Section 738 (Front Power Seat Control System (With Memory) - Diagnosis): Description

The power seat control system (w/memory) is equipped with following functions:

• Manual operation of the driver side seat.
• Individual seat positions for two different drivers can be stored for the slide-reclining front-vertical 8-way lifter.
• Similarly, power mirror and adjustable pedal positions for two different drivers can be stored.
• These are stored/restored with the seat positions.
• The above operations are performed using serial communication.
• As a safety precaution, the system disallows seat position restoration unless the ignition switch is ON, and the park/neutral position switch is in the P (parked) position.
• Manual adjustment of the slide reclining lumbar can be performed even when the ECU is not functional.

When the power seat control switch is operated, a command signal is sent to the position control ECU. The position control ECU then activates 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. The seat memory switch also sends signals to the position control ECU to memorize a given seat position. Two seat positions can be memorized. The seat memory switch is later used to send signal to the position control ECU to return to one of the memorized positions.