Circuit Description

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

The VSC MTR relays consist of 2 relays and are included in the ABS R/B.
The VSC MTR relay is turned on after turning the ignition switch to the ON position. If the DTCs in the ABS pump motor circuit are memorized, the ABS motor relay 1 cuts off the power supply to the VSC cut relay and performs the fail safe.
While any of the ABS, BA, TRAC and VSC is operating, the skid control ECU (included in the actuator) turns the VSC cut relay on to operate the actuator pump motor.
If the voltage applied to the ABS motor relays (+BM) drops below the condition that detects the DTCs due to the shortage of the battery or alternator output, the DTCs may be memorized.

Fig 1: Open Circuit In ABS Motor Relay Circuit Description