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>>I used to have to reset the tire pressure warning light on my 2000 Sienna[color=blue][color=green]
>>every time I took it to a dealer for service (oil change & tire rotation).
>>
>> Ever since I stopped taking it to dealer for service, I no longer getting
>> the warning lights after tire rotation.
>>
>> So did I do anything wrong during tire rotation that damaged the tire
>> pressure sensors? I sometimes clean the brakes using brake cleaner when
>> rotating tires. Could the brake cleaner damage the sensors?
>>
>> Should some warning lights go off if the sensors are damaged?
>>
>> I do want the warning light working properly.
>>
>> Thanks for any info![/color]
>
> I believe that the 2000 Sienna uses an indirect method of detecting low
> tire pressure. Instead of having an air pressure sensor mounted on the
> valve stem, an indirect method detects low tire pressure by detecting a
> difference in wheel rotational speed through the antilock brake system
> (ABS) wheel speed sensors. An under-inflated tire will rotate more slowly
> than the rest of the tires, and if the computer detects this condition, it
> will illuminate the warning light.
>
> I don't know why rotating tires would turn on the warning light, and
> rotating tires yourself or cleaning the brakes should not damage the wheel
> speed sensors. The ABS system does a self-diagnostic check when the
> vehicle is first started and move the first 10 feet. If a wheel speed
> sensor were damaged, the ABS warning light would illuminate.
> --
>
> Ray O
> (correct punctuation to reply)[/color]

Great! That's a relieve. I do seem to remember one or more tire would be
flatter after the dealer rotated the tires and I had to inflate them. May be
they deflated or inflated some of the tires but forgot to do the same on all
tires.

Thanks!