Dual stage shock sensors

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=50210
Printed Date: May 21, 2024 at 1:48 AM

Topic: Dual stage shock sensors

Posted By: 6spd
Subject: Dual stage shock sensors
Date Posted: February 16, 2005 at 3:13 AM

Dual stage shock sensors have 4 wires. Where would you connect the pre-warn wire to? Can you connect it to the OEM horn wire?

Replies:

Posted By: misterjimbo
Date Posted: February 16, 2005 at 7:53 AM

prewarn would go to the prewarn input on the alarm. if you hooked it up to the horn how would you turn it off when you drive? you could put it on a switch, but then you would have to remember to turn it on and off. if you do decide to hook it up to a hrn you will need to add a relay.

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Posted By: 6spd
Date Posted: February 16, 2005 at 1:31 PM

Do factory alarms have pre-warn input?

Posted By: Custom_Jim
Date Posted: February 16, 2005 at 5:13 PM

misterjimbo wrote:

prewarn would go to the prewarn input on the alarm. if you hooked it up to the horn how would you turn it off when you drive? you could put it on a switch, but then you would have to remember to turn it on and off. if you do decide to hook it up to a hrn you will need to add a relay.

I added an impact sensor to a car that had a factory alarm on it that was only protecting the doors and used the dome light wire for activation. I wired the trigger off of the impact sensor just to the relays normally closed contacts and then wired the coil of the relay to an ignition 12V source (the other side of the relay coil to ground). When the car was off you could hit the car and trigger on the car's dome lights but when you were driving the impact sensor could not turn on the dome light as it was disconnected with the relay.

If you are trying to wire a warning output to a horn I would use one relay like above to where the horn will not honk while driving down the road and then another one to trigger the factory horn (the sensor you have may not be able to handle the current required to activate your horn circuit.

Jim

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1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street

Posted By: auex
Date Posted: February 16, 2005 at 5:24 PM

6spd] wrote:

Do factory alarms have pre-warn input?

No, technically they don't have any inputs. They are usually built into the BCM of the vehicle. Can you integrate into them, sure.

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