Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018IB001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: WIPER AND WASHER: WIPER AND WASHER SYSTEM: Wiper and Washer Switch Circuit; 2007 MY LX470 [08/2006 -        ]

Wiper and Washer Switch Circuit

DESCRIPTION

Front wiper switch circuit:

This circuit detects the state of the front wiper switch and sends it to the auto wiper ECU (wiper control ECU).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK WIRE HARNESS (COMBINATION SWITCH - AUTO WIPER ECU (WIPER CONTROL ECU)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

2.

CHECK WIRE HARNESS (COMBINATION SWITCH - BODY GROUND))
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

DESCRIPTION

Front washer switch circuit:

This circuit detects the state of the front washer switch ON or OFF signal to the auto wiper ECU (wiper control ECU).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

INSPECT FUSE (WASHER)

(a) Remove the WASHER fuse from the cowl side junction block RH.

(b) Measure the continuity of the fuse.

OK:

Continuity

NG

REPLACE FUSE

OK

2.

CHECK WIRE HARNESS (COMBINATION SWITCH - AUTO WIPER ECU (WIPER CONTROL ECU))
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

DESCRIPTION

Rear wiper switch circuit:

This circuit detects the state of the rear wiper and washer switch and sends it to the sub body ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

INSPECT FUSE (WASHER)

(a) Remove the WASHER fuse from the cowl side junction block RH.

(b) Measure the continuity of the fuse.

OK:

Continuity

NG

REPLACE FUSE

OK

2.

INSPECT COMBINATION SWITCH ASSEMBLY (REAR WIPER AND WASHER SWITCH)

(a) Inspect the rear wiper and washer switch assembly 2007 MY LX470 [08/2006 -        ]; WIPER AND WASHER: WIPER SWITCH: INSPECTION .

NG

REPLACE COMBINATION SWITCH ASSEMBLY

OK

3.

CHECK WIRE HARNESS (COMBINATION SWITCH - SUB BODY ECU)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE