Circuit Description
WARNING: This page is about a different car, the 2004 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.
The ECM memory contains the shift programs for the NORMAL, POWER and SNOW patterns, 2 position, L position and the lock-up patterns. By following the programs corresponding to the signals from the pattern select switch, the park/neutral position and other various sensors, the ECM switches the solenoid valves ON and OFF, and controls the transmission gear change and the lock-up clutch operation.