2003 LEXUS LS430 Factory Repair Manual

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Page 713 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 9: Identifying Fade Out Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Noise problem
It is very important for a technician to understand the specifics of the noise problem. To diagnose t

Page 714 of 4500

LEXUS LS430 2003 Factory Repair Manual 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:
Befor

Page 715 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 10: Identifying Audio Function Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REAR AUDIO AND REAR A/C CONTROL SW FUNCTION

Page 716 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 11: Identifying Rear Audio And Rear A/C Control SW Function Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
STEERING PAD FUNCTION
Fig. 12: Identifying Steering Pad Function Chart

Courtesy

Page 717 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 14: TERMINAL DESCRIPTION CHART
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.STEREO COMPONENT AMPLIFIER ASSY
Fig. 15: Stereo Component Amplifier Assy ECU Terminal Connector

Courtesy of TOYO

Page 718 of 4500

LEXUS LS430 2003 Factory Repair Manual 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

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-

Page 719 of 4500

LEXUS LS430 2003 Factory Repair Manual 3.STEREO COMPONENT TUNER
(S30-16)W-BLeft)
FR+ (S30-5) - GND
(S30-16)LG - W-BSound signal (Front
Right)Audio system is playing-
RL+ (S30-6) - GND
(S30-16)B - W-BSound signal (Rear
Left)Audio syste

Page 720 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 16: Stereo Component Tuner ECU Terminal Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TERMINAL DESCRIPTION CHART
Symbols (Terminal
No.)Wiring ColorTerminal DescriptionConditionSpecif

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