Lexus RX300 (MCU15). Manual - part 382

DI–758

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300   (RM785E)

2. No sound with POWER switch pressed. (”Audio OFF” on audio
screen)

INSPECTION PROCEDURE

1

Service check mode. (Check radio receiver assembly)

NG

Troubleshoot for each diagnosis.

OK

2

Check the radio receiver assembly.

PREPARATION:
Disconnect the radio receiver assembly 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 or connector.

OK

Replace the radio receiver assembly.

DI7OV–02

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–759

LEXUS RX300   (RM785E)

3. No navigation screen displayed when ”MAP”, ”Menu”, or ”DEST”
switch pressed. (Screen cannot be switched.)

INSPECTION PROCEDURE

1

Service check mode. (Check the navigation ECU)

NG

Troubleshoot for each diagnosis.

OK

Go to step 6.

Ncon

2

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 or connector.

OK

DI7OW–02

DI–760

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300   (RM785E)

3

Check the navigation ECU.

CHECK:
Check terminal R, G and B.
OK:

R, G, B: See ”Naavigation ECU” of ”TERMINAL OF ECU”.

NG

Replace the navigation ECU.

OK

4

Check the multi display.

PREPARATION:
Disconnect the multi display 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 or connector.

OK

5

Check the multi display.

CHECK:
Check terminal R, G and B.
OK:

R, G, B: See ”multi display” of ”TERMINAL OF ECU”.

NG

Replace the multi display.

OK

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–761

LEXUS RX300   (RM785E)

Replace the multi display.

6

All of the switches (MAP, Menu, DEST etc.) does not function.

No

Replace the center cluster module control.

Yes

7

Check each switch (A/C switch e.t.c.) of the center cluster module control does
not function.

No

Replace the center cluster module control.

Yes

Replace the multi display.