Avital Avistart 3200 Trunk Release

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=18665
Printed Date: May 16, 2025 at 5:21 AM

Topic: Avital Avistart 3200 Trunk Release

Posted By: Spacepiston
Subject: Avital Avistart 3200 Trunk Release
Date Posted: September 08, 2003 at 6:25 PM

I seem to be in a bind. I dont understand what the problem might be with my setup. I have a 95 Grand Prix

The target wire is a BLACK/ WHITE at the trunk release switch. You will need to give this wire a momentary ( + ) signal. If your alarm / remote starter does not have a ( + ) output trunk release wire, you will need to install a relay that chages polarity. Wire up a relay like this:

86 + 87 - 12 Volts Constant
85 - trunk release wire form alarm or remote starter
30 - BLACK/ WHITE trunk release wire of Grand Prix

I have wired my SPDT Bosch Relay according to this information. The problem that is occuring seems to be not enough negative pulse from the control box. Im using the correct wire, and it works properly with the remote. I get a negative signal when I press the trunk button, but it doesnt seem to be enough of a negative signal? When the RED / white wire from the remot starter's control box is activated, it will drop the voltage from ~12.7 to ~10v. Does this seem right? when I ground the terminal out on a screw the relay clicks no problem, but nothing happens no matter what from the negative pulse from the remote starter, accept a slight voltage drop which isnt enough to pull the contact.

Do I have a defective box? Is it somehow not completely grounded!?! I dont see where my problem lies since the remote starter, and the remote entry works just fine.

Replies:

Posted By: c2deez
Date Posted: September 08, 2003 at 9:28 PM

Most relays require a very small amount of current to engage the contacts(usu less than 150ma) most alarm outputs are ~500ma. When you disconnect the 85 terminal and ground it does the trunk release engage? If not you could have the wrong target wire; if it does then you can add a 2nd relay to increase the ground output from the alarm--but like I said relays don't require a great deal of current at all. Check the pin cnx on the relay, make sure the alarm out is going to 85 and not 86. Some Bosch relays have an internal diode across the coil and that would mean that 85 must see 12v- and 86 must see 12v+.
Hope this helps.

Posted By: Spacepiston
Date Posted: September 09, 2003 at 3:44 PM

c2deez wrote:

Most relays require a very small amount of current to engage the contacts(usu less than 150ma) most alarm outputs are ~500ma. When you disconnect the 85 terminal and ground it does the trunk release engage? If not you could have the wrong target wire; if it does then you can add a 2nd relay to increase the ground output from the alarm--but like I said relays don't require a great deal of current at all. Check the pin cnx on the relay, make sure the alarm out is going to 85 and not 86. Some Bosch relays have an internal diode across the coil and that would mean that 85 must see 12v- and 86 must see 12v+.
Hope this helps.

Believe me, I have the correct wiring. But the internal diode interests me. The trunk release pulse wire is like 150ma. I THOUGHT I had the right relay, I got it from Parts Express a 12VDC Automotive Relay SPDT 30A.

Yes if I ground terminal 85 it does engage the relay..so is it possible the relays I have been getting have this diode which requires 12v- to engage? Because like I said the negative signal from the trunk wire is absolutely not doing what I expected it to do...

Posted By: Spacepiston
Date Posted: September 09, 2003 at 5:40 PM

and if for some reason im not getting enough ground how would I incorperate a 2nd relay to do that?

Posted By: c2deez
Date Posted: September 09, 2003 at 10:45 PM

Sorry about the confusion 12v- is just ground. As for the second relay:

87--Ground
86--12v fused constant
85--Connect to r\s trunk release wire
30--pin 85 of first relay

As far as the internal diode, as long as 86 is 12v+ and 85 12v-, you should not need to worry.

Posted By: Spacepiston
Date Posted: September 10, 2003 at 7:54 PM

The problem I have is this. I wire it according to what is stated above. I test the RED / white trunk relay wire from the unit, and it reads ~200MA and up to 500ma. When I test terminal 85 before attatching the RED / white wire, it reads 12.5v. After attatching the RED / white wire to terminal 85 it reads about 11 volts.

I thought that a difference in voltage between terminal 85 and 86 was supposed to close terminal 87 and allow voltage to pass through terminal 30 to the trunk. But nothing happens. Only a complete ground to the chasis will activate the relay. This is the relay I bought: https://www.partsexpress.com/pe/showprod.cfm?&DID=7&CAtid=47&ObjectGroup_ID=31

Item number 330-073

Is this relay the right type? I thought it was...let me know ok? thanks!

Posted By: StealthEs
Date Posted: September 10, 2003 at 8:33 PM

How long are you holding the trunk release button down for. Same thing happened to me awhile back. The Button needed to be press for about 5 sec's then the release worked. Also are you sure you dont need to isolate the wire from the switch?

-------------
Cris

Posted By: c2deez
Date Posted: September 10, 2003 at 9:30 PM

That's the right relay, either try what ES says or use a 3rd channel or some other "instant" output, from the alarm, to test the relay.

Posted By: Spacepiston
Date Posted: September 11, 2003 at 2:02 PM

I set the computer to keep the pulse going until I turned the ignition on so that the negative signal was constant (for testing purposes). But yes before I did that I had to hold the release button down for like 3 seconds for the remote to activate the signal.

Im not sure what isolating the wire from the switch woud do...the switch is just a push-button that connects the constant 12v to the wire that goes out to the trunk...so when the switch is not being pressed it pretty much is isolated.

I just dont understand how I can be reading 11 volts on terminal 85, and 12.5 volts on 86, and yet the relay contacts dont move. I guess I will see if I have another wire I can use to activate the relay....

Posted By: floaterr
Date Posted: September 11, 2003 at 3:28 PM

reverse 85 and 86. If that doesn't work then the output might be blown.

If you want to test again hook it up to the factory disarm or door lock unlock output. Something like that. But sounds like the output was damaged or mayeb even the relay is malfunctioning and requiring to much current. You do have the right one.

Posted By: Velocity Motors
Date Posted: September 12, 2003 at 4:51 AM

Your relay may be faulty as well ( sticky pole ). Have you tried another relay ?

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

Posted By: Spacepiston
Date Posted: September 13, 2003 at 12:47 PM

Velocity Motors wrote:

Your relay may be faulty as well ( sticky pole ). Have you tried another relay ?

yea I bought 2 relays...at first that is what I thought.. but now im convinced that the channel is faulty, and that it wont be possible to use the trunk release due to that factor...even though I get a 200ma+ signal from the wire...it simply does not do anything once it is hooked up to the relay. Ive trouble-shot it for hours and hours.. when I feel like it again, maybe I will look to see if there is another wire that could be used to control the trunk thats not defective.