Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-13-2003, 03:08 PM
Registered User
 
Join Date: May 2003
Location: Atlanta
Posts: 398
Question Factory Alarm Not working - HELP!

Here is a question for ya.

When I lock my door with the master key and open the door without the key (ie. with window down, I reach in, manually unlock and open the door) the car SHOULD flash its lights and honk a horn...correct? My 1990 300E does this. My 1994 E420 does not. The lights on the 420 do flash but the horn doesn’t honk. I know the horn does work, and actually I took a meter and there was no voltage coming to it. No fuses are burnt out. Any relays in the rear-most compartment that could be involved in this? Where should I start?

Reply With Quote
  #2  
Old 07-14-2003, 08:17 AM
Registered User
 
Join Date: Dec 2002
Posts: 305
Do you have an aftermarket stereo?? Any chace that it has been disabled??
__________________
89 300SEL Money Pit

92 Blown Buick Ultra Pimpmobile 220K and adding 1K per week

88 Wagoneer Slightly modified (Not for soccer moms)

04 Kia Sedona with every option... NICE
Reply With Quote
  #3  
Old 07-14-2003, 09:06 AM
wjm's Avatar
wjm wjm is offline
Statman
 
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
I have the same car.

So it looks like (according to you) that the alarm is working... just no sound.

The alarm is seen by removing the front floor mat... BOTH LAYERS. Then unscrew the 1 screw holding the black metal cover. Remove that. The alarm is the black box to the left with 2 plugs on it. Make sure both are in tight and that they have not been cut into.

If everything looks ok, check the wiring harness' from the alarm down through the black cover on the right of the floor. See if anything has been cut.

Last edited by wjm; 07-14-2003 at 09:37 AM.
Reply With Quote
  #4  
Old 07-14-2003, 09:16 AM
wjm's Avatar
wjm wjm is offline
Statman
 
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
By the way, did you ever change your horns per previous post? What did you finally put in? I hate the sound of this car's horn as well.

Oh yea.. one more thing... is it the actual horns that are used with the alarm? I see another horn looking thing in the hood area. I'll have to check it out. The wiring diagram in ALLDATA refers to an "alarm horn"... hmm....

Last edited by wjm; 07-14-2003 at 09:37 AM.
Reply With Quote
  #5  
Old 07-14-2003, 09:38 PM
Registered User
 
Join Date: May 2003
Location: Atlanta
Posts: 398
Jay3000: car is 100% stock, radio and all.

wjm: heh, no I haven’t gotten around to getting the new horns. Anywho, no, the alarm uses a separate disc horn that is behind the drivers-side headlight. it does not use the horns that are behind the grille. I traced the wiring back from the "alarm horn" to the fuse box and couldn’t see much - it being wrapped up and all. I will look into the alarm control box (under the driver’s floor) in a day or so. But yes you are correct, the alarm is working, just without sound.
Reply With Quote
  #6  
Old 07-14-2003, 09:53 PM
wjm's Avatar
wjm wjm is offline
Statman
 
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
You know... now that I think of it.. this should be VERY EASY to resolve.

First pull out the alarm horn and put 12 volts to it. That should tell you if the horn works.

The horn has 2 wires... one is brown (ground) and the other is Black w/yellow stripe and red dots. This black wire is wired directly to one of the alarm plugs (ok... maybe it makes a stop at the fusebox... I don't know.. will have to check alldata). Just unplug the correct plug and test for continuity. Also test for continuity between the brown wire and any ground on the vehicle.

I just installed a bergwerks keyless entry system in my car. Currently the lights flash when opening and closing. I just purchased another relay in order connect the alarm horn as well.

Good luck.
Reply With Quote
  #7  
Old 07-14-2003, 09:58 PM
Registered User
 
Join Date: May 2003
Location: Atlanta
Posts: 398
hey WJM, while I got you here, tell me more about your buzzer-to-chime upgrade. The factory benz buzzer is annoying as hell. Where in the dash is the buzzer?
Reply With Quote
  #8  
Old 07-14-2003, 10:15 PM
wjm's Avatar
wjm wjm is offline
Statman
 
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
It's in the warning module behind the instrument cluster. I've got pictures that I took and will be posting later this week or early next week. The chime I put in is not load enough, so I had to order a different one... Mallory Sonalert SC616CPN. Should have it in my hands late this week.

It is a HUGE PAIN to take out the entire warning module. So what I do is unplug the harness (plug), then take 2 butter knives (or screwdrivers) and separate the outer casing from the inners and pull the inners out. There is a plastic "nose" on the circuitry that you can grab with a needle nose plyers once you have a butter knife lodged in the top and bottom of the module.

Once out, it's just a matter of unsoldering the old buzzer and soldering 2 wires that you will run outside of the module box and connect to the chime. The chime I have has 2 screws to connect the wires to. I then cover them with tape.. insert the circuitry back in and squeeze the chime into the right side of the instrument cluster housing... pushing back enough so that it does not get in the way.

Also, to make room for the 2 wires, I notched out a piece of the plastic where the harness connects to.

Not sure if that makes sense... but pictures should help.
Reply With Quote
  #9  
Old 07-22-2003, 11:33 AM
wjm's Avatar
wjm wjm is offline
Statman
 
Join Date: Dec 2000
Location: Suburban Detroit, MI
Posts: 692
ATLBENZ,

Status???? Did you get it fixed?

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page