Toyota Sienna Service Manual: Driving Position Memory Switch Circuit (w/ Memory)

DESCRIPTION

The seat memory switch sends signals to the outer mirror control ECU LH via the multiplex communication system to memorize a given seat position. This memory system does not use a 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 seat memory switch is later used to send signals to the front power seat switch to return the seat to one of the memorized positions.

The power seat memory operation can be performed only when the ignition switch is on and the shift lever is in the P position.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester (with CAN VIM) to the DLC3.
2. Turn the ignition switch on.
3.  Read the DATA LIST.

D_SEAT (Position control ECU and switch assembly)

OK: Condition status can be displayed.

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2 INSPECT SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH)

1. Remove the seat memory switch.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

3 CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH CIRCUIT)

1. Measure the voltage according to the value(s) in the table below.

Standard voltage

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4 CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU LH - SEAT MEMORY SWITCH)

1. Disconnect outer mirror control ECU LH connector.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

REPLACE OUTER MIRROR CONTROL ECU LH