Unlock Position Sensor Signal Circuit: Description
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
The steering lock ECU sends an unlock position signal to the main body ECU. On receiving the signal, the main body ECU permits the hybrid control system start. This prevents the hybrid control system from being started with the steering locked.
The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.