2005 Montana security light

I had one previous post regarding my power door locks , which I haven't had time to look at yet. My install went well and everyting WORKED, but now, about 4 days later my passkey3 security light has come on.

Everything is working , parking lights, fan blower motor,  etc; on remote start, there are no other warning lights, transmission or shifting problems, if I start my van with key ONLY there are no warning lights, and everything is normal.  If I remote start and then insert the key , the light still stays on.The only thing that makes the light go away is to turn off the van (either by pressing the remote button , pushing  the brake pedal or turning the key to the off position).

Could the computer know that there is something not quite right ,could there be a diode required somewhere(if this was the case wouldn't I have had a warning light from day 1?)  Like I said, it worked fine for 4 days and now this, I don't mind a light ,and I'm pretty sure that I'm not going to fry anything, but maybe someone here can help.

It's a 2005 Pontiac Montana with no factory alarm system. I used a ct-3300  R/S with a DEI 555G bypass module, no other aftermarket accessories or any special gadgets. I did NOT use any diodes or relays in this install ,only the 2 modules and their respective wires as shown in the "direcwire" schematic. I double checked my connections (yes they are all soldered and taped), and they're still all good (other wise the R/S wouldn't still be working, right?).

Thanks again.  Don.

I forgot to mention that when trying it last night, about 8 times,  I just remembered that the warning light came on every time except once ( on that one occasion I think I just put the ignititon key next to the cylinder (without actually putting the key in)and the security light went out) . Which means you're probably right.

When you say you have had good luck with the 555u,  does this mean you NEVER have the security light come on?

Just for curiosity why would the light come on?,  any theories?,  does the computer see two transponder signals at once ?, is there a timing problem when the R/S or bypass module(s)  are activated?Also

Are there any long term effects for  this problem as far as driveability ,electrical problems  or anything else other than an annoying dash warning light? 

 Where can I get a 555u and how much? I'm located in Montreal, Canada.

 The security light is on as soon as I start the van by R/S and will stay on as long as I leave the van running.The light doesn't just come on as the ignition key is inserted into the cylinder; this is what I think you mean by  "take over", it's already on before putting the key in ( sorry if I seem repetitive, I'm making sure I'm as clear as possible). I forgot to mention that when trying it last night, about 8 times,  the warning light came on every time except once ( on that one occasion I think I just put the ignititon key next to the cylinder;  without actually putting the key in, and the security light went out) .

When you say you have had good luck with the 555u,  does this mean you NEVER have the security light come on?

Just for curiosity why would the light come on?,  any theories?,  does the computer see two transponder signals at once ?, is there a timing problem when the R/S or bypass module(s)  are activated?Also

Are there any long term effects for  this problem as far as driveability ,electrical problems  or anything else other than an annoying dash warning light? 

 Where can I get a 555u and how much? I'm located in Montreal, Canada.

Thanks for a quick reply, Don.

So sorry about the double post.

Please ignore the first one since I added more information in the second posting.

Don.

I just bought a 555u and a pk3 key blank on Ebay for 52 dollars (CANADIAN) for both. I called the GM dealer and he told me 57 dollars, plus tax just for the key , and 50 dollars for the 555u from Best Buy online.

 Why is everything so damned expensive here in Canada?

I''ll give this combination a try  when it gets here and I'll keep everybody posted.If it doesn't work I'll have some  parts for sale!

I just finished an 03 montana and used the new gm by pass from canadian tire it plugs into the rs 3300 and all u do is hook up the data wire to the purple data wire on the obd2 connector and it programs itself . works great             Gm-DT1000 about $48

Thanks for all the replies, I have to  wait for my 555u seeing that I just ordered it yesterday.

BRUC007, how long ago did you do this particular install, could you let me know if your security light has or will come on within the next few days until I get my stuff. I wish I had waited a day or two , then I could have tried your set up.  Ahh well... , live and learn.

 By the way does anyone think I will have any problems with the 555u on my Montana.