ok never heard of this before

99 ( s1.5 ) au xr6 manual
the dash will beep at startup
5 beeps and a set of 5

ie beep 5 times, pause beep 5 times, pause beep 5 times, pause beep 5 times, pause beep 5 times

no frigging idea!
now it it only does it when the cabin is warm! and not all the time it is intermitent
maybe 50-60% of time ?

any one help
cheers

sounds airbag related at a guess, when you read the "sticker" thing on the sun visor there is mention of 5 groups of 5 beeps, is the airbag light on the dash working when this happens?