If it stays lit your X is not going into "sleep mode". Look into X to see if it has gone out after 30 mins, do not use the key remote or open a door, this ends "sleep mode" and turns the light on.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!