G'day Stacoq and welcome to the forum from Pommieland.
The outline of a saloon car in side profile does indeed indicate a malfunction has occurred with the Air Body Control system. If it is amber in colour rather than red, it is the notification of a non-critical fault. In my case the car's management computer was not happy with the release time being taken to depressurise the ABC. It was taking too long and because it had now fallen outside operating tolerances, the malfunction icon would appear. The light would not come on immediately after starting the car but would activate at random times ranging from 5 - 30 minutes. Once on, it would stay illuminated until the engine was switched off and then the whole procedure would start again. Like your experience, there was no discernible difference in the performance of the suspension and the warning could be cancelled until the next time by hitting OK. Hooked up to the Star Diagnostics machine at my Dealership, the fault code that was thrown up pointed to the air compressor unit. A replacement was ordered and fitted the following week. It took about 90 minutes and the malfunction has not appeared again in the 5 months since the compressor was swopped out. I'm so glad this problem appeared within the warranty period as I suspect the cost of a replacement pump would not come cheap.
Hope you get it sorted without too much aggro.
The outline of a saloon car in side profile does indeed indicate a malfunction has occurred with the Air Body Control system. If it is amber in colour rather than red, it is the notification of a non-critical fault. In my case the car's management computer was not happy with the release time being taken to depressurise the ABC. It was taking too long and because it had now fallen outside operating tolerances, the malfunction icon would appear. The light would not come on immediately after starting the car but would activate at random times ranging from 5 - 30 minutes. Once on, it would stay illuminated until the engine was switched off and then the whole procedure would start again. Like your experience, there was no discernible difference in the performance of the suspension and the warning could be cancelled until the next time by hitting OK. Hooked up to the Star Diagnostics machine at my Dealership, the fault code that was thrown up pointed to the air compressor unit. A replacement was ordered and fitted the following week. It took about 90 minutes and the malfunction has not appeared again in the 5 months since the compressor was swopped out. I'm so glad this problem appeared within the warranty period as I suspect the cost of a replacement pump would not come cheap.
Hope you get it sorted without too much aggro.
- your outline was spot on, Thanks. It's exactly what I've been experiencing & as I suspected, I wasn't going to be the only GLC owner in the world experiencing this. Great to have this Global forum for the GLC. I've also have no doubt that we aren't the only GLC owners with ABC option that are having this issue & that MB engineers will be aware of the problem. Looks like there is an issue with either engine management programming or mechanical issue with de-pressurising valve sticking or both. Either way, it's something that MB needs to address. Interestingly, like you the 1st repairer had the same diagnostic fault code that pointed to the ACU. My ACU was also swapped out, but problem still persists, which may suggest programming is implicated as well. In fact, the amber coloured saloon with the malfunction warning came on as I drove off from the 1st repairer with my new ACU!! 2nd repairer confirmed that swapping out the ACU is the MB recommended action to take & given that this hasn't corrected the fault, loose electrical connections are next best troubleshooting action. Now that checking all of the potential electrical connections hasn't fixed problem, they want to escalate resolution with MB engineers. Surely, I haven't got a 2nd dud ACU. They claim they'll need car for at least 2 days. I have it booked in again for 17th October. Fingers crossed. I'll pass on your feedback to my repairer & I'll try to hold back on the aggro. Very frustrating given $$ spent on vehicle purchase & not what one expects from MB.
