Page 785 of 4500
WIRING DIAGRAM
Fig. 67: Identifying Stereo Component Amplifier Assy Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSY -
COMBINATION METER ASSY)
a. Disconnect the connectors from the stereo component amplifier assy S29 and combination meter
assy C12.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
SPD - +SAlwaysBelow 1 ohms
SPD - Body groundAlways10 kohms or higher
Page 786 of 4500
Fig. 68: Identifying Stereo Components Amplifier Terminal Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 787 of 4500
Fig. 69: Identifying Stereo Components Amplifier Terminal Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Page 788 of 4500
Fig. 70: Identifying Combination Meter Assembly Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
2.INSPECT COMBINATION METER ASSY
a. Check the voltage.
1. Jack up either of the front wheels.
2. Adjust the shift lever to the neutral position.
3. Measure the voltage between the terminals +S and body ground while turning the front wheel
slowly.
Standard:
Page 789 of 4500
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
Page 790 of 4500
Fig. 72: Identifying Blinking Pattern
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NG: GO TO COMBINATION METER SYSTEM (SEE PRECAUTION
)
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit sends the signal to the stereo component amplifier to mute the noise. Because of that, the noise
produced by changing the sound source ceases.
In addition, this circuit is used to mute the sound when the navigation system performs voice guide.
If there is an open in the circuit, noise can be heard from the speaker when changing the sound source.
When the vehicle is equipped with the navigation system, audio sound keeps coming out from the speaker on
the driver's side while the voice navigation is in operation.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
extremely small sound can be produced.
WIRING DIAGRAM
Page 791 of 4500
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
Page 792 of 4500
Fig. 74: Identifying Stereo Component Amplifier Assy Terminal Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.