-25-16, 05:06 PM   #4
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It's possible it needs to have the ride height relearned after your issues.
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Old 07-26-16, 08:22 AM   #5
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Another possibility is a bad height sensor. Have you recently run over anything? Brush? Snow?

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Old 07-26-16, 01:01 PM   #6
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never overlook the possibility of a coincidence....a new problem that has nothing do with the first...maybe a pin hole in air bags? that is usually the most common rear suspension problem.
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Old 08-05-16, 02:44 PM   #7
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What may have happened here is the shop put the truck on a lift with the key on. The pump overran the airbags and blew something out. It could be a seal, a bag, something. That's why there is an off button, and a warning decal on the left side of the lower console. You MUST turn the suspension off whenever you raise the vehicle, even with a floor jack.

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Old 08-08-16, 12:22 AM   #8
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Quote:
Originally Posted by Randy20g View Post
What may have happened here is the shop put the truck on a lift with the key on. The pump overran the airbags and blew something out. It could be a seal, a bag, something. That's why there is an off button, and a warning decal on the left side of the lower console. You MUST turn the suspension off whenever you raise the vehicle, even with a floor jack.
I don't think it would run the bags, the wheel well distance increase and you hear a psst to release air instead. (it simply gets deflated). while I never had started the car while wheels are lifted off the ground, there is nothing happening to it even when I forgot to turn on the OFF button. I believe I might hear the solenoid to release a bit of air as the car get jacked up.
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