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led scanner for factory alarm?

Home / the12volt's Install Bay / Lights, Neon, LEDs, HIDs / led scanner for factory alarm? (Topic Closed Topic Closed)
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customcutlass92 
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Posted: April 02, 2007 at 7:26 PM / IP Logged  

I have an led scanner that i picked up a couple years ago laying around and just decided to try to install it. Does anyone know how or if its possible to install this with my factory alarm/keyless entry system? I want to put it behind the grille of my 2000 Impala LS. Thanks for any help, Brad Thomsen

Big Dog 
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Posted: April 13, 2007 at 10:42 AM / IP Logged  

LED scanners usually have two wires : Red, Black. Connect Red to B+, connect Black to brown ACC wire of vehicle.

It will scan at all times whether it's armed or not execpt when the key is on ACC or RUN.

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customcutlass92 
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Posted: April 17, 2007 at 12:44 AM / IP Logged  
Actually my scanner has three wires yellow, red, and black.(constant, switched +, and ground respectively) Everyone on here is suggesting to switch by the ground, but this one has changable patterns and memory so the same pattern stays when switched off. the only thing i saw was a relay in another post that may work, but im not sure. Thanks for the help though.
Big Dog 
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Posted: April 17, 2007 at 9:38 AM / IP Logged  
If the scanner requires a positive signal on the yellow for it to scan then inverse the switched positive to negative input using a transistor or relay and then either use the brown ACC of the car as mentioned above or to the constant groundout of the aftermarket security system.
If using a relay, make sure it isn't active to enable the scanner.
Instead of rambling on, I'll ask: Does power on the yellow enable or disable the scanner?
Prepare your future. It wasn't the lack of stones that killed the stone age.
customcutlass92 
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Posted: April 17, 2007 at 10:35 AM / IP Logged  
the yellow is for memory, so it stays at the same pattern when it turns off and back on. i can find a place for that, but i need a wire thats on only when the car is off for the red wire.
customcutlass92 
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Posted: April 17, 2007 at 10:40 AM / IP Logged  
i should have mentioned above, the red and black wires alone will turn it on, but it has no memory without constant power(yellow).
Big Dog 
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Posted: April 17, 2007 at 10:41 AM / IP Logged  
OK, because the scanner requires a positive signal on the red for it to scan then use a relay.
Connect the red of the scanner to pin 30.
Connect pin 86 to an ACC or IGN.
Connect pin 87a to B+.
Connect pin 85 to ground.
The instant the key is off it will scan.
Prepare your future. It wasn't the lack of stones that killed the stone age.
customcutlass92 
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Posted: April 18, 2007 at 11:18 AM / IP Logged  

Thanks! Is there any specific type of relay i should look for? I dont know much about them.

Big Dog 
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Posted: April 18, 2007 at 11:24 AM / IP Logged  
Go to any automotive store and get a standard Bosch type relay. Make sure it's not a fog light relay with two 87 pins. Your relay should have a N.C. contact identified as 87a and a N.O. contact identified as 87.
It'll look like this:
RELAY
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customcutlass92 
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Posted: April 18, 2007 at 11:42 AM / IP Logged  
Will Do! I'll let you know how it turns out. thanks again.

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