Toyota Sienna Service Manual: Memory Switch Circuit

DESCRIPTION

When the seat memory switch M1 or M2 is pressed, the position control ECU & switch (Seat ECU) transmits a signal of the memorized mirror position to the outer mirror control ECU. Then, the outer mirror control ECU drives the mirror motor.

HINT: The power mirror control system is a part of the multiplex communication system. This system features shared communication wiring that reduces the wiring complexity of the communication lines. The first step in any repair is to confirm the proper operation of the communication system. Proceed with troubleshooting after the communication has been verified (See the Multiplex Communication System).

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.
2.  Ignition switch on.
3.  Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST.
4.  Check the DATA LIST for proper function of the seat memory switch.

D-SEAT

OK: Tester displayed MEM.

2 INSPECT SEAT MEMORY SWITCH

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

Standard resistance

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

1. Disconnect the S33 switch connector.
2.  Disconnect the O9 ECU connector.
3.  Measure the resistance according to the value(s) in the table below.

Resistance

REPLACE OUTER MIRROR CONTROL ECU