Front Power Seat Control System (W/Memory) - Diagnostics: Description

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

• Manual operation of the front 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 by pushing the seat memory switch (driver side seat only).
• 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 shift position is in the P position.
• Manual adjustment of the lumbar support function can be performed even when the memory seat ECU and SW is not functional.

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