help/Advice - alarm reset

[bluemalbert]

MGZT Facelift 2.6
morning all - im hoping for some guidence here! Alarm sounding this morning for no apparent reason. No previous similar issues with this.

1. alam sounds
2. Key fob inactive.
3. internal master locking switch inactive.
Action taken:

1.Disconnect battery, both terminals.

alarm still sounds for a mo but then reduced to a clicky clacking sound! (technical term!) which has eventually died over the last hour.
2. Check plenums for water etc. Bone dry - no rain for 6 weeks!
3. Connect battery - Alarm sounds again.
4. Diconnect battery and disconnect sounder multiplug. remove sounder with view to a battery replacement.
5. Connect main battery again, still no fob action c/locking.
also, ignition on - dash lights dim so battery now on charge - in case flat.
With ignition on , no electrical activity at all, not even enough to activate the electronic boot switch. Battery totally fine at 10pm last night!


now the sounder is in the house its started clicking again!! Could it be flat sounder battery and warm house revitalising the battery a wee bit?



Only background worth knowing is that I replaced a seat cover last week so had the seat out and battery off for 2 weeks. no issues after, have driven etc. all good.

[clf]

Originally Posted by bluemalbert

MGZT Facelift 2.6
morning all - im hoping for some guidence here! Alarm sounding this morning for no apparent reason. No previous similar issues with this.

1. alam sounds
2. Key fob inactive.
3. internal master locking switch inactive.
Action taken:

1.Disconnect battery, both terminals.

alarm still sounds for a mo but then reduced to a clicky clacking sound! (technical term!) which has eventually died over the last hour.
2. Check plenums for water etc. Bone dry - no rain for 6 weeks!
3. Connect battery - Alarm sounds again.
4. Diconnect battery and disconnect sounder multiplug. remove sounder with view to a battery replacement.
5. Connect main battery again, still no fob action c/locking.
also, ignition on - dash lights dim so battery now on charge - in case flat.
With ignition on , no electrical activity at all, not even enough to activate the electronic boot switch. Battery totally fine at 10pm last night!


now the sounder is in the house its started clicking again!! Could it be flat sounder battery and warm house revitalising the battery a wee bit?



Only background worth knowing is that I replaced a seat cover last week so had the seat out and battery off for 2 weeks. no issues after, have driven etc. all good.

I am not sure if this will be the issue, but check the fuse 31 (I think). My own BBUS (Battery Back-Up Sounder - your alarm) had corroded internally badly, without any sign of water in the plenum.

When I first got the car, the BBUS did not work (nor the headlight washers - which turned out to be the pump). However the remote locking didnt work properly either. The remote locking was repaired by a fuse replacement (31 I believe), but I do not know if the failed BBUS blew the fuse, and caused the secondary issue. So I wonder if you check the fuse for the alarm sender, would it fix your locking. The BBUS should operate normally I believe if it isnt faulty of course, and charge the battery.

Dont waste effort to replace the batteries, even if you can (they are sealed units), when you can get a replacement for some BMWs for £10-15 on eBay.

[bluemalbert]

[QUOTE=clf;2812525]I am not sure if this will be the issue, but check the fuse 31 (I think). My own BBUS (Battery Back-Up Sounder - your alarm) had corroded internally badly, without any sign of water in the plenum.

When I first got the car, the BBUS did not work (nor the headlight washers - which turned out to be the pump). However the remote locking didnt work properly either. The remote locking was repaired by a fuse replacement (31 I believe), but I do not know if the failed BBUS blew the fuse, and caused the secondary issue. So I wonder if you check the fuse for the alarm sender, would it fix your locking. The BBUS should operate normally I believe if it isnt faulty of course, and charge the battery.

Dont waste effort to replace the batteries, even if you can (they are sealed units), when you can get a replacement for some BMWs for £10-15 on eBay.






Hi - ive got the BBUS off and checked inside, its pristine so no water, but could be faulty i guess.

[clf]

Hi - ive got the BBUS off and checked inside, its pristine so no water, but could be faulty i guess.[/QUOTE]

My suggestion is not a definitive solution, it is a hunch that I have.

BBUS becomes faulty, blows the fuse, then as it is linked on my car to the central locking, that too fails. (just checked, on my car which is a facelift ZT, the fuse that failed was no.36 - I actually found it was blown, as in desperation, I removed and checked ALL of the fuses. Once replaced with a good fuse, I had to disconnect the battery for it to become fully operational again.

As I said, it may not be your issue, but it would rule out the fuse anyway (as well as dispel my hunch, and it is free to find out lol).

[bluemalbert]

The plot thickens! I have replaced the main car battery, the cent locking has started working. The BBUS is still in the kitchen! all fuses are good,

[clf]

Originally Posted by bluemalbert

The plot thickens! I have replaced the main car battery, the cent locking has started working. The BBUS is still in the kitchen! all fuses are good,

Start the car, and then switch off, does it still work? When I disconnected the battery, the remote locking would work (central locking always worked when using the console switch), once, until the car was started, and then failed again. post 32 on another forum is where I discovered my answer.

[bluemalbert]

So, in continuation, the car has run fine since the last post with the BBUS box off the car. When I try to refit it, on connecting the plug, the alarm sounds. Is there a protocol to refit the sounder does anyone know?

Sent from my SM-J730F using Tapatalk

[clf]

Originally Posted by bluemalbert

So, in continuation, the car has run fine since the last post with the BBUS box off the car. When I try to refit it, on connecting the plug, the alarm sounds. Is there a protocol to refit the sounder does anyone know?

Sent from my SM-J730F using Tapatalk

Yes.

You disarm the alarm before removing the siren, or apparently it will not go silent until the built in batteries die. When reconnected it will start wailing again (as you have found out) - as it has a power source.

Replace the unit

https://www.ebay.co.uk/itm/Bmw-E36-A...gAAOSwh7tcRz-j

https://www.ebay.co.uk/itm/BMW-E65-E....c100005.m1851

https://www.ebay.co.uk/itm/BMW-Mini-...wAAOSwMtxXvGSE

others are available HERE

It is the one that looks the same as your own. The BMW items from what I can gather are well protected and will likely work fine.

Incidentally, this was how mine looked when I opened it up after removal. From the outside it was dry and clean, and no obvious signs of water ingress in the plenum.





Does the central locking still operate, after the battery replacement?

[Mike Noc]

Originally Posted by bluemalbert

So, in continuation, the car has run fine since the last post with the BBUS box off the car. When I try to refit it, on connecting the plug, the alarm sounds. Is there a protocol to refit the sounder does anyone know?

Sent from my SM-J730F using Tapatalk

The protocol I followed was lift bin lid, throw BBUS into bin, and then close lid. Job done.

[bluemalbert]

Originally Posted by clf

Yes.

You disarm the alarm before removing the siren, or apparently it will not go silent until the built in batteries die. When reconnected it will start wailing again (as you have found out) - as it has a power source.

Replace the unit

https://www.ebay.co.uk/itm/Bmw-E36-A...gAAOSwh7tcRz-j

https://www.ebay.co.uk/itm/BMW-E65-E....c100005.m1851

https://www.ebay.co.uk/itm/BMW-Mini-...wAAOSwMtxXvGSE

others are available HERE

It is the one that looks the same as your own. The BMW items from what I can gather are well protected and will likely work fine.

Incidentally, this was how mine looked when I opened it up after removal. From the outside it was dry and clean, and no obvious signs of water ingress in the plenum.





Does the central locking still operate, after the battery replacement?

Ok. but the differences are:
1. The siren box is pristine inside - as new.
2. The alarm must be disarmed as the lights are not flashing and the immobiliser is not actioned
3. the battery on the siren box BBUS has dead batteries
But it still wails when connected.