Stereo seems fine, but - Page 2 - Mercedes-Benz Forum
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post #11 of 15 (permalink) Old 07-23-2019, 03:27 PM Thread Starter
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Yes, that is the same head unit. Someone told me it is probably the amp which is under the carpet, under the driver seat bolted to the floor metal. Removing the seat or cutting the carpet to pull out the amp and then inside the amp there are a couple transistors that can be replaced. That is, if the emap is the problem. I had a car electrician come out and troubleshoot with a meter and he said there is power going to the amp and all fuses are good, he was confident that the amp was the problem. However, it still could be a plug that's loose at the rear of the head unit... also possibly a break somewhere in the fiber optic cable... OH, and I did find the CD Changer in the glove box, it disappears when pushed up.
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post #12 of 15 (permalink) Old 07-24-2019, 07:42 AM
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Originally Posted by tonylinc View Post
Yes, that is the same head unit. Someone told me it is probably the amp which is under the carpet, under the driver seat bolted to the floor metal. Removing the seat or cutting the carpet to pull out the amp and then inside the amp there are a couple transistors that can be replaced. That is, if the emap is the problem. I had a car electrician come out and troubleshoot with a meter and he said there is power going to the amp and all fuses are good, he was confident that the amp was the problem. However, it still could be a plug that's loose at the rear of the head unit... also possibly a break somewhere in the fiber optic cable... OH, and I did find the CD Changer in the glove box, it disappears when pushed up.
You can start with the easy stuff. Try the plugs first.
By the way, the head unit plug pin description description is floating around on-line as I've seen it before which will help in confirming is the pre-amp signal is there.

Do you remember if this electrician mentioned anything about wire abuse (tapping, splicing, etc...) to or out of the amp.
The same can be applicable when you take out the head unit.

I've got some resource that I usually use: https://connector.pinoutguide.com/
From the same resource, this should be your pin-out for the rear plug: https://pinoutguide.com/Car-Stereo-M...2_pinout.shtml

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post #13 of 15 (permalink) Old 07-25-2019, 05:50 PM Thread Starter
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Well for his $85 diagnosis, the electrician guy didn't know the amp was under the floor caprpet, he thought it was one of the modules under the driver seat that you can look under the seat and see. It wasn't till after he left that I learned on YouTube where it is actually located, under the carpet. But he did say there was power going to the amp because everything sending it there was in order. I will have to find out how to get the head unit out of the dash and check all its plugs and connections. Many Thanks!!
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post #14 of 15 (permalink) Old 07-30-2019, 12:02 PM
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Tony,
For what its worth, could you check under the second row/left passenger seat for any loose connections with the satellite radio module and the rest of the modules?

Head unit removal, usually involves the removal of the ashtray and the drawer on top of it, pull down the left and right slide locks (carefully using a flat head screw driver) then extend your hand behind the unit and gently slide out. Check this video.
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post #15 of 15 (permalink) Old 08-01-2019, 03:21 PM Thread Starter
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Well, I had no idea that stuff was under the second row seat! There was a white plug about 2 inches by one-half inch, that was unplugged. I found where it goes and plugged it in. But it made no difference. I wonder what it goes to, and why it was unplugged. If it wasn't 92 degrees out there, I would follow the other posts here and look some more, but right now I am going to find some shade and some iced tea! Thanks tom everyone... will report more later.

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Last edited by tonylinc; 08-01-2019 at 04:14 PM.
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