•  The automatic transmission warning light illuminates when the transmission has malfunction.

•  The automatic transmission warning light is built into the instrument cluster.

•  If the transmission has a malfunction, the TCM sends an automatic transmission warning light illumination request signal to the instrument cluster.

•  The TCM illuminates the automatic transmission warning light for approx. 2 s after the ignition is switched ON to perform a bulb check of the automatic transmission warning light.