Circuit Description
WARNING: This page is about a different car, the 2003 Toyota Prius, 2002 Toyota Prius, and 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
There is a case that the TOYOTA hand-held tester cannot be used when the ECU is abnormal.
If ABS ECU detects a system malfunction, ABS ECU illuminates ABS warning light while at the same time prohibiting ABS control. There may be a malfunction in ECU internal circuit, or If ECU connectors are disconnected from ECU.