Lexus RX300 (MCU15). Service manual — part 152
I10177
8
1
Function Switch
DISC Switch
7
2
6
5
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
BE–155
LEXUS RX300 (RM785E)
1.
DIAGNOSIS FUNCTION
Error codes over tuner and connected equipment are displayed on the screen of tuner.
HINT:
Press the function switch instead of TRACK TUNE APS switch.
(a)
Diagnosis start–up
For shifting to diagnosis mode, push ”DISC” switch 3 times with pressing ”1” and ”6”,”7” or ”8” of function
switch at the same time while the audio power is OFF and ACC is ON.
To exit from diagnosis mode, press ”DISC” switch for 2 seconds or turn the ignition key OFF.
(When ”1–190” is displayed, the mode is transferred to LAN check mode.)
(b)
LAN check
When starting up the diagnosis mode, the mode turns to LAN check mode, the screen displays the
code numbers (physical address) of tuner and connected equipment. Smaller codes are displayed in
order, displayed code numbers are switched by operating TUNE ”UP” or ”DOWN” switch. In LAN check
mode, by pressing ”5” of function switch for more than 2 secs., diagnosis memory of each equipment
can be deleted, when deletion is completed, the mode returns to LAN check mode.
Code No. (physical address) List
Code No. (physical address)
Equipment name
190
Radio receiver assembly (Audio head unit)
1c4
Center Cluster Integration Switch
1d4
Multi Display
240
CD changer (in Luggage room)
360
CD changer(in center console and glove compartment box)
440
Power amplifier
H: This shows the equipment has a diagnosis code.
190: Physical address
1: This is the number allotted to the diagnosis code
that occurred.
21: DTC No.
Last Code No.
: NO DTC No.
Pressing TURN ”DOWN”
Pressing TURN ”UP”
..
.
..
.
1: This is the number allotted to the diagnosis code
that occurred.
BE–156
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
LEXUS RX300 (RM785E)
(c)
System check
When pressing ”1” of function switch in LAN check mode, the mode turns to the system check mode,
the system performs self diagnosis of connected equipment and displays the results.(”SYS” (showing
the system is under detection) is displayed.)
Perform the operation shown in the following illustration, then read the result of the inspection.
HINT:
S
It sometimes takes approx. 40 secs. till the system inspection is completed.
S
The chart below is an example of when diagnosis code ”21” appears on the physical address (190)
equipment. (ROM error occurs on the radio receiver.)
S
The smaller code numbers (physical address) are displayed in order (code No., diagnosis code, sup-
port code of diagnosis code (object equipment)).
S
When no error is detected in the system, ”00” is displayed.
S
When an error code is detected, up to 6 codes per one system are displayed. Pressing TUNE ”UP”
or ”DOWN” switches the display.
S
In the system check mode, when pressing ”8” of function switch the mode returns to LAN check mode.
(d)
Diagnosis memory
(1)
In LAN check mode, when pressing ”2” of TRACK TUNE APS switch the mode turns to the diag-
nosis memory mode. (”CODE” is displayed.)
The results of self diagnosis performed over tuner and connected equipment are memorized and
displayed.
(2)
Perform the operation shown in the following illustration, then read the result of the inspection.
HINT:
S
The smaller code numbers (physical address) are displayed in order (code No. , periodic communica-
tion number when error occurs, diagnosis code, and support code of diagnosis code (object equip-
ment)).
S
When no error is detected in the system, ”00” is displayed. When an error code is detected, up to 6
codes per one system are displayed. Pressing TUNE ”UP” or ”DOWN” switches the display. Each diag-
nosis code is same as code in the system check mode.
S
When pressing ”8” of function switch, the mode returns to LAN check mode.
H: This shows the equipment has a diagnosis code.
190: Physical address
1: This is the number allotted to the diagnosis code
that occurred.
Last Code No.
..
.
..
.
06: Periodic communication number of when
occurring in the diagnosis memory code.
Pressing TURN ”DOWN”
Pressing TURN ”UP”
21: Periodic communication number of when
occurring in the diagnosis memory code.
1: This is the number allotted to the diagnosis code
that occurred.
d1: DTC No.
1: This is the number allotted to the diagnosis code
that occurred.
360: Physical address
(Equipment that is communicating code)
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
BE–157
LEXUS RX300 (RM785E)
S
The following illustration below is an example of when diagnosis code ”D1” appears on the code (190)
and (240 or 360) equipment. (Communication error occurs between the radio receiver and CD chang-
er.)
(e)
Diagnosis memory clear
(1)
After error is fixed, start up the diagnosis mode.
(2)
Continue pressing TRACK TURN APS switch ”5” for 2 secs. (CLr is displayed.)
(3)
Press the TRACK TURN APS switch ”2” and transfer to the diagnosis memory mode and check
that the normal code (00) is output.
DTC
Diagnosis item
Diagnosis content
Countermeasure
and inspected parts
41
D1
FF
60
AM tuner error
There is an error in AM tuner.Radio receiver check.
FM tuner error
42
50 Cassette error
Transmitter error
D4
Periodic
communication error
Diagnosis no response
CD error
61 EJECT error
62
63
64
67
DISC inside out/flaw
Pickup temperature
detection
Excessive current
detection
Tray insertion/
discharging error
There is an error in FM tuner.
There is an error in cassette
deck.
Communication with the
equipment that is
communicating has failed
successively.
Connection confirmation
has not come from the
equipment that is
communicating
Result of diagnosis is not
issued from start to finish.
Error codes other than
61–69 are detected.
CD is not ejected.
CD is inserted inside
out or it has a flaw.
High temperature of CD
changer is detected.
Excessive current to
CD changer is detected.
An error occurs in insertion
and discharging operation of
CD changer tray.
Radio receiver check.
CD changer check.
CD changer check.
Magazine check.
CD check.
CD changer check.
CD changer check.
Magazine check.
Radio receiver check.
Wire harness and
connecter check.
CD
(240)
(360)
System
Check
Diagnosis
memory
X
X
f
f
f
X
f
f
X
f
f
X
X
f
X
X
X
X
X
f
f
f
f
f
Head
Unit
(190)
Parts
Name
21
22
ROM error
RAM error
There is an error on
internal ROM.
There is an error on
internal RAM.
f
X
f
X
51 Cassette eject error
Cassette can not be ejected
from Head Unit.
f
X
21
22
ROM error
RAM error
There is an error on
internal ROM.
There is an error on
internal RAM.
f
X
f
X
D2
Periodic
communication
no response
Error in periodic
communication.
D Wire harness and
connector
f
X
D Radio receiver check.
D Wire harness check.
BE–158
–
BODY ELECTRICAL
AUDIO SYSTEM (Except Europe)
LEXUS RX300 (RM785E)
2.
DIAGNOSIS CODE LIST
S
If there is ”O” in the column of system check, an error can be detected when the mode is switched to
the system check mode.
S
If there is ”O” in the column of diagnosis mode, each unit is monitring whether or not it has failure. In
case of detecting failure, it memorizes DTC.
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