LEXUS LS430 2003 Factory Repair Manual

Fig. 55: Stereo Component Amplifier Assy - Speaker Assy (Standard Model)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 56: Identifying Wiring Harness Connector Front No.1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 57: Identifying Wiring Harness Connector Front No.2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 58: Identifying Wiring Harness Connector Rear No.2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
2.INSPECT FRONT NO.1 SPEAKER ASSY
a. Resistance check.
1. Measure the resistance between the terminals of the speaker.
Standard:
Standard models: 2 ohms
Mark Levinson models: 8 ohms

NG: REPLACE FRONT NO.1 SPEAKER ASSY (SEE REPLACEMENT )
OK: Go to next step
3.INSPECT FRONT NO.2 SPEAKER ASSY
a. Check that malfunction disappears when another speaker in a good condition is installed.
OK: Malfunction disappears.
HINT:
Connect all the connectors to the speakers.
When there is a possibility that either right or left front speaker is defective, inspect by
interchanging the right one and the left one.
OK: REPLACE FRONT NO.2 SPEAKER ASSY (SEE REPLACEMENT
)
NG: Go to next step
4.INSPECT REAR NO. 1 SPEAKER ASSY
a. Resistance check.
1. Measure the resistance between the terminals of the speaker.
Standard:
Standard models: 4 ohms
Mark Levinson models: 8 ohms
NG: REPLACE REAR NO. 1 SPEAKER ASSY (SEE REPLACEMENT
)
OK: Go to next step
5.INSPECT REAR NO. 2 SPEAKER ASSY
a. Check that malfunction disappears when another speaker in a good condition is installed.
OK: Malfunction disappears.
HINT:
Connect all the connectors to the speakers.
When there is a possibility that either right or left front speaker is defective, inspect by
interchan
ging the right one and the left one.

OK: REPLACE REAR NO. 2 SPEAKER ASSY (SEE REPLACEMENT )
NG: Go to next step
6.INSPECT WOOFER
a. Resistance check.
1. Measure the resistance between the terminals of the speaker.
Standard:
TESTER CONNECTION CONDITION CHART
NG: REPLACE WOOFER (SEE REPLACEMENT
)
Tester connectionSpecified Condition
1 - 32 ohms(1)
2 - 42 ohms(1)
1 - 214.5 7ohms(2)
(1)Standard models
(2)Mark Levinson models

Fig. 59: Measuring Resistance Between Terminals Of Speaker
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The radio receiver assy sends a sound signal to the stereo component amplifier assy through this circuit. The
sound signal that has been sent is amplified by the stereo component amplifier assy, and then is sent to the
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malfunction in the stereo component amplifier assy or speaker.
WIRING DIAGRAM

Fig. 60: Identifying Radio Receiver Assy - Amp Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT
AMPLIFIER ASSY)
a. Disconnect the connectors from the radio receiver assy R2 and stereo component amplifier assy
S29.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionSpecified condition
L+ (R2) - L+ (S29)Below 1 ohms
L- (R2) - L- (S29)Below 1 ohms
R+ (R2) - R+ (S29)Below 1 ohms
R- (R2) - R- (S29)Below 1 ohms
L+ (R2 or S29) - Body ground10 kohms or higher
L- (R2 or S29) - Body ground10 kohms or higher
R+ (R2 or S29) - Body ground10 kohms or higher
R- (R2 or S29) - Body ground10 kohms or higher

Fig. 61: Identifying Radio Receiver Assy - Stereo Component Amplifier Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 62: Radio Component Amplifier Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.