Toyota Sienna Service Manual: Park / Neutral Position Switch Circuit

DESCRIPTION

The fold seat control ECU receives signals from the Park/Neutral position switch and controls the seat stowing and return operations. If the shift lever is in any position other than P the seat cannot be operated.

If the ignition switch is in ACC or IG the seat cannot be operated.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 INSPECT FOLD SEAT CONTROL ECU

1. Remove the fold seat control ECU with connectors still connected.
2.  Turn the ignition switch ON.
3. Measure the voltage according to the value(s) in the table below.

Standard voltage: LH side

RH side

2 CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH)

1. Disconnect the connector from the park/neutral position switch.
2.  Disconnect the connectors from the fold seat control ECU.
3.  Measure the resistance according to the value(s) in the table below.

Standard resistance: LH side

RH side

3 INSPECT PARK/NEUTRAL POSITION SWITCH

1. Remove the park/neutral position switch.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

4 CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - BATTERY)

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

Standard voltage

REPLACE FOLD SEAT CONTROL ECU