Trigger Remote Start w/existing alarm

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=70249
Printed Date: May 14, 2024 at 8:24 AM

Topic: Trigger Remote Start w/existing alarm

Posted By: leoslocks
Subject: Trigger Remote Start w/existing alarm
Date Posted: January 07, 2006 at 11:30 AM

I have a 1999 Ford E 250 with a J-635 Alarm installed. I want to add a J-Start 3 remote start to the alarm.

I am not an alarm installer and did not install this alarm. Much of the instructions presume experience and knowldedge I may not aquire.

I do think I have connected the J-Start large wiring correctly. Where I am having trouble is getting the alarm to trigger the J-Start.
From the J-635 manual:
⇒ Gray Wire: Trunk release (Auxiliary channel 3) output. This wire supplies a 250 mA negative (-) output when the ‘TRUNK (3)’ button is pressed and held for 1.5 seconds. This output can be used to operate trunk release motors, remote starter units, etc. **Note** In most cases a relay must be used with this output. See diagram for relay hookup.

From the J-Start 3 manual:
Gray Wire: Auxillary negative output. Use this wire to control any extra relays needed to properly start the vehicle.

Orange Wire: Negative trigger input. Connect this wire to the output of the alarm or keyless entry unit that will be controlling the J-Str/3 unit. This wire is not needed when installing the J-Str/3-T unit. (the 3-T is an alarm and remote start in one unit..Not what I have.)

I have tried using the Gray wire (250mA negative putput) from the Alarm (J-635) connected to the Orange (Negative trigger input) wire of the Remote Start. Nothing happens.

Would using a Relay make this work? If so, how would it be wired?

J L Troy alarm, Home Page

J-635 pdf Here

J-Start 3T pdf Here

Replies:

Posted By: mo12v
Date Posted: January 07, 2006 at 4:49 PM

If you GROUND the Orange Wire on the Remote Start......Does it Start??

If so, (usually) you wouldn't need a Relay.
If Not, are you sure the ORANGE wire is the R/S wire?

SPDT Relay:

PIN 87 = ORANGE Wire on R / S
PIN 87a = XX
PIN 30 = GROUND
PIN 85 = GRAY Wire Output from J-635
PIN 86 = Constant 12 volt ( + )

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.

Posted By: Mike M2
Date Posted: January 07, 2006 at 4:58 PM

A relay shouldn't be needed. Do you have a hood pin switch connected to the blue wire? Make sure this wire doesn't have a ground on it as it will do absolutely nothing if it does. Like Mo says, a simple ground pulse to the orange should do the trick.

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Mike M2
Tech Manager
CS Dealer Services

Posted By: leoslocks
Date Posted: January 07, 2006 at 11:02 PM

mo12v wrote:

If you GROUND the Orange Wire on the Remote Start......Does it Start??

Sometimes it will start, other times it will start and die, ... start and die, three times then disable the alarm.

There is a motion sensor that has not been disabled. When I get the remote start to trigger from the #3 button of the remote transmitter, I will work that out.

There is no Hood Pin Switch attached to the blue wire.

I will try the relay and see if that works.

Thanks for the replys.

Posted By: Mike M2
Date Posted: January 08, 2006 at 7:57 AM

If it's starting sometimes it's not going to be a problem with wiring. It's probably a tach wire issue. You could try flipping switch 1 to voltage and see if it works then.

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Mike M2
Tech Manager
CS Dealer Services