Engine Coolant Temperature Receiver Gauge Malfunction: 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.
In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN and BEAN lines The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.