Car alarm issue Toad Ai606

Cyber-Mav · 3 Feb 2024 at 19:19

Got an issue with the alarm system. when arming and disarming it no longer makes the chirp noise but when alarm is triggered via door entry etc the siren does make its usual alarm noise.
Now the siren just keeps making this glitching noise as iv filmed it in this video:

Toad Ai606 Siren issue

Issue with alarm system. when arming and disarming it no longer makes the chirp noise but when alarm is triggered the siren does make its usual alarm noise.

youtu.be

This noise started yesterday, the car has been on charge for 2 days on the Lidl ultimate speed smart charger, not sure if the issue is related but i did have the car on this charger last year too and no issues. not sure what to do.
Anyone old enough to have experience with this? Alarm was fitted in 2002 and it never had any issues till now

Cyber-Mav · 4 Feb 2024 at 11:19

Its not been making that noise all night, checked today still no noise. Not opened the car yet to trigger siren will test when i get back home. Thinking i should leave battery disconnected for a few hours and see if it makes a difference

Cyber-Mav · 4 Feb 2024 at 13:33

I dont think this has battery backup, im sure it was an optional extra that cost more and i didnt take that option.
One thing to note is when it was making that noise in the video tue siren was also warm to touch.
Proper tired out at the moment will disconnect battery tomorrow and leave it off for most of the day and then test it all out

Cyber-Mav · 4 Feb 2024 at 13:36

5abr3 said:
I can't tell 100% from the wiring diagrams I can find with a cursory Google (as they all only appear to show only 1 wire to the sounder); but if the sounder is driven via a relay then you might want to try swapping the relay with a new one if you have one handy.

A sticking armature would explain a constant low signal and a still working output and it going away intermittently after physically moving the relay (door closing can be enough) or activating the driver to the relay.

Hopefully you have a better wiring diagram than the one I kept finding or happen to know if it is relay driven or not otherwise this may be a bit of a wild goose chase...

From what i can see wiring wise the siren has one cable that goes from it to the alarm box unit thing. The cable is supposed to have 4 wires in it, one for power and ground and 2 that handle the digital signal to trigger the siren noises.

Cyber-Mav · 4 Feb 2024 at 14:37

I put the effort in and took the battery out. When i unlocked the car i didnt get any chirp from the alarm started car fine also able to activate alarm panic sound so siren deffo makes alarm sound but noticed that it was making that glitch noise again as in the original video.
Will leave the battery off for a few hours and see how it goes. Failing this my options will be limited, dont think there is any support or parts available for these old alarms. Immobiliser still works just siren issue so maybe I can disconnect the siren not sure.

Cyber-Mav · 4 Feb 2024 at 15:01

took the siren out and got some pics up here. i think i see where the issue is:

gonna have to clean this up and see what the extent of the damage is. im ok with smd component soldering but will take this slow and steady, will focus on cleaning up the mess first and assessing the damage hopefully someone like @Vince would be able to assist in this. i doubt i can get a replacement siren. i didnt know this model had batteries in it, unless they died out many years ago.

my theory is the batteries died causing high leakage making mosfets stay on all the time to charge the batteries and burning out the fets.
the batteries in my celica siren leaked out but i was able to clean it up and run the siren without battery in it and it still works just doesnt sound off when the main car battery is disconnected.

Cyber-Mav · 4 Feb 2024 at 15:53

Left it in the bedroom while i went to eat, wife complaining about burnt electronics smell lol.

Toad AI606 Now Obsolete

The Toad AI606 / AI606 T2 is completely obsolete now meaning we can no longer supply and fit this system. why not take a look at the Sigma S30 Thatcham Cat 1.

www.autodefence.co.uk

Doubt i can get a replacement siren. Dunno if scrapyards will have any too.

Cyber-Mav · 4 Feb 2024 at 17:08

some more pics of the damage here:

not looking good.

Cyber-Mav · 4 Feb 2024 at 21:18

gc123 said:
usual with battery back ups its a cat one thats why i was surprised you said it didnt have it. damp get in , was going to suggest if you dont need the cat one just remove the battery pack.
i did have a quick look after i posted to see if i could find one (sure i had a siren in the shed for one but would doubt the battery pack up to much ,) i will have another look later in the week.
4 wires , live, earth , coded, and pin switch wire its incorporated in the siren harness for the bonnet.

if you have the same siren it would be awesome. if you could take some pics of the inside some of the resistors are single black band that means 0 ohms but 2 seems to be burnt and cant see the bands on them. will take components off the board tomorrow and see where im at with this. after the cleanup it doesnt look like any traces are damaged and its just burn marks on the board and components.

Cyber-Mav · 5 Feb 2024 at 10:17

adam cool dude said:
Cannot help but my Celica GT-Four also has a Toad Ai606. Would always go off in the middle of the night because I suspect it was a battery drain and not very helpful when you don't drive the car daily. Now it is tucked up in the garage on a trickle charge it never goes off.

probably a massive ask here but if its got the v1 siren square type (v2 is round) would you be able to take a pic of the circuit board for me? also its bes to remove its internal battery to be on the safe side so you dont get the same issue i did.

Cyber-Mav · 5 Feb 2024 at 10:39

more pics after desoldering stuff, zener diode is toast its broke in half so not sure what to do there. the 2 burnt out resistors seem to both have the same resistance of 100ohm so maybe they are 100 ohm or they both got cooked to the same temp to give same wrong reading? not sure there. some trace damage too looks like a single layer board so not sure now.

Cyber-Mav · 5 Feb 2024 at 10:59

adam cool dude said:
Just checked and mine is the round one unfortunately. Otherwise I would be more than happy to help.

thanks for checking. i wonder if the round type v2 siren will work with my ai606. iv dropped toadalarms an email hopefully i get some info from them.

Cyber-Mav · 5 Feb 2024 at 11:42

odd it does have sensitivity adjustment for ultrasonics. for people that had it randomly going off its usually down to dodgey door, boot or bonnet switch when car gets hit by wind it may trigger a flaky switch to go off.

Cyber-Mav · 5 Feb 2024 at 12:25

gc123 said:
was going to say if i cant find the unit , i have got several cobra battery back up units either complete or in bits and im pretty sure in the day we would swap internal components over just looking at your pictures they look very similar. it really depends how far you want to go into it as clearly its past its best but some like originality.
if you have disconnected the battery pack and the unit still works ,i would probably cut out the damaged components and just use it minus battery back up atm.

it was glitching with the dodgey noise and draining car battery. looks like your my last hope, let me know if you find a toad siren. not sure how much faffing would need to be done to get a different model siren to work if it involves messing about with the actual ai606 brain.

Cyber-Mav · 6 Feb 2024 at 11:36

Nomisf said:
Given that PCB is down to the fibreglass weave, make sure you liberally apply something to neutralise the chemicals from the battery. In my experience if they have soaked into the board they will continue to slowly cause corosion unless completely neutralised.

yep will do. surprised how much heat the boards can take, didnt know they were made of fiberglass, always thought it was some sort of thermoplastic.

Cyber-Mav · 8 Feb 2024 at 15:40

removed the sticker of the small chip and its got some markings on it:

12C508A
04/P01V
0113

maybe if i can find a datasheet for this it may give schematic info of whats supposed to be connected to it and how?

Cyber-Mav · 8 Feb 2024 at 18:05

hmm i need to read the code from this chip and see what its doing then can get an idea of the circuit its controlling and progress from there.

waiting for the other sirens to arrive too so covering this from different angles.

Cyber-Mav · 8 Feb 2024 at 18:34

i understand. thought i could use the code with a circuit simulator.
the datasheet is a good start though.

Cyber-Mav · 9 Feb 2024 at 22:39

from what iv read up on this, the sirens are not coded as such to be linked to the main alarm brains hence why swapping the siren for a working one will work fine. too much old stuff wearing out. iv been saying it for years but this summer i will deffo get the ecu out of the car too and check for any dodgy capacitors and replace. car is now 29 years old so.....