Page 809 of 4500
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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE
CODE CHART
CIRCUIT DESCRIPTION
Each unit of the radio receiver assy system connected to AVC-LAN (communication bus) communicates by
transferring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, radio receiver assy system will not function normally
as communication is discontinued.
In AVC-LAN, radio receiver assy becomes the communication master, and the radio receiver assy has enough
resistance necessary for transmitting the communication.
Page 810 of 4500
WIRING DIAGRAM
Fig. 92: Identifying Radio Receiver Assy
- Gateway ECU Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT RADIO RECEIVER ASSY
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
TX+ - TX-Always60 to 80 ohms
Page 811 of 4500
Fig. 93: Inspecting Radio Receiver Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - GATEWAY ECU)
a. Disconnect the connector from the radio receiver assy R2 and gateway ECU G3.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
TX+ - GTX+AlwaysBelow 1 ohms
TX- - GTX-AlwaysBelow 1 ohms
TX+ - Body groundAlways10 kohms or higher
Page 812 of 4500
Fig. 94: Identifying Radio Assy Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TX- - Body groundAlways10 kohms or higher
Page 813 of 4500
Fig. 95: Identifying Gateway ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE
CODE CHART
CIRCUIT DESCRIPTION
Each unit of the radio receiver assy system connected to AVC-LAN (communication bus) communicates by
transferring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, radio receiver assy system will not function normally
as communication is discontinued.
Page 814 of 4500
In AVC-LAN, radio receiver assy becomes the communication master, and the radio receiver assy has enough
resistance necessary for transmitting the communication.
WIRING DIAGRAM
Fig. 96: Radio Receiver Assy
- Stereo Component Tuner Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT RADIO RECEIVER ASSY
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
TXM+ - TXM-Always60 to 80 ohms
Page 815 of 4500
Fig. 97: Inspecting Radio Receiver Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT
TUNER)
a. Disconnect the connector 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 connectionConditionSpecified condition
TXM+ - MTX+AlwaysBelow 1 ohms
Page 816 of 4500
Fig. 98: Identifying Radio Receiver Assy - Stereo Component Tuner Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TXM- - MTX-AlwaysBelow 1 ohms
TXM+ - Body groundAlways10 kohms or higher
TXM- - Body groundAlways10 kohms or higher