How do you turn off maintenance required light on a 1999 Chevrolet Express Van?

To turn off the maintenance required light on a 1999 Chevrolet Express Van, first, ensure that any necessary maintenance has been performed. Then, turn the ignition key to the "ON" position without starting the engine. Press the gas pedal three times within five seconds. This should reset the maintenance light. If the light remains on, consult the owner's manual or a professional mechanic for further assistance.