Notices
M-Class (W163) 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Low FM volume on radio

 
Old 07-15-2011, 08:36 PM
  #1  
Newbie
Thread Starter
 
Join Date: Jun 2011
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
ML 320
Low FM volume on radio

My radio will funtion properly on cd,tape,wb and even AM. The volume works perfect, but on FM the volume is very low. Has anyone had this problem and how was it solved. 2003 ML

Last edited by blu benzo; 07-15-2011 at 08:38 PM. Reason: Model os benz was left out
blu benzo is offline  
Old 07-27-2011, 11:02 AM
  #2  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
I have the exact same issue. I've done a lot of searches and you'll be farther ahead by going over to Benzworld.org. One suggestion was that the cause of the low or non audible volume on the FM is due to a faulty microphone that is housed in the rear view mirror base housing that is affixed to the windshield. On BW they posted up some MB diagrams and fix instructions, but it is extremely involved: must take apart the overhead console to get to the RV mirror so you can remove a certain clip to remove the mirror housing THEN find the little microphone to disconnect....and so forth.

I got a set of plastic pry tools to attack the overhead console, but I have yet to correspond with anyone who has actually DONE this operation. Most people elect to replace the entire head unit with an aftermarket unit like a Pioneer, which offers all the new features and none of the headaches of the stock MB head unit. VERY tempting I must admit.

I have hesitated to go after the speed-dependent volume microphone on my ML for fear of breaking other things and the possibility that the proposed fix won't work.

If anyone on this forum has successfully disconnected the microphone that affects the FM volume on an ML of the 03-04 vintage, I'd love to get the details. THANKS.
Attached Files
File Type: pdf
ML320 rear view remvl.pdf (89.9 KB, 901 views)
File Type: pdf
Radio%20Volume[1].pdf (160.9 KB, 882 views)
slik560 is offline  
Old 07-27-2011, 11:30 AM
  #3  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
I just went to EPC to look at the parts diagrams. From what I see, the rear view mirror & housing is a separate assembly from the overhead controls housing. You should not have to remove the controls housing to get the cover for the rear view mirror cover (where the microphone and rain sensor are) from the way it looks. Diagrams can be deceiving, though.

I've re-read everything and I think I may know how to remove the housing for the microphone. I'm going to try it today and I will post results tonight or tomorrow.

Cross your fingers. It should not be this hard...but then again...we are dealing with MB over-engineering.
slik560 is offline  
Old 07-28-2011, 11:32 AM
  #4  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
False alarm. I tried to work the housing on the mirror mount off by hand. I thought applying pressure on both sides (squeezing like hell) would make it pop loose. No.

Next step is go get out the trim removal tools and see if I can make headway.
slik560 is offline  
Old 07-28-2011, 08:56 PM
  #5  
Newbie
Thread Starter
 
Join Date: Jun 2011
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
ML 320
Dear slik560

Thank you very much for your help in trying to resolve this problem. I was able to get my RV mirror off. It fits on a U shape housing.I got it off by pulling down on the mirror stalk and pulling it out from the bottom at the same time (be careful). There is a box attached to the windshield with 2 wires plugged into it. One wire goes up under the headliner into the console. The other wire plugs into the plasyc mirror housing. The wire covering was dried out and frayed wires where sticking through it.I have a few pictures off it but i dont know how to post them with this reply. But going togive it a try. By the way what is EPC?
blu benzo is offline  
Old 07-28-2011, 10:36 PM
  #6  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
Which way did you pull? Down and towards the front of the car, the rear?? I'd love to see a photo. So you did not have to remove anything else? BTW, does the FM volume work now? Funny...I was trying to help and now it's me that has all the questions.

EPC net is a Mercedes Benz online service that allows you to look up any part for any Benz. Every assembly has diagrams. You have to register and even provide a credit card #, even though it's free...unless you want to access European models.

https://epc.startekinfo.com/epc/home.jsp

Last edited by slik560; 07-29-2011 at 11:04 AM.
slik560 is offline  
Old 07-29-2011, 08:47 PM
  #7  
Newbie
Thread Starter
 
Join Date: Jun 2011
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
ML 320
Low FM volume

I pull down and towards me also with a twisting left and right Because the attaching piece is a U shaped metal piece on the winshield. Now that frees the mirror housing. My RV is not auto dimming.But there is fitting inside the housing and runs to a connection to the box attached to the mirrorme is still low because this just the beginning of the problem. Finally got pics up
Attached Thumbnails Low FM volume on radio-recent-imports-082.jpg   Low FM volume on radio-recent-imports-084.jpg   Low FM volume on radio-recent-imports-085.jpg   Low FM volume on radio-recent-imports-090.jpg  
blu benzo is offline  
Old 07-30-2011, 10:17 AM
  #8  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
Thanks for putting up the photos. I don't see the microphone that the diagrams showed. I wonder if the FM volume problem is with the amplifier.

One other strange thing that happened when I had FM volume and still happens with the CD volume is that when I drive near high power electrical lines, the volume ramps up to near max without touching the controls. When I turn away, the volume drops back down. THAT is a mystery.
slik560 is offline  
Old 08-05-2011, 10:52 AM
  #9  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
Well....cracked the damn windshield trying to get the mirror off. That does it. I may look at disconnecting the microphone when the windshield gets replaced, but now the project has an extra $250 cost in the form of the insurance deductible. I could have put that towards a new head unit. Warning - it did not take much force at all to crack the windshield.
slik560 is offline  
Old 04-28-2015, 09:13 PM
  #10  
Newbie
 
Join Date: Oct 2005
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
I'm having the same issues, however disconnecting the microphone didn't do anything to fix it. Everything plays fine with normal volume except FM, time to look elsewhere
lewda is offline  
Old 04-28-2015, 10:09 PM
  #11  
Senior Member
 
slik560's Avatar
 
Join Date: Sep 2007
Location: Overland Park, Kansas
Posts: 266
Received 2 Likes on 2 Posts
1987 560SL 2003 ML320
First an apology - I neglected to report back on the solution to my particular situation. After all the reading, probing, breaking and swearing, I finally sent my head unit off to Becker Autosound after talking with them about what all had happened. It came back expertly rebuilt and has worked flawlessly ever since. That was almost two years ago.

I would recommend doing this. ALL the symptoms could be traced back to a defective head unit. Eventually, everything will go: AM volume, CD player volume...everything.

PS: I still have yet to replace the windshield.
slik560 is offline  
Old 06-21-2015, 12:18 PM
  #12  
Newbie
 
Join Date: Sep 2014
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
2004 ML500
Same Issue

A few weeks ago for no reason the window speaker on the passenger side door fell off when my kid opened the door. Ok, so I put it back no problems. 3 weeks later I get very low sound on FM when the volume is turned all the way up. AM and NAVI sound is fine. Stereo guy wants to put in a whole new unit. Upon hearing this I went home fooled around with the speaker that fell off and the FM was back. Great. Not so much because it stopped working again is now in that low volume state again. I feel I know what the problem is but can't fix it. I know nothing about cars.
Heidi'sgotaBenz is offline  
Old 10-15-2018, 04:13 AM
  #13  
Newbie
 
Join Date: Oct 2018
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Mercedes ML500
Hi, I'm having the same problem on the FM radio volume issue on my 2003 Mercedes ML500. I'm little confused about how you fixed the volume. Did you send it out to get it fixed or did you fix it yourself and how? Than you.
ArnoldG is offline  
 

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Low FM volume on radio


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: