Horn Negative Ouput Question

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=12145
Printed Date: July 18, 2025 at 10:40 AM

Topic: Horn Negative Ouput Question

Posted By: Sebastian018
Subject: Horn Negative Ouput Question
Date Posted: April 13, 2003 at 2:14 PM

Hi, I have a mercedes 190e 1986 and Im trying to connecting the Horn Output wire of Prestige aps 785, and I Need some info in how to do it.

thank you

Replies:

Posted By: draasch
Date Posted: April 13, 2003 at 9:30 PM

what type of output is coming from the alarm???????

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Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt

Posted By: Velocity Motors
Date Posted: April 13, 2003 at 9:52 PM

BLACK/ WHITE (-) trigger from APS needs to trigger a relay to engage the horn. This wire is only a low level (-) output and you need relay to reverse the polarity of this wire to a (+) for the horn on the Mercedes ( BLACK / YELLOW ) found at the anti-theft module ,Anti-theft unit is located in the passenger footwell under a plastic cover against the firewall.

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Negative to Positive Relay Diagram

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

Posted By: Sebastian018
Date Posted: April 14, 2003 at 9:17 AM

HI I dont get Pin 30< where do i connect it?

Posted By: Sebastian018
Date Posted: April 14, 2003 at 9:22 AM

Pin 30= BLACK/ WHITE (-) ?
BLACK / YELLOW ?

Which one