Lexus RX300 (MCU15). Service manual — part 386

DI–774

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

12. Map DISC cannot be inserted.

INSPECTION PROCEDURE

1

Check the MAP DISC.

NG

Replace the MAP DISC.

OK

2

Insert a MAP DISC without tilt.

OK

Normal.

NG

3

Check the navigation ECU.

PREPARATION:
Disconnect the navigation ECU connector.
CHECK:
Check voltage terminals +B.
OK:

+B: 10 – 14 V

CHECK:
Check voltage terminal ACC when turn ignition switch ACC or ON position.
OK:

ACC: 10 – 14 V

CHECK:
Check continuity terminal GND.
OK:

GND: Continuity

NG

Replace or repair wire harness.

OK

DI7P5–02

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–775

LEXUS RX300 (RM785E)

Replace the navigation ECU.

DI–776

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

13. MAP screen display does not appear. (Disc Caution screen
does not change)

INSPECTION PROCEDURE

1

Take appropriate measures according to the caution screen.

OK

Normal.

NG

2

Check map DISC.

NG

Replace the disc.

OK

Replace the navigation ECU.

CAUTION SCREEN

CAUTION MESSAGE

CAUSE

CORRECTIVE ACTION

Cover is open.

Close it.

The cover of the map disk slot is open.

Close the cover,

No disc is set.

Set a map disc.

No map disk is inserted.

Insert a proper map disc.

Data cannot be read properly.

Check it for scratches or dirt.

Data cannot be read because the map disc is

dirty or scratched.

Wipe off dirt on the both disc surface with soft

cloth.

Data cannot be read.

Check the correct map disc is set.

Something other than map disc is inserted.

Insert a correct map disc.

Due to high temperature of the player,

data cannot be read.

Pick–up part of the player is heated to a high

temperature.

Stop the vehicle at a shaded cool place and turn

the ignition switch OFF.

When confirming that the temperature of the navi-

gation ECU has been lowered, turn the ignition

switch ON.

Data cannot be read.

Contact your sales dealer.

The player cannot read data from the map disc

temporarily.

Turn the ignition switch OFF and ON.*1

*1: If the same caution screen appears again after turning the ignition switch ON, replace the navigation
ECU.

DI7P6–02

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–777

LEXUS RX300 (RM785E)

14. Map is displayed in white or blue screen. (Switches and ve-
hicle position mark is displayed)

INSPECTION PROCEDURE

1

Set the map scale to the max.

OK

Normal.

HINT:
Correct the current position and check it again.

NG

2

Wipe the disc with a soft cloth, insert it again, and turn the ignition switch ON
from OFF.

NG

Replace the disc.

OK

Normal.

HINT:
If the trouble still occurs, replace the navigation ECU.

DI7P7–02