Lexus RX300 (MCU15). Manual — part 385
DI–770
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
9. Black screen appears when ”Present Location”, ”Menu” or ”Set
Designation” switch pressed.
INSPECTION PROCEDURE
1
Check the navigation ECU.
CHECK:
Check terminals +B.
OK:
+B: 10 – 14 V
CHECK:
Check terminal ACC when turn ignition switch ACC or ON position.
OK:
ACC: 10 – 14 V
CHECK:
Check terminal R, G, B, VR or VG.
OK:
R, G, B, VR or VG: See ”Navigation ECU” of ”TERMINAL OF ECU”
NG
Replace the wire harness when all terminals are
faulty. Replace the wire harness when SYNC ter-
minal is faulty.
OK
Replace the multi display.
DI7P2–02
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–771
LEXUS RX300 (RM785E)
10. Sound of radio, cassette tape or CD only cannot be heard
from speaker.
INSPECTION PROCEDURE
1
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.
DI7P3–02
DI–772
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
LEXUS RX300 (RM785E)
11. No sound (radio, cassette tape, CD) can be heard from driver
side door speaker only.
INSPECTION PROCEDURE
1
Service check mode.
NG
Troubleshoot for each diagnosis.
OK
2
Check wire harness (between navigation ECU and radio receiver assembly).
PREPARATION:
Disconnect the navigation ECU and radio receiver assembly connector.
CHECK:
(a)
Check continuity between terminal AUI+ of navigation ECU connector and terminal FL+ of radio receiv-
er assembly.
(b)
Check continuity between terminal AUI– of navigation ECU connector and terminal FL– of radio receiv-
er assembly.
OK:
Continuity
NG
Replace or repair wire harness.
OK
3
Check the navigation system voice.
OK
Go to step 6.
NG
DI7P4–02
–
DIAGNOSTICS
LEXUS NAVIGATION SYSTEM
DI–773
LEXUS RX300 (RM785E)
4
Check wire harness (between navigation ECU and driver side door speaker).
PREPARATION:
Disconnect the navigation ECU 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
5
Check the driver side door speaker.
NG
Replace the speaker.
OK
Replace the navigation ECU.
6
Check the navigation ECU.
CHECK:
Check terminal AUO+, AUO–, AUI+ and AUI–.
OK:
AUO+, AUO–, AUI+ and AUI–: See ”Navigation ECU” of ”TERMINAL OF ECU”.
NG
Replace the navigation ECU.
OK
Replace the radio receiver assembly.
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