Lexus RX300 (MCU15). Service manual — part 389

DI–786

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

19. No voice navigation.

INSPECTION PROCEDURE

1

Set the volume to the max in the menu screen.

OK

Normal. (Voice navigation is not available. No
destination is set, or the vehicle is running off
the route.)

NG

2

Check wire harness (navigation ECU and driver side door speaker).

PREPARATION:
Disconnect the navigation ECU connector and driver side door speaker connector.
CHECK:
(a)

Check continuity between terminal AUO+ of navigation ECU connector and terminal 1 of driver side
door speaker.

(b)

Check continuity between terminal AUO– of navigation ECU connector and terminal 2 of driver side
door speaker.

OK:
Continuity

NG

Replace or repair wire harness.

OK

3

Check the sound. (Check if the radio sound can be heard from the driver side
door speaker.)

OK

Replace the navigation ECU.

NG

Replace the speaker.

DI7PC–02

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–787

LEXUS RX300 (RM785E)

20. Vehicle position rotates without control. (Map rotates without
control)

INSPECTION PROCEDURE

1

Recheck. (While not rotating the vehicle, turn the ignition switch ON from OFF
again.)

OK

Normal. (While the vehicle was turning, the igni-
tion switch was turned ON.)

NG

2

System check mode. (Is ”58–10” is displayed in the unit check mode of the navi-
gation ECU?)

Yes

Replace the navigation ECU.

No

3

System check mode. (Is ”58–43” is displayed in the unit check mode of the navi-
gation ECU?)

Yes

Replace and repair SPD terminal wire harness.

No

4

Navigation check mode (vehicle signal check mode: SPD and gyro).

OK

Replace the navigation ECU.

NG

DI7PD–02

DI–788

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

Replace or repair wire harness.

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–789

LEXUS RX300 (RM785E)

21. Driving direction is opposite to moving direction of vehicle
position mark.

INSPECTION PROCEDURE

1

Navigation check mode (vehicle signal check mode REV).

OK

Replace the navigation ECU.

NG

2

Check the navigation ECU.

CHECK:
Check terminal REV.
OK:

REV: See ”Navigation ECU” of ”TERMINAL OF ECU”.

OK

Replace the navigation ECU.

NG

Replace or repair wire harness.

DI7PE–02