Alarm battery upgrade on 360 - killing the red dash LED :-)

The boards that use the two round batteries about 20 mm diameter and about 10 mm thick seem to have fewer problems with upgrades than the boards with the stand-up computer M-B style batteries.

It's always a crap shoot.

However, that board is very polarity sensitive. So if you even briefly touched an wrong polarity you toast the board

 

Another data point: 15213135 was $115, an independent sourced it for me, it's installed and chirps correctly for lock/unlock.

 

WTH?? Went to pull the car out to give it a wash and now the alarm works just as it should. Beeps for locking/unlocking and the alarm goes off, no red light on the dash. Haven't changed anything else since yesterday and car sat through the night with the disconnect turned on. Not complaining here but I would like to know what changed and what exactly solved my problem.

 

sorry guys if this has already been asked but can i unplug the siren without having to cut the battery / turn off the master switch? will there be any issues?

can i use the car with the siren unplugged? will it affect the alarm ecu?

 

Yes, you can unplug the siren without having turn off the battery switch.
And yes, you can use the car with unplugged siren, red LED will be on permanently.
There is no issue with the Alarm ECu at my car....

 

thanks....any particular reason why everyone who performs this (removing the siren) kills of the car's master switch/batteries? then there is the whole process of switching turning on the batteries and making the car relearn its parameters right?

 

I need some help on this: I did the GM part replacement.
My siren sounds, which is great.

Now the not great: it also sounds when I disconnect the car battery! So I can't use the cutoff switch without waking the neighbors and making my dogs bark.

Anyone else had this happen to them?

 

Yes I have. Also used the GM part and didn't discover this until I went to put the car away for the winter. Car locked, front hood open and turning the disconnect off triggers the alarm. Had to leave the disconnect on and battery tender plugged in.

 

Ugg. Thought about putting a cutoff switch on the harness and then it hit me...there's no power. Duh.
GM service manuals probably have something on how to turn this off.
In a boring all-day meeting, so I guess I'll google around.

 

Ok so I found one suggestion, but I do not know if this works.
I'm on the road and won't be able to test this for a few days.

In any regard, here's what I found:
1) hit immobilizer button
2) insert ignition key & turn to second position (not all the way to ignition)
3) rotate the key back to zero, but do not remove the key
4) then disconnect the battery
alarm should not sound

Anyone want to try it?

 

Tom- The siren is hot-wired around the cut-off switch, so that is what you are probably getting and the Vette siren may be wired a little differently. Designed so someone could not drain the battery (C4 Corvettes were stolen that way) and make the alarm inop.

Why do you want to use the battery disconnect switch that often, at any rate? That is largely for your techs and not really for frequent use. Put a battery maintainer on her instead of using the disconnect switch. Everything will be happier. Also, one of those small computer memory savers with a 9 volt battery that fits in the cigarette lighter might cure that, too, and prevent having to do a drive cycle.

 

Why? I work on my car a lot. Planning to add a subwoofer amp soon. Don't want ear plugs.

Doesn't make sense that it's hot wired around the cutoff. Then why have the batteries?

 

Tom- Of course it makes sense that it is wired around the disconnect switch. Keeps the alarm battery charged if you shut her off with the disconnect switch over the winter. Not that I recommend that. The little $10 or so memory keeper with the 9 volt battery might be just what you need. Prevents making the system have to do a relearn every time you shut her off and might cure the siren sounding off.

Understand now why you shut her off frequently.

 

what is this $10+9v you speak of, Taz?

 

Tom- It maintains the memory of the radio, Motronic ECUs, etc, if you disconnect the battery. There are other, more sophisticated and expensive devices that hook up through the OBDII connector, but the price is right on this one.

CTA Tools 3002 Computer Memory Saver - Mechanics Tool Sets - Amazon.com

 

Ok that's pretty simple. I could Macgyver one and hook it up to my battery keeper hookup. (Wonder though if putting a 9v battery in parallel with a 12v car battery would be a Big Boom...)

 

Nevermind, clearly it would be on the wrong side of the cutoff switch. Cig lighter socket it is!

 

Hi Guys! Just installed the GM siren on my f355. Sweet, but every time i turn off the master switch my neighbors dogs bark too!!! Same as Toms. Maybe its the dogs i need to silence! Anyway id sure like to know the work around this as i dont get to take my beauty queen out very often and some advice would be most appreciated..How about the fact that if the keys are in the ignition,after 5mins she locks the doors! Lucky me!

 

Andy, a "computer memory saver" does seem to work.
Thanks to Taz for the pointer!
Tom

 

Thanks for the update Tom! Well done Taz! Ill grab one of these and give it a try. It will be plugged into the car and if that doesnt work ill plug it into the dog! Ha,Ha ;-)

 

What happens if you pull the unit? Will the car run as it would with dead batteries.i.e- constant red led?

 

By "unit" I assume you are referring to the alarm module?

Should but the door locks may not work

 

With the siren unit out, my car door locks still works as normal.
BTW the sirens are available because I just bought one from the GM dealership for $100 CAD.

 

I heard with the GM the alarm with sound with any power disconnect.is this true?

 

I haven't tried it yet but I suspect that's true. Can tell you the GM siren will not activate when the car is in alarm mode. Lights flash, no siren. But no red light on dash and chirps with remote is well worth the money.
I have taken apart my old oem siren and plan to repair the board. The GM siren is a great interim solution.