Lexus RX300 (MCU15). Service manual - part 387

DI–778

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300   (RM785E)

15. Navigation screen cannot change to the night mode color.

INSPECTION PROCEDURE

1

Check the setting. (Is it set to Day Mode in screen adjustment?)

Yes

Normal.

No

2

Check if the screen is dimmed at night. (With the light control switch ON, do all
screens except the navigation screen appear in Night Mode?)

NG

Go to step 5.

OK

3

Does the beep sound by operating switches on the navigation screen?

OK

Replace the navigation ECU.

NG

4

Check ”AVC–LAN communication circuit” (See page DI–798).

NG

Replace or repair AVC–LAN circuit.

OK

Replace the navigation ECU.

DI7P8–03

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–779

LEXUS RX300   (RM785E)

5

Check the multi display.

CHECK:
Check terminal TAIL.
OK:

TAIL: See ”Multi Display” of ”TERMINAL OF ECU”.

OK

Replace the multi display.

NG

Replace or repair wire harness.

DI–780

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300   (RM785E)

16. Touch switch does not function. (Navigation screen only)

INSPECTION PROCEDURE

1

Display check mode (Touch switch, Touch point screen).

NG

Replace the multi display.

OK

2

Check ”AVC–LAN communication circuit” (See page DI–798).

NG

Replace or repair AVC–LAN circuit.

OK

Replace the navigation ECU.

DI7P9–03

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–781

LEXUS RX300   (RM785E)

17. Vehicle position is deviated from correct point badly.

INSPECTION PROCEDURE

1

Check the mark display. (At a place with a fine view, is GPS mark displayed or
not?)

No

Go to step 7.

Yes

2

Does the trouble occur in the specific area or not?

Yes

Normal. (If the vehicle is positioned in the place
where it is difficult to be identified, the current
vehicle position may be incorrectly displayed.)

No

3

Check the setting (Color of the automatic calibration button on the calibration
screen).

Green 

Normal. (Drive the vehicle (10 km or more) until
calibration is completed.

Blue

4

Service check mode. (

Is ”58–43” displayed in the unit check mode of the navigation

ECU?)

Yes

Troubleshoot for each diagnosis.

No

DI7PA–03