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'95 E320, 221k miles, fair cond
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Discussion Starter · #1 ·
My 95 E320's car horn / fanfare is going off intermittently. I disconnected the horns yesterday to avoid any stares or confrontations from other drivers.

I read that the clock spring may need to be replaced. But I also hear the horn relay behind the instrument cluster clicking when the horn had been goimg off.

My question is, is the horn relay a standard relay or is it specific to Mercedes?



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2016 C300, 2006 S430, 2003 C240, 1991 190E 2.6
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My 95 E320's car horn / fanfare is going off intermittently. I disconnected the horns yesterday to avoid any stares or confrontations from other drivers.

I read that the clock spring may need to be replaced. But I also hear the horn relay behind the instrument cluster clicking when the horn had been goimg off.

My question is, is the horn relay a standard relay or is it specific to Mercedes?
I do not know the "real" answer to your question, but, what I know is your horn assembly & relay is the same as on my 1991 190E 2.6. I vaguely remember, but I believe that the actual horn (003-542-28-20) is about the same retail cost as the relays (001-542-67-19). :( In fact, 190E MY1991-1993 & the 1993 300CE had the same factory assembly installed. It may be safe to assume these relays are specific to Mercedes. Can any member confirm this?:confused:
 
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Premium Member
2016 E350 wagon; 1994 E320 wagon
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pretty much all the relays in these w124's are mercedes specific as they use 4mm round terminals, instead of the more common flat blade terminals.
 

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'95 E320, 221k miles, fair cond
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Discussion Starter · #5 · (Edited)
It turns out that the rubber washers around the bolts holding the horn plate was disintegrating.





This causes the top plate holding the airbag and padding to contact the bottom plate through the bolt, thus activating the horn intermittently.



I bought 5 flat nylon washers from a hardware store to replace the disintegrated washers. I disconnected the battery and waited 15 minutes before I removed the airbag. You can access the 2 airbag bolts from the back of the steering wheel using a T27 Torx wrench. Just pull the padding with the airbag off and pull out the plug. The 5 bolts holding the top horn plate also uses a T27. Only three bolts are always in contact with the top plate when the horn plate is not depressed. But I put washers on all five bolts.



Problem solved. I'm just glad I was spared from a faulty clock spring, relay, or alarm module.




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1995 E420
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1995 Mercedes E420 - horn short repair

I had the same problem with my horn blowing. It started intermittently one day and then quickly became all the time.

I followed the repair process that Mercron describes here. I bought a T25 and T27 wrench. Turns out I needed both. Left side worked on T25 and right side needed a T27. It took a few minutes to break the bolts so they would turn. (My car is 23 years old!) They both eventually turned and that released the airbag. NOTE: The First thing I did was disconnect the negative side of the car battery. I let that sit about 30 minutes while I ran up to the hardware store to get the T25 and T27.

Once the airbag was lose I used a flat head screwdriver to release the yellow connector to the air bag. I then carefully set the air bag aside. I was worried about the airbag, but nothing bad happened. Thank goodness.

I purchased a 4 pack of plat NYLON washers, 5/16 in size. (got them at Lowes hardware here in Virginia Beach, VA). Those ended up fitting well. I used 2 washers on the top left bolt and on the top right bolt. Both bolts had a washer that had crumbled, just as shown on the photo by Mercron. I only placed the washers on the top left and right bolts, as those were the only 2 that seemed to have those crumbled washers underneath.

After installing the washers on the 2 top bolts I put the airbag back in.Then I reconnected the car battery.

RESULT: The horn did NOT blow when I started the car. The horn only blows when I press on the horn pad... exactly as it is meant to be. PROBLEM SOLVED.

I am so grateful that I found this simple solution. Thank you Mercron! :smile
 

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2007 E220CDI, 1990 300E-24V, 1987 W124 3.6 AMG build 1993 E500 W124, 94 320CE, 1997 W140 S280
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Nice fix and a failure I have not heard of before. Just a note to anyone reading this in the future. The most popular Pelican parts w124 airbag DIY states the wrong T27 torx size for the airbag removal.

The 2x airbag removal bolts are actually T30 torx. A T27 might remove them in most cases but it is the wrong size Torx and of your unlucky could round the bolt heads.
 

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2016 E350 wagon; 1994 E320 wagon
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re airbags, behind the passenger side footwell floor panel is a big red plug, unplug that, and your airbags are all 'safe'.

re: torx size, there's an old style and new style clock spring assembly.... its quite possible the bolt size changed, too. not sure what year it was, early 90s, tho. maybe 93?
 

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2007 E220CDI, 1990 300E-24V, 1987 W124 3.6 AMG build 1993 E500 W124, 94 320CE, 1997 W140 S280
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re airbags, behind the passenger side footwell floor panel is a big red plug, unplug that, and your airbags are all 'safe'.

re: torx size, there's an old style and new style clock spring assembly.... its quite possible the bolt size changed, too. not sure what year it was, early 90s, tho. maybe 93?
I don't believe clock springs were fitted to any model year w124. (My 1987, 1990, 1992, 1994 + 1995 w124 models all have squib rings for example)
 

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W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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13,130 Posts
Facelifted US models (94/95) have clock springs.

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2007 E220CDI, 1990 300E-24V, 1987 W124 3.6 AMG build 1993 E500 W124, 94 320CE, 1997 W140 S280
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Facelifted US models (94/95) have clock springs.

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That's interesting- must be a US model thing I haven't seen them on Euro w124 cars. But clocksprings may be a better /more reliable connection than the brushes / squib.

Always try a T30 Torx first and only if it does not fit then go down to a T27 size.
 
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