Upshift Indicator
On vehicles equipped with a manual transmission, the ECU controls the upshift indicator light. The indicator light is normally illuminated when the ignition switch is turned on without the engine running. The light is turned off when the engine is started.
The indicator light will be illuminated during engine operation in response to engine load and speed. If the gears are not shifted, the ECU will turn the light off after 3 to 5 seconds. A switch located on the transmission prevents the light from being illuminated when the transmission is shifted to the highest gear.