Lexus RX300 (MCU15). Manual — part 153
DTC
Diagnosis item
Diagnosis content
Countermeasure
and inspected parts
System
Check
Diagnosis
memory
X
f
f
f
X
AMP
(440)
D1
D4
FF
Diagnosis no response
Result of diagnosis is not
issued from start to finish.
Stereo component
amplifier check.
f
Parts
Name
Transmitter error
68
69
D1
D4
FF
Elevator error
Clamp error
Periodic communication
error
Diagnosis no response
An error occurs in
elevator of CD changer
elevator.
An error occurs in CD
changer clamp.
Result of diagnosis is not
issued from start to finish.
X
X
f
X
f
f
f
f
f
X
Transmitter error
CD
(240)
(360)
Center
Cluster
(1c4)
f
D1
f
Transmitter error
X
f
D4
Periodic
communication
error
Center Cluster Check
Multi
Display
(1d4)
f
D1
f
Transmitter error
Multi–Display Check
X
f
D4
21
22
ROM error
RAM error
There is an error on
internal ROM.
There is an error on
internal RAM.
f
X
f
X
Periodic
communication
error
Periodic
communication
error
CD changer check.
D Radio receiver check.
D Wire harness check.
D Radio receiver check.
D Wire harness check.
Stereo component
amplifier check.
D Radio receiver check.
D Wire harness check.
D Radio receiver check.
D Wire harness check.
Multi–Display Check
CD changer check.
Communication with the
equipment that is
communicating has failed
successively.
Communication with the
equipment that is
communicating has failed
successively.
Communication with the
equipment that is
communicating has failed
successively.
Communication with the
equipment that is
communicating has failed
successively.
Connection confirmation
has not come from the
equipment that is
communicating
Connection confirmation
has not come from the
equipment that is
communicating
Connection confirmation
has not come from the
equipment that is
communicating
Connection confirmation
has not come from the
equipment that is
communicating
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
BE–159
LEXUS RX300 (RM785E)
( ): w/ Navigation system
1
Radio
RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO ”ON”
+ B wire harness faulty.
GND faulty.
Power amplifier or ACC wire harness faulty.
Power amplifier or +B wire harness faulty.
GND faulty.
Is tape player operating normally?
Check if RAD–No.2 fuse is OK?
Is power supplied to ACC terminal of power amplifier?
Yes
NG
No
OK
No
No
No
No
OK
OK
OK
Yes
Yes
Yes
Yes
NG
NG
NG
Check if RAD–No.1 fuse is OK?
Radio assembly faulty.
Replace fuse.
ACC wire harness faulty.
Check if GND (wire harness side) to radio assembly is OK?
Radio assembly faulty.
Replace fuse.
Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?
Is power supplied to +B terminal of radio assembly?
Check if GND (wire harness side) of power amplifier
grounded normally?
BE–160
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
LEXUS RX300 (RM785E)
2
Radio
DISPLAY INDICATES WHEN POWER SWITCH TURNED TO
”ON”, BUT NO SOUND (INCLUDING ”NOISE”) IS PRODUCED
+ B wire harness faulty.
GND faulty.
Power amplifier faulty.
Speaker wire harness faulty.
GND faulty.
Is tape player operating normally?
Check if RAD–No.2 fuse is OK?
Yes
NG
No
OK
No
No
No
No
OK
OK
OK
Yes
Yes
Yes
Yes
NG
NG
NG
Check if RAD–No.1 fuse is OK?
Radio assembly faulty. Recheck system after repair.
Replace fuse.
ACC wire harness faulty.
Radio assembly faulty.
Replace fuse.
Does continuity exist in speaker wire harness?
Temporarily install another speaker. Functions OK?
Hiss noise from speaker?
Yes
Yes
No
No
No
Yes
Power amplifier faulty.
Power amplifier faulty.
Recheck system after repair.
Speaker faulty.
Is power supplied to ACC terminal of power amplifier?
Check if GND (wire harness side) of power amplifier
grounded normally?
Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio receiver?
Is power supplied to +B terminal of radio receiver?
Check if GND (wire harness side) of power amplifier
grounded normally?
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
BE–161
LEXUS RX300 (RM785E)
Speaker wire harness faulty.
Is tape player operating normally?
Yes
No
Radio assembly faulty.
Recheck system after repair.
Radio assembly faulty.
Temporarily install another speaker? Functions OK?
Power amplifier faulty. Recheck system after repair.
Speaker faulty.
4
Radio
ANY SPEAKER DOSE NOT WORK
Is hiss noise produced by non–functioning speaker?
Does continuity exist in speaker wire harness?
Yes
Yes
No
Yes
No
No
3
Radio
NOISE PRESENT, BUT AM–FM NOT OPERATING
Go to No.25
Radio faulty.
If radio side faulty.
BE–162
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
LEXUS RX300 (RM785E)
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