Circuit Description Detecting Conditions
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.
The hydro motor relay supplies power to the hydraulic brake booster pump motor. While the ABS & EBD RSB are activated, the ECU switches the motor relay ON and operates the hydraulic brake booster pump motor. To identify DTC detecting conditions, see Fig 1.