Ok, seeing as there’s an existing topic I’ll try putting this on here.
For all the months the car’s been in my garage getting worked on I”ve had the battery on or off as needed - no issues as far as I could see, and I wasn’t always as good as I should have been about following the ‘igntition off, disconnect within 30 secs’ procedure. Still, no issues.
Took the car for its MOT, and when I collected it there was an “alarm fault” message on the display - but it didn’t seem to cause any particular problem.
Running about in the car today it seemed a little ‘sluggish’ sometimes on responding to the lock/unlock on the key fob (new battery about 8 months ago - buttons barely used since).
Then at one location I’d left the car unlocked while chatting to someone - maybe 15 minutes - came back and it was immobilised. Jumped out, lock/unlock, and it started.
Got home, plugged in the nano and cleared the alarm fault.
But….. what’s going on? What did my MOT tester do? I’ve had the immobiliser thing kick in before too, but it spent days ‘powered up’ in the garage, and unlocked, without having an immobiliser fit…? Puzzled, me.
Edit - meant to ask too. I’ve read something, somewhere about the alarm sounder being nicad powered, and that these can die. What’s the real story?