At Oil Temp Warning Light Display: Inspection

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

At normal condition
Always light OFF
When ATF temperature is high
AT OIL TEMP light illuminates when the ATF temperature is abnormally high with the ignition switch ON.
When malfunction is detected
AT OIL TEMP light blinks at 2 Hz when the TCM detects the malfunction of CVT with the ignition switch ON. In this case, inspect using "Diagnostic Procedure with Diagnostic Trouble Code (DTC)". Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
When AT learning is not finished
AT OIL TEMP light repeats "Blinking at 4 Hz → Turning OFF" when the AT learning is not completed with the ignition switch ON. In this case, perform the "Learning". Ref. to TRANSMISSION (DIAGNOSTICS)>LEARNING CONTROL

Courtesy of SUBARU OF AMERICA, INC.

If the illumination patterns are not as above, check the AT OIL TEMP light circuit.