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GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Rear airmatic stuck in up

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Old Jan 4, 2025 | 09:41 PM
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W164, W166
Rear airmatic stuck in up
After being parked for 10 minutes, I came out of the hotel today and the rear suspension had lifted itself up and is stuck there.

After a quick inspection, both leveling arms appear normal. I put a scanner on it to read the sensors. No new codes but something is going on with the voltages. 3 sensors have fluctuating voltages while one sensor has a constant voltage.

I'll look closer when I have time and space in the next couple of days but, any thoughts?
Last edited by Mercski; Jan 4, 2025 at 10:31 PM.
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Old Jan 5, 2025 | 01:27 AM
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NGL450 w/EORP, S550
The voltages are fluctuating with the car stationary? You’re not rocking or anything?
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Old Jan 5, 2025 | 07:28 AM
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Originally Posted by Max Blast
The voltages are fluctuating with the car stationary? You’re not rocking or anything?
Yes, correct. The car is in Park. The voltages are:

RR 1.16v
LR.0.84v
RF 2.98v
LF 2.08v

The RR doesn't fluctuate. All others do fluctuate.
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Old Jan 5, 2025 | 04:59 PM
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NGL450 w/EORP, S550
I would trace the connector where all the voltages go to - that would probably be the air Matic ECU, (which I don’t know where is) and check that connector.
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