2003 LEXUS LS430 ignition

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

c. Measure the voltage according to the value (s) in the table below.
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
Fig. 46: Inspecting Stereo Component Tuner

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CIRCUIT DESCRIPTION
This circuit provides the power to the stereo component amplifier ass
y.
Tester connectionConditionSpecified condition
B - GNDAlways10 to 14V
ACC - GNDIgnition SW ACC10 to 14V

c. Measure the voltage according to the value (s) in the table below.
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
Fig. 48: Disconnecting Stereo Component Amplifier Assy Connector S29, S30

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester connectionConditionSpecified condition
B+ ((1)),+B ((2)) - GNDAlways10 to 14V
B+ ((1)), +B2 ((2)) -GNDAlways10 to 14V
ACC - GNDIgnition SW ACC10 to 14V
(1)Mark Levinson models
(2)Standard models

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE or DIAGNOSTIC TROUBLE CODE CHART
Fig. 51: Inspecting Audio And Rear A/C Control Switch (+B, ACC, Gnd)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CIRCUIT DESCRIPTION
The sound signal that has been amplified by the stereo component amplifier assy is sent to the speaker from the
stereo component amplifier ass
y through this circuit.
ACC - GNDIgnition SW ACC10 to 14V

TESTER CONNECTION CONDITION CHART
Fig. 71: Inspecting Combination Meter Assy

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester connectionConditionSpecification
+S - Body groundIgnition switch ONVoltage is pulsed

Fig. 73: Stereo Component Amplifier Assy Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT STEREO COMPONENT AMPLIFIER ASSY
a. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
MUTE - Body
groundTurn ignition switch to ACC. Audio system is playing -->
ChangingAbove 3.5 V --> Below
1 V

WIRING DIAGRAM
Fig. 79: Identifying Radio Receiver Assy
- Stereo Component Tuner Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT STEREO COMPONENT TUNER
a. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
NG: Go to step 2
Tester connectionConditionSpecified condition
MUTE - Body
groundTurn ignition switch to ACC. Audio system is playing -->
ChangingAbove 3.5 V --> Below
1 V

Fig. 82: Identifying Stereo Receiver Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
INSPECTION PROCEDURE
1.READ VALUE OF HAND-HELD TESTER
a. Connect the hand-held tester to DLC3.
b. Turn the ignition switch ON and push the hand-held tester main switch ON.
c. Select the items below in the DATA LIST, and read the displays on the hand-held tester.
SPAD: