Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001ABQ001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: Entire Image is White; 2007 MY LX470 [08/2006 -        ]

Entire Image is White

DESCRIPTION

A white screen occurs by a malfunction of the night view camera or the night view display, and also by dirt on the windshield.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK WINDSHIELD GLASS IN FRONT OF NIGHT VIEW CAMERA

(a) Check the windshield glass in front of the night view camera.

OK:

Windshield glass is clean.

HINT:

Night view camera cleaning method 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: ON-VEHICLE CLEANING+ .

NG

CLEAN WINDSHIELD GLASS (DIRT ON WINDSHIELD GLASS)

OK

2.

CHECK NIGHT VIEW CAMERA

(a) Remove the over head junction (map light cover).

(b) Disconnect the connector from the night view camera.

(c) Connect SST to the wire harness of the night view camera on the body side as shown in the illustration.

SST: 09991-00610

(d) Turn the ignition switch ON.

(e) Switch to inspection mode 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: OPERATION CHECK .

(f) Check the screen of the night view display.

OK:

3 levels of black-white shade intensity displayed.

OK

REPLACE NIGHT VIEW CAMERA

NG

3.

CHECK NIGHT VIEW ECU (VGL VOLTAGE)

(a) Remove the combination meter assembly.

(b) Turn the ignition switch ON.

(c) Measure the voltage between terminal VGL of the night view ECU connector "C" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

-15 to -17 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.
NG

GO TO STEP 7

OK

4.

CHECK NIGHT VIEW ECU (VDD VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminal VDD of the night view ECU connector "C" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

4.75 to 5.25 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.
NG

GO TO STEP 7

OK

5.

CHECK NIGHT VIEW ECU (VGH VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminal VGH of the night view ECU connector "C" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

17.4 to 18.6 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.

Result

Result

Proceed to

OK

<Reference>

A

(when using oscilloscope)

B*

(when not using oscilloscope)

NG

C

HINT:

*: If the symptom still occur after replacing night view, replace the night view display.
B

REPLACE NIGHT VIEW ECU

C

GO TO STEP 7

A

6.

CHECK NIGHT VIEW ECU (VG VOLTAGE)

(a) Turn the ignition switch ON.

(b) Switch to inspection mode 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: OPERATION CHECK .

(c) Using an oscilloscope, check the output waveform between terminal VG of the night view ECU connector "C" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

OK:

The output waveform is as shown in the illustration.

(Reference) oscilloscope condition

Item

Contents

Tool setting

200 mV/DIV., 10 μsec./DIV.

Vehicle condition

When night view system starts up
NG

REPLACE NIGHT VIEW DISPLAY

OK

REPLACE NIGHT VIEW ECU

7.

CHECK NIGHT VIEW ECU (VGL VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminal VGL of the night view ECU connector "B" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

-15 to -17 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.
NG

GO TO STEP 10

OK

8.

CHECK NIGHT VIEW ECU (VDD VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminal VDD of the night view ECU connector "B" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

4.75 to 5.25 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.
NG

GO TO STEP 10

OK

9.

CHECK NIGHT VIEW ECU (VGH VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between terminal VGH of the night view ECU connector "B" and body ground.

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard voltage:

17.4 to 18.6 V

HINT:

Terminal voltage must meet the specified value within 20 seconds after ignition switch is ON.
OK

REPLACE NIGHT VIEW ECU

NG

10.

CHECK WIRE HARNESS (NIGHT VIEW BATTERY ECU - NIGHT VIEW ECU)

(a) Remove the wire harness between the night view battery ECU and the night view ECU.

(b) Measure the resistance between terminals VGL, VDD, and VGH of connector "D" and those of "B".

(Terminals of ECU: 2007 MY LX470 [08/2006 -        ]; PARK ASSIST / MONITORING: NIGHT VIEW SYSTEM: TERMINALS OF ECU )

Standard resistance:

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE NIGHT VIEW BATTERY ECU