1. turn the key to on position.
2. using the small peg on the gauge cluster, set odometer screen to "ODO"
3. turn key off
4. hold peg down and without releasing, turn key to on position once again.
5. on the odometer screen, watch the dashes tick down and then wait until the screen flashes zeros.
after zeros flash, maintenance required light is reset.
This light has to be reset manually each time, so dont expect it to reset on its own.
P.S. no 3rd Gen 4runners have "MAINT REQ'D" lights... so you may want to post in the 4th or 5th gen threads for future problems... youll probably get a better response