Circuit Description
WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
This circuit sends an operation signal from the steering pad switch to the radio and navigation assembly. If there is an open in the circuit, the navigation system cannot be operated by the steering pad switch. If there is a short in the circuit, the resulting condition is the same as if the switch were continuously depressed. Therefore, the radio and navigation assembly cannot be operated by the steering pad switch, and the radio and navigation assembly itself cannot function.