Usual three lights

I'm sure this has ben covered, but I can't find my exact problem anywhere, basically the vehicle has been sitting for around a year before I bought it. When I start the engine the usual ABS light is on, then after around 20 seconds the other two amber lights come on even if I have not moved it (making me think its not a whel sensor). My brake light are woking so its not the switch, I have blead the brakes and all the wheel sensors seem good, and the hill desent switch is functioning correctly before the lights come on. Sometimes the lights stay off for a few minutes, but they always come on eventually and I don't know where to start finding out exactly what the problem is. Any help would be greatly appriciated.

Thanks to everyone who replied, (hope the sarcasm is not to overwhelming). Thought I would post the solution so the next person with the same issue can se what resolved it for me now I have sem to have solved the problem despite the lack of replies. The code was read and showed C1102, longitudial acceleration sensor signal. Replaced the "G sensor", (acceleroeter) and as if by magic fixed. The fact it would come on before the vehicle moved ind of verified it wasnt any of the wheel sensors, but there it is, fixed.

Thanks to everyone who replied, (hope the sarcasm is not to overwhelming)

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maybe those who knew about a "G sensor" didn't see yer post ..
'n folks who read it hadn't a solution in mind .. not be aware that a "G sensor" is fitted ..

but .. cheers for mentioning the solution ..
a quick site search for "G sensor" revealed all ..