Page 777 of 4500
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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4c0057000f0003005600520058005100470003004600440051[<00030051005200570003004500480003004b00480044005500470003004900550052005000030057004b004800030056005300480044004e00480055000300480059004800510003004c004900030057004b0048005500480003004c005600030051005200
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malfunction in the stereo component amplifier assy or speaker.
WIRING DIAGRAM
Page 778 of 4500
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
Page 779 of 4500
Fig. 61: Identifying Radio Receiver Assy - Stereo Component Amplifier Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 780 of 4500
Fig. 62: Radio Component Amplifier Assy
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Page 781 of 4500
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
Page 782 of 4500
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
Page 783 of 4500
Fig. 65: Radio Receiver Assy - Stereo Component Tuner Terminal Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Page 784 of 4500
Fig. 66: Identifying Stereo Components Tuner Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit is necessary for the stereo component amplifier assy for the ASL (Auto Sound Leveliser). Speed
signals are received from the combination meter.
The ASL function automatically adjusts the sound data in order to enable to hear the clear audio sound even
when the vehicle noise is increased (as vehicle noise increased, the volume is turned up etc.)
Standard System: Using speed signals and a microphone for the ASL built into the stereo component amplifier
assy.
Mark Levinson System: Using speed signals.