Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018CG001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): Position Sensor Circuit; 2007 MY LX470 [08/2006 -        ]

Position Sensor Circuit

DESCRIPTION

  • The position sensor detects movement of the seat and sends pulse signals to the power seat control ECU. The position sensor sends the pulse signals to the ECU in proportion to the amount of seat movement.
  • The ECU uses the pulse signals to constantly calculate the position relative to the memory position and returns the seat to the memorized position.
  • If a malfunction occurs in a position sensor and a sensor signal is not input to the ECU even when the motor operates, the ECU prohibits return operation.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK POWER SEAT POSITION SENSOR

(a) Without disconnecting the power seat position sensor's connector, measure the voltage between terminal O/P of the sensor and body ground.

Standard voltage:

Tester Connection

Condition

Specified Condition

A2-4 (O/P) - Body ground

Motor stopped (Check several times with the motor in a different position each time)

0 V or 8 V according to stop position

A2-4 (O/P) - Body ground

With motor turning

Alternating between 8 V and below 1 V

B2-4 (O/P) - Body ground

Motor stopped (Check several times with the motor in a different position each time)

0 V or 8 V according to stop position

B2-4 (O/P) - Body ground

With motor turning

Alternating between 8 V and below 1 V
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

NG

2.

CHECK WIRE HARNESS (POWER SEAT CONTROL ECU - POSITION SENSOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE