Signal Path

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

When TCM detects malfunction (DTC) of transmission, TCM transmits the AT CHECK indicator lamp signal to the combination meter via CAN communication.
The combination meter turns ON the AT CHECK indicator lamp on the combination meter, according to the signal.