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 ShopForum > Technical Information and Support > Tech Help

Closed Thread
LinkBack Thread Tools Display Modes
Old 06-15-1999, 03:27 PM
Posts: n/a
I've had a 88 300E for about 2 months now. I read the owners manual and assumed the car didn't have an alarm as I don't have a key with a red dot and it never went off.

A least until Saturday morning when I opened the door (it wasn't locked.) The horn started beeping and the lights were flashing. I eventually disconnected the horn but the lights stayed flashing. They eventually stopped. (I didn't try the key in the door, would this have turned it off, I did try it in the ignition.)

It was raining fairly heavily out so I believe I have a short of some kind in the system. I would like some advice on finding the short if possible. Just places to look or common problems.

Also, If I do happen to fix the problem, how can I tell if I have a master key that will turn off the alarm (try turning it off, got that.) But can I get a master key if I don't have one.

Thanks for the great site. Looking forward to buying stuff here.
Old 06-15-1999, 06:13 PM
Posts: n/a
I too have an '88 300E. (None of my keys has a red dot either.) If you use the key to lock the doors (from either passenger or driver side front doors), the alarm will be armed. Also, If you lock the trunk (which also locks the doors) this arms the alarm. I have a problem now in which I lock the doors but the rear passenger side door does not lock, so I open the door and off goes the alarm.

To turn off the alarm place the key in either the driver or passenger side front door and turn the key. This will shut off the alarm.

The alarm will go off if someone tries to:
-Open a door
-Open the trunk
-Open the hood
-Remove the radio (stock radio that is)
-Switch on or bridge the ignition circuit
-Step on the brake pedal

The alarm will sound for approx. 150 seconds (the horn will honk for 60 of those seconds) with the lights flashing on and off.

On some models (190's I think) there is a way to dis-engage the alarm system all together. I'm not sure how/if this is possible on the 300E's.

Good luck!

Stephen Davis
1988 300E 90k miles "The Cabernet Cruiser"
MBCA - N. Texas Section

p.s. - did I answer question you already knew the answers to?!? Sorry if I did.
Old 06-15-1999, 06:18 PM
Posts: n/a
Me again.

I had an idea - Is the radio in your 300E stock or after-market? If aftermarket - how was the anti-theft wiring treated?

Also, if the ignition circuit could cause an alarm and this is one of the more likely palces to get wet - maybe you could check the connections at this point outwards. You may have a trick wire there.

Finally - check the sensors/switches under the hood & in the trunk. Maybe they are gummed up or not functioning properly.

Maybe one of the tech guys will have more light to shed on this.

Stephen Davis
1988 300E 90k miles "The Cabernet Cruiser"
MBCA - N. Texas Section
Old 06-15-1999, 09:28 PM
Posts: n/a
On all of the older MB's the control unit can be disconneted of its power and it will be disabled without having any problems with any other systems. The alarm can be armed and disarmed from the trunk as well.
On an aftermarket radio you just have to lay the harness for the alarm out of the way and it will ignore this part of the system.


Closed Thread


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
remote entry won't arm alarm 92 300E Uncle Acky Car Audio and Multimedia 11 02-22-2008 01:38 PM
Any help with an Audi alarm?? JustinMorrison Tech Help 2 01-13-2005 07:57 PM
alarm module 93 300E 3.2 deportes Tech Help 3 11-23-2004 01:52 PM
Alarm for 92 300E CuCullin Tech Help 6 07-08-2003 04:59 AM
How do I disconnect the alarm on my 300E? arias Tech Help 5 02-29-2000 06:13 PM

All times are GMT -4. The time now is 07:32 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page