Tire Pressure Warning Light Circuit: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
If the tire pressure warning ECU and receiver detects a malfunction, the tire pressure warning light comes on and tire pressure warning system is cancelled at the same time At this time, the tire pressure warning ECU and receiver records a DTC in the memory