trunk trigger always tripped

All the paperwork i found about this cars trunk trigger said that it was negative but i found the ORANGE / black wire at bcm connector c1 and measured it.  It is indeed positive.  I tested it over and over closing and opening the trunk and it worked.

I left the BCM disconected for about a minute to see if it would clear and it seemed to help a little.  it seems really random when the trunk trigger will trip now.  Sometimes it goes for a couple of hours okay and then sometimes it doesn't.  I'll try to check the door triggers and see if i can disconnect them and see if that helps.

Thanks for all the help so far!

Hey,

I've got the HT800 also, just installed it, on an 2003 Impala, I think I have a similar BCM.  I also started getting trips on the doors and trunk triggers after a set amount of time.

I've determined that while the BCM is powered on, for whatever reason, it will read positive voltage, that's why you need to diode isolate your alarm, so it sees an open circuit regardless the 12VDC.  Once you power down your car, the BCM powers off slowly, and that's why it'll begin tripping after a certain amount of time(random, dependent on some other factors).  I measured the BCM while it powers down, and over time the resistance to ground increases, which is causing our random tripping.

I haven't done so, but I will try diode isolating the BCM in the same way we did multiple triggers, so that the BCM grounding will not ground any other trigger wires. 

The door and hood triggers seem to act the same.  When you disconnected your trunk trigger and it kept triggering, are you sure it wasn't he door trigger that went off?  Look carefully on your remote, it should display the doors, it's hard to see but it's there.

I'll let you know how the diode isolation works.

Hey,

The diode isolation seemed to work!

Last night I tried a resistor in line, 56Kohms, it allowed the BCM to partially ground, and not trip the alarm, and allowed the door opening(grounding) to trip the "door open" on the alarm, but after 1.5 hours, the alarm's resistance to ground must have increased as the capacitors drained, and it started tripping again, that's why I went to diodes.

I put in the diodes tonight, and I am having no tripping of the alarm due to trunk or doors.  I've only had the car off for 1 hour, but since it's diodes, I don't think the slowly increasing grounding of the BCM will cause it to trip.

I'm surprised there was no mention of diode isolating the BCM from the triggers in any of the install manuals I used.  Maybe it's just a design fault of Chevy BCMS? 

Hey, that may have solved my problem, but hasn't yours worked for 1 year, and it just began tripping?  Maybe it's something we did to our BCM's. 

Any expert advice on this?

Wow, that's good customer service!  Good to see, they are tryign hard to make a good product and support it as well. 

I didn't diode isolate the ground wire on my BCM.  I meant diode isolate the BCM triggers.

What I meant was that I diode isolated the door trigger wire on the BCM from the driver door and passenger door triggers.  In the same way you diode isolate the driver door trigger from the passenger door trigger.  So you just have to cut the driver door trigger to the BCM, and put a diode in there so negative current can flow into the BCM, then do the same thing for the passenger trigger.  And then finally, do the same thing for the trunk trigger. 

I just got through an entire night of sleep with the alarm armed, and nothing had gone off.  In the morning I just hit the start button and it started up!  So everything works well now. 

I think i have the 800E, so revision E version, I think you're using D, shouldn't be too different though.

Did you install those different alarms into diff cars?  What problems did you have?

It's not a bad alarm, the only problems I have with it, is that you cant' disable the parking light warning flasher, when you open your doors.  And you can't change the remote start time from 8mins to anything else.  Maybe I should ask if there's a setting for this that isn't listed in the book?

Otherwise, great alarms, and great range.  I'm going to try using an iwind surf antenna thing to boost the range of mine.  It's a directional antenna mod made for 802.11b networks, might work.

http://www.freeantennas.com/projects/template2/index.html

There's the web page where you can get the template for the directional antenna.  Might be a great way to improve operating range, probably not practicle for auto use, but might help even on the remote side of things.  Worth a try if your appartment is far away from your car, and you still want contact, I think you could just put the remote into the center and it'll direct the signal accordingly.

COOL! Great to hear!

I was beginning to regret that I didn't purchase the starter with an alarm, where you could set a time to start the car, and change the start times.  But if this one can increase start times above 8 mins, that would be perfect!  The other alarm could even sense temperature, and keep the temp above a certain temperature!    I don't need that though, but I'm sure that'd be handy in certain places.

Looking forward to the info!