BMW 325i? convertable top by aux channel

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=68471
Printed Date: August 27, 2025 at 8:00 PM

Topic: BMW 325i? convertable top by aux channel

Posted By: meltingplastic
Subject: BMW 325i? convertable top by aux channel
Date Posted: December 15, 2005 at 8:42 PM

hey guys

had a customer come in today and wants to do an alarm on his bmw.. unfortunately forgot what year and model beamer it was i think it was a 02 325 convertable... i may be wrong not a big bmw fan so.. needless to say he wants to be able to controll his top via the remote. i know you have to step on the brake to allow the top to work. how would i go about having the car think the brake is pressed if this is even possible and has anyone done this before and have any help with it. or is it just a lost cause?

-------------
Driving a Bagged, Caddied 02 s10

Replies:

Posted By: KPierson
Date Posted: December 15, 2005 at 10:54 PM

Use an aux out channel to control two relays

First relay will energize and apply 12vdc to the brake wire.

Second relay will provide whatever signal is needed to raise the top.

You may want to look in to the ability to rasie the top by turning the key in the drivers key cylinder. I've heard certain models have roofs that will raise this way. If this is the case, you'll just need to ground the lock side of the key cylinder with a validity channel (or pulse timer relay)

-------------
Kevin Pierson

Posted By: Ween
Date Posted: December 16, 2005 at 6:41 AM

hi,

does the customer need the vehicle to be running vehicle when performing this operation? does it have mechanical latches to release the top near the windshield? is he looking for open and close operation? just a few things to look into before attempting.

mark

Posted By: cntrylvr79
Date Posted: December 17, 2005 at 11:24 PM

Did this for a customer a year or so back had a newer 330xi. I think all I had to do was pull the switch out and a momentary ground pulse on 1 of the wires w/ the parking break set would trigger the top to unlock and lift.

-------------
Cause I'm So white and nerdy...
First Class Certi-fried installer