Mercedes door switch for ground unusual p

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=71826
Printed Date: July 19, 2025 at 2:22 AM

Topic: Mercedes door switch for ground unusual p

Posted By: dhs9
Subject: Mercedes door switch for ground unusual p
Date Posted: January 30, 2006 at 10:36 AM

I am working on a 2000 S class mercedes and intalling the lighted door sills. I need a constant 12v and a ground which is triggered when the door opens. When I pulled out the door pin switch and put a meter on it I have continuity to ground when I push the switch the gound is broken. However when I tapped into the pin switch wire and tried the lighted sill when I release the switch it does light up but when I push the switch insted of the sill going out as I expected it only gets dimmer not out. I check the voltage on the ground wire when it is pushed in and I get 1v. I am stumped. Would a diode help?Thanks for any replys

Replies:

Posted By: lsampson
Date Posted: January 31, 2006 at 10:27 PM

try this, wire a relay with 87 as ground 85 as 12v 86 to the pin switch and 30 the the ground for the lights which should only give a ground pulse to the lights when the door is giving off a true ground I'm pretty sure that 1volt shouldn't be enough to trigger the relay when the pin switch is in. let me know how it works out!

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Sammy

Posted By: Cozz
Date Posted: February 01, 2006 at 7:32 PM

Use the dome lights for your signal. If you are putting them on the front rear doors then use the both dome lights for each pair of sills. Front and rear dome lights work seperately