radio LEXUS LS430 2003 Factory Owner's Manual

Fig. 9: Identifying Fade Out Area
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3. Noise problem
It is very important for a technician to understand the specifics of the noise problem. To diagnose the
symptom, use the table below.
RADIO FREQUENCY CHART
Radio FrequencyNoise occurrence conditionPresumable cause
AMNoise occurs in a specified areaForeign noise
AMNoise occurs when listening to an
intermittent broadcastAn identical program transmitted from
multiple towers can cause noise where
the signals overlap
FMNoise occurs only at nightMusic beat from a far-off broadcast
FMNoise occurs while driving in a specified
areaMulti-path or phasing noise resulting
from a change in FM frequency

HINT:
If the noise does not fall into any category in the table above, determine the cause using "Radio reception
problems" above. Refer to the multi-path and phasing sections.
HINT:
Before performing verification listed in the table below, check the fuse and relay.
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
AUDIO FUNCTION

Fig. 11: Identifying Rear Audio And Rear A/C Control SW Function Chart
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STEERING PAD FUNCTION
Fig. 12: Identifying Steering Pad Function Chart

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1.RADIO RECEIVER ASSY
Fig. 13: Radio Receiver Assy ECU Terminal Connector

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Symbols (Terminal
No.)Wiring
Color
Terminal DescriptionConditionSpecification
WFL+ (S28-3) - GND
(S30-16)LG - W-BSound signal (Front
Left)Audio system is playing-
WFR+ (S28-4) - GND
(S30-16)Y - W-BSound signal (Front
Right)Audio system is playing-
WFL-(2) (S28-9) -
GND (S30-16)L - W-BSound signal (Front
Left)Audio system is playing-
WFR-(2) (S28-10) -
GND (S30-16)B - W-BSound signal (Front
Right)Audio system is playing-
MUTE (S29-1) - GND
(S30-16)Y - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
L- (S29-2) - GND
(S30-16)G - W-BSound signal from
radio receiver (Left)Audio system is playing-
L+ (S29-3) - GND
(S30-16)R - W-BSound signal from
radio receiver (Left)Audio system is playing-
R- (S29-4) - GND
(S30-16)W - W-BSound signal from
radio receiver (Right)Audio system is playing-
R+ (S29-5) - GND
(S30-16)B - W-BSound signal from
radio receiver (Right)Audio system is playing-
TX-(1), MTX-(2) (S29-
7) - GND (S30-16)LG - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TX+(1), MTX+(2)
(S29-8) - GND (S30-
16)L - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
ACC (S29-12) - GND
(S30-16)GR - W-BAccessory (ON)Turn ignition switch to
OFF --> ACCBelow 1 V -->
10 to 14 V
SPD (S29-11) - GND
(S30-16)O - W-BSpeed signal from
combination meterVehicle is drivingPulse generation
TXD-(1), RTX-(2)
(S29-19) - GND (S30-
16)R - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TXD+(1), RTX+(2)
(S29-20) - GND (S30-
16)G - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
N-MUT(1), N-MU(2)
(S29-21) - GND (S30-
16)SB - W-B
(
(3))
Mute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
TMUT (S29-24) -
GND (S30-16)LG - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
B+(1), +B(2) (S30-1) -
GND (S30-16)L-R - W-BBatteryAlways10 to 14 V
FL+ (S30-4) - GND LG(3), P(4) - Sound signal (Front Audio system is playing-

Fig. 16: Stereo Component Tuner ECU Terminal Connector
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TERMINAL DESCRIPTION CHART
Symbols (Terminal
No.)Wiring ColorTerminal DescriptionConditionSpecification
B (S31-1) - GND
(S31-25)L - W-BBatteryAlways10 to 14 V
SG (S31-2) - Body
groundShielded -
Body groundGroundAlwaysBelow 1 ohms
FR+ (S31-3) - GND
(S31-25)G - W-BSound signal (Front
Right)Audio system is
playing-
FL+ (S31-4) - GND
(S31-25)W - W-BSound signal (Front
Left)Audio system is
playing-
ATX+ (S31-8) -
GND (S31-25)G - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
MTX+ (S31-9) -
GND (S31-25)Y - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
UTX+ (S31-10) -
GND (S31-25)
(1)L - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
MUTE (S31-11) -
GND (S31-25)P - W-BMute signal from radio
receiverAudio system is
sounding -->
ChangingAbove 3.5 V -->
Below 3.5 V
ACC (S31-14) -
GND (S31-25)GR - W-BAccessory (ON)Turn ignition switch to
OFF --> ACCBelow 1 V 10 to 14
V
FR- (S31-16) - GND
(S31-25)R - W-BSound signal (Rear
Right)Audio system is
playing-
FL- (S31-17) - GND
(S31-25)B - W-BSound signal (Rear
Left)Audio system is
playing-
UTX- (S31-22) -
GND (S31-25)
(1)LG - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V

1.RADIO RECEIVER ASSY (Physical address: 190) [AUDIO H/U]
a. Logical address: 01 (Communication control)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 25: DTC Detecting Condition Chart

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HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.

Fig. 30: DTC Detecting Condition Chart (Audio And Rear A/C Control SW)
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HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.
*4: This code may be stored if the ignition key is held in the START position for one minute
or more before returning to the ON position.
*5: If the device is reported as not existing during verification, check the power source circuit
and AVC-LAN circuit for the device.
4.GATEWAY ECU (Physical address: 1C6) [G/W]
a. Logical address: 01 (Communication control)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 31: DTC Detecting Condition Chart

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HINT:
This code is stored 210 seconds after the power supply connector of the master component is
disconnected with the ignition switch in the ACC or ON position.
5.STEREO COMPONENT TUNER (Physical address: 1FO) [RADIO TUNER]
a. Logical address: 01 (Communication control)
HINT:

Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 32: DTC Detecting Condition Chart [RADIO Tuner]

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HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.
*4: This code may be stored if the ignition key is held in the START position for one minute
or more before returning to the ON position.
*5: If the device is reported as not existing during verification, check the power source circuit
and AVC-LAN circuit for the device.
b. Logical address: 60 (Radio)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 33: DTC Detecting Condition Chart

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INSPECTION PROCEDURE
1.CHECK CABIN
a. Check that conditions in the cabin are likely to cause condensation.
HINT:
This problem occurs when the cabin is humid and the temperature changes rapidly. This may produce
condensation, resulting in a short circuit.
OK: Condensation is not likely.
NG: DRY CABIN AND RECHECK CONDITIONS
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
2 CHECK AUDIO SETTINGS
OK: END
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
INSPECTION PROCEDURE
1.CHECK RADIO RECEIVER ASSY
a. Check the radio's automatic search function.
1. Check the radio's automatic station search function by activating it.
OK: The radio's automatic station search function works properly.
OK: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
NG: Go to next step
2.CHECK OPTIONAL COMPONENTS
a. Check the optional components (sun-shade film, telephone antenna, etc.)
1. Check if optional components, such as sun-shade film or telephone antenna that ma
y