Seats: Description and Operation

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): SYSTEM DIAGRAM





1. SIGNAL COMMUNICATION TABLE











SYSTEM DESCRIPTION

1. GENERAL DESCRIPTION

The power seat control system (w/ memory) controls the 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 positions for two different drivers can be stored. These are stored/restored together with the seat positions by pushing the seat memory switch (driver side seat only).

* The above operations are performed using the multiplex communication system.

* As a safety precaution, the system disallows seat position restoration unless the ignition switch is on (IG) and the shift lever position is in P.

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

2. MEMORY CALL FUNCTION

(a) This function uses the key ID to move the seat automatically into the position previously set for the key ID when the driver side door is opened or the ignition switch is turned on (ACC or IG) after the doors are unlocked.

3. FUNCTION OF MAIN COMPONENT

The following functions are available.





4. SYSTEM OPERATION

The front power seat adjustment and position memory are shown in the chart below.





In the memory function, the memory switch operation is initially transferred from the outer mirror control ECU assembly to the position control ECU & switch assembly (front power seat switch) via the multiplex communication line. Then, either the seat position is stored in memory or a previously stored seat position is recalled to seat the appropriate seat position.