radio LEXUS LS430 2003 Factory Service Manual

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CIRCUIT DESCRIPTION
This circuit provides the power to the radio receiver assy.
WIRING DIAGRAM
Fig. 43: Identifying Power Source Circuit (Radio Receiver Assy) Wiring Diagram

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INSPECTION PROCEDURE
1.INSPECT RADIO RECEIVER ASSY (+B, ACC, GND)

a. Disconnect the radio receiver assy connector R2.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION CONDITION CHART
c. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE or DIAGNOSTIC TROUBLE CODE CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
+B - GNDAlways10 to 14V
ACC - GNDIgnition SW ACC10 to 14V

Fig. 44: Disconnecting Radio Receiver Assy Connector R2
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CIRCUIT DESCRIPTION
This circuit provides the power to the stereo component tuner.
WIRING DIAGRAM

Fig. 59: Measuring Resistance Between Terminals Of Speaker
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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
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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
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Fig. 62: Radio Component Amplifier Assy
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Fig. 63: Identifying Stereo Components Amplifier
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The stereo component tuner sends a sound signal to the radio receiver assy through this circuit.
WIRING DIAGRAM

Fig. 64: Identifying Radio Receiver Assy - Stereo Component Tuner Wiring Diagram
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INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT
TUNER)
a. Disconnect the connectors from the radio receiver assy R3 and stereo component tuner S31.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionSpecified condition
RR+ - FR+Below 1 ohms
RR- - FR-Below 1 ohms
RL+ - FL+Below 1 ohms
RL- - FL-Below 1 ohms
RR+ - Body ground10 kohms or higher
RR- - Body ground10 kohms or higher
RL+ - Body ground10 kohms or higher
RL- - Body ground10 kohms or higher

Fig. 65: Radio Receiver Assy - Stereo Component Tuner Terminal Connector
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR