2003 LEXUS LS430 Identifying ac

Fig. 50: Identifying Audio And Rear A/C Control SW Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT AUDIO AND REAR A/C CONTROL SWITCH (+B, ACC, GND)
a. Disconnect the audio and rear A/C control switch connector A35.
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.
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
+B - GNDAlways10 to 14V

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

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. 63: Identifying Stereo Components Amplifier
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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