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Dome light trigger for Mercedes 300E

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10826
Printed Date: June 04, 2024 at 11:06 AM


Topic: Dome light trigger for Mercedes 300E

Posted By: Turbo W124
Subject: Dome light trigger for Mercedes 300E
Date Posted: March 12, 2003 at 9:34 PM

How would I go about doing this? It seems easier to splice into the rear door sensors. Are they grounded when the doors are open? (Does this mean negative door trigger?) Thanks!



Replies:

Posted By: Velocity Motors
Date Posted: March 13, 2003 at 4:31 PM
What year 300E ?

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA



Posted By: Turbo W124
Date Posted: March 14, 2003 at 2:12 AM
It's a 1987 model. Thanks for any help!



Posted By: Car-Stuff
Date Posted: March 14, 2003 at 9:56 AM

The older Mercs normally have seperate circuits for front and rear doors. The door switches just pop out, I think they are something like BROWN / Grey from memory at the rear of the front and rear switches. You will normally have to split  your input to your alarm via 2 diodes.

Hope this helps

Nick




Posted By: Jussi
Date Posted: March 14, 2003 at 2:58 PM
The older Mercs normally have seperate circuits for front and rear doors. The door switches just pop out, I think they are something like BROWN / Grey from memory at the rear of the front and rear switches. You will normally have to split your input to your alarm via 2 diodes...

Yes, that's correct. You have to use diodes and if your alarm "needs" groundable wires... you have to use couple of relays also :-(

JL

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Installer/Owner

JL-Autosound

Helsinki, FINLAND



Posted By: Velocity Motors
Date Posted: March 14, 2003 at 4:16 PM

|       ITEM      |     WIRE COLOR     |POL|       WIRE LOCATION        |
|              12V|red                 |+  |ignition harness -          |
|          STARTER|purple              |+  |access by pulling           |
|         IGNITION|pink/red            |+  |instrument cluster          |
|  SECOND IGNITION|pink / YELLOW(2nd acc)|+  |                            |
|        ACCESSORY|pink/green          |+  |out of front of dash        |
|       POWER LOCK|blue or green *2    |E  |either kick panel           |
|     POWER UNLOCK|blue or green *2    |E  |                            |
| PARKING LIGHTS +|gray, gray/white    |   |lt. switch or alarm         |
|       HEADLIGHTS|WHITE/ yellow        |+  |at light switch             |
|     DOOR TRIGGER|brn/gry,brn/gry/blk |-  |see notes *3                |
|  TRUNK/HATCH PIN|BLACK / YELLOW        |-  |at trunk lt. or alarm       |
|         HOOD PIN|BROWN / red           |-  |at switch or alarm mod      |
|  FCTRY ALARM ARM|yel/grn or yel/blue |-  |door harness or alarm       |
|FCTRY ALRM DISARM|GREEN/ YELLOW        |-  |door harness or alarm       |
|       TACHOMETER|black, GREEN/ yel *1 |   |coil left inner fender      |
|       BRAKE WIRE|BLACK/ RED / white     |+  |brake switch or alarm       |
|     HORN TRIGGER|BLACK / YELLOW/pink   |+  |st. column harness          |
|           WIPERS|blu and blk (hi/low)|+  |*4                          |

Notes:
*1 GREEN/ YELLOW at back of instrument cluster.  *2 Blue wire located in 1/4 inch blk rubber tube with RED / wht and brown wires coming out of drivers door. Passenger side same except trigger wire is green. Pump located under rear seat on passenger side.  *3 Front doors are brn/gry-at right pin or alarm module located under passenger foot board. Rear doors are brn/gry/blk-at pin or alarm.  *4 at combination switch, also found at the switch plug Blk/yel/gray and Blk/yel/wht for high and low wiper speeds.



-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA


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