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.

When the power seat control switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

When the position control ECU switch assy detects the low motor speed or abnormal activity, the system stops the motor. When the motor continuously operates for 120 seconds or more, the system will stop the motor until the switch is turned off.