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Back Airmatic fuse keeps blowing

Tiny
GHOST514L3
  • MEMBER
  • 2008 MERCEDES BENZ GL450
  • V8
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
Had front and back compressor replaced and now fuse for back Airmatic keep getting blown. Went through 3 fuses in a week.
Friday, October 9th, 2020 AT 9:53 AM

7 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Can you let me know what specific fuse is blowing? I am not seeing a specific fuse for the rear system nor is there a rear Airmatic compressor or module. According to the wiring diagram, it is run off of one compressor and control module so I am just trying to figure out which fuse this is so that we can figure out what is causing it to fail.

I attached the wiring diagram for your review. Let me know and we can go from there. Thanks
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Friday, October 9th, 2020 AT 7:37 PM
Tiny
GHOST514L3
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Fuse 108 under hood.
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Saturday, October 10th, 2020 AT 6:10 AM
Tiny
KASEKENNY
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Got it. That helps. This is the fuse solely for the compressor so either you have an issue in the wiring or loose ground. Or more likely the compressor is the issue and it is drawing too much current and blowing the fuse.

So I am concerned when you say that you had the front and rear compressor replaced as I am only seeing one compressor as it is rare that you would have a compressor for the front and rear. The two axles need to work together so they should run off the same compressor. Are you should you didn't have the front and rear dampening units replaced? Do you have the part numbers of what they replaced?
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Saturday, October 10th, 2020 AT 1:40 PM
Tiny
GHOST514L3
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Yes, I'm not really sure now. But I know compressor been replaced twice I brought car back in Feb and problem seem to happen every few weeks. Believe it or not seems like back and front take turn going out but now lately it's just been fuses soon as you put one in you hear it pop right away.
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Saturday, October 10th, 2020 AT 3:27 PM
Tiny
KASEKENNY
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Okay. Then you have a short in the wiring or a loose ground. Are you familiar with how to test that wiring for a short to ground? Basically you need to unhook the compressor connector and then check the compressor side of the fuse for a short. You simply take a test light, hook the clip end to the battery positive. Then touch the testing prong (sharp tip) to the side of the fuse that the compressor is on and the light should not come on. If it comes on then you have a path to ground which you should not because the compressor is unhooked and that ground path is after the compressor. So this means you have a wire that is touching something metal and it is blowing the fuse.

Does that make sense?
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Saturday, October 10th, 2020 AT 5:01 PM
Tiny
GHOST514L3
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Hmm, so on that note with the fuse wiring connecting to battery. I had subs could the wiring on the battery to the subs be causing the problem?
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Sunday, October 11th, 2020 AT 7:04 AM
Tiny
KASEKENNY
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It is unlikely because that is not directly tied to this circuit. For this specific fuse to continue blowing means there is something "downstream" of the fuse that is causing the issue. The battery is upstream of the fuse so I doubt that would cause it.

If you want, the easiest way to find out is to unhook the subwoofer from the battery and see if the fuse stops blowing.
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Sunday, October 11th, 2020 AT 1:57 PM

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