obdii switching
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=126775
Printed Date: May 15, 2025 at 2:20 AM
Topic: obdii switching
Posted By: is200_turbo
Subject: obdii switching
Date Posted: March 29, 2011 at 3:06 PM
HI all
im after some advice i have 2 OBD units that i need to connect to one obd port now i know that both units use a version of IP addressing which means that i get conflicts with both units plugged in, one must have priority etc.
what i am wondering is if its as simple as i think that if i put a relay in on certain pins it will then only allow one item to work at a time this is fine.
i know some of you are probably thinking why not just unplug etc and do it that way
due to the car pc and a set of gauges i would like to alternate between the 2
Cheers
Replies:
Posted By: is200_turbo
Date Posted: March 29, 2011 at 3:13 PM
infact thinking more about this the units get there power from the OBD port so could i put a toggle switch inline with it so the power is only going to one unit at a time?
Posted By: howie ll
Date Posted: March 29, 2011 at 3:16 PM
Don't mess with the OBD ll port, it can throw up trouble codes and cost you big money in the worst case.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: is200_turbo
Date Posted: March 30, 2011 at 2:46 AM
how would you suggest i get 2 devices to connect to it one is a gauge reading system the other is a code reader for the pc
the car is getting a full wire tuck so everything needs to be out the way......
Posted By: is200_turbo
Date Posted: April 23, 2011 at 5:54 AM
Okfrom my research and talking to some garages now I'm back on home land the idea of switching the lives should work but I'm going for stand alone ecu now so Wong matter lol
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