The automatic transmission fluid temperature warning light illuminates for 3 seconds when the ignition switch is turned ON, and then turns OFF if the ATF temperature is 150°C {302°F} or less. If the ignition switch is turned ON, the TCM illuminates the automatic transmission fluid temperature warning light for 3 seconds for a bulb check. The TCM performs light control by sending light drive requests to the instrument panel cluster via the CAN communication circuit.
The automatic transmission fluid temperature warning light illuminates to notify the driver that the ATF temperature has become high .