Guys,
I've been noticing of late on intermittent occasions my ABS light comes on and goes off when the engine is started.
When the ignition switch is turned on all the dash warning lights including the ABS light come on and go out. But when the engine is started the ABS light comes in momentarily and goes out.

What could be the reason??
The car has run 97300kms and will be 7 years old this August. It is still running on the original factory fitted battery.

Your inputs would be greatly appreciated thanks.