According to the repair manual:
Remove the grommet from the speedometer and turn off the lamp by pushing the warning light reset switch, then replace the grommet.
I believe that is a dealer only problem.
the warning lights comes on indicating that the timing belt needs to be changed. even once the timing belt is changed, the warning light will stay on until is it reset.
If the light on its time to renew the timing belt (t-belt)
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The timing belt warning light, on a Toyota Innova, can be reset by removing the timing belt warning light fuse. Leaves the fuse out for 10 seconds and put it back in.
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