freddofrog
won 16.4k on Euro lottery :)
aha, yes that's exactly what happens when the siren battery voltage is low but the main car battery is fully-charged, the siren mis-communicates with the MICU and also with the ultrasonics, you have to leave the engine running, shut the doors, and wait about 20 mins for the siren battery pack to reach operating voltageNala Nesnej said:Thanks for the reply Brian. What you say seems to add up. I left the car standing for a week last week, and when I came to start the car, the battery was totally dead - which indicates a dodgy battery. When I went home last night the siren went off. I set off for home expecting the siren to sound again, but it didn't, and today it's behaving itself, so maybe it's charged itself. Still a bit confused as to why the ultra sonics set the alarm off though. I'll wait and see what happens.
the "bell box" at my house is the same, if there's a power cut, the "bell box" starts to wail