Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM00000190T001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): Power Seat Motor Circuit; 2007 MY LX470 [08/2006 -        ]

Power Seat Motor Circuit

DESCRIPTION

The power seat control ECU controls the following 4 motors : slide, front vertical, lifter and reclining.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK POWER SEAT MOTOR

(a) Remove the seat.

(b) Check operation of the slide motor.

(1) Check if the seat moves smoothly when the battery is connected to the slide motor connector terminals.

OK:

Measurement Condition

Operation Direction

Battery positive (+) → 2

Battery negative (-) → 1

Forward

Battery positive (+) → 1

Battery negative (-) → 2

Rearward

(c) Check operation of the front vertical motor.

(1) Check if the seat moves smoothly when the battery is connected to the front vertical motor connector terminals.

OK:

Measurement Condition

Operation Direction

Battery positive (+) → 1

Battery negative (-) → 2

Upward

Battery positive (+) → 2

Battery negative (-) → 1

Downward

(d) Check operation of the lifter motor.

(1) Check if the seat moves smoothly when the battery is connected to the lifter motor connector terminals.

OK:

Measurement Condition

Operation Direction

Battery positive (+) → 1

Battery negative (-) → 2

Upward

Battery positive (+) → 2

Battery negative (-) → 1

Downward

(e) Check operation of the reclining motor.

(1) Check if the seat moves smoothly when the battery is connected to the reclining motor connector terminals.

OK:

Measurement Condition

Operation Direction

Battery positive (+) → 2

Battery negative (-) → 1

Forward

Battery positive (+) → 1

Battery negative (-) → 2

Rearward
NG

REPLACE POWER SEAT MOTOR

OK

2.

CHECK WIRE HARNESS (POWER SEAT CONTROL ECU - POWER SEAT MOTOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE