Lexus RX300 (MCU15). Service manual — part 383

DI–762

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

4. No corresponding screen displayed when ”Audio” or ”Informa-
tion” switch pressed.

INSPECTION PROCEDURE

1

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

NG

Replace or repair AVC–LAN circuit.

OK

2

”Audio” and ”Information” switch does not function.

NG

Replace the center cluster mudule control.

OK

3

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

NG

Replace the center cluster mudule control.

OK

Replace the multi display.

DI7OX–03

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–763

LEXUS RX300 (RM785E)

5. No navigation displayed, ”Audio OFF” on audio screen and no
audio sound.

INSPECTION PROCEDURE

1

Service check mode.

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.

OK

3

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

NG

Replace the AVC–LAN circuit or radio receiver
assembly.

OK

DI7OY–03

DI–764

–

DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

LEXUS RX300 (RM785E)

Replace the multi display.

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DIAGNOSTICS

LEXUS NAVIGATION SYSTEM

DI–765

LEXUS RX300 (RM785E)

6. Screen cannot be dimmed in night time.

INSPECTION PROCEDURE

1

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

Check the light control switch.

OK

2

Check the multi display.

CHECK:
Check terminal TAIL.
OK:

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

NG

Replace or repair wire harness.

OK

3

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.

DI7OZ–02