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Radio Receiver Communication Error

IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE
1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.
  
  Fig 1: Multi-Display Screen - System Check Mode And LAN Monitor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - "110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
  - The sub-code will be indicated by its physical address.
  - For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .

CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

Inspect the power source circuit of the component shown by the sub-code.
If the power source circuit is operating normally, proceed to the next step.

Component Table

COMPONENT CHART

Component	Proceed to
Gateway ECU (1C6)	Gateway ECU power source circuit (See DTC B1293 GATEWAY ECU COMMUNICATION STOP )
Stereo component amplifier (440)	(See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
Multi-display (110)	See MULTI-DISPLAY POWER SOURCE CIRCUIT
Navigation ECU (178)	(See NAVIGATION ECU POWER SOURCE CIRCUIT )
Television camera ECU (280)	(See TELEVISION CAMERA ECU POWER SOURCE CIRCUIT )
Multi-display controller (1F6)	(SeeMULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT )

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.
Measure the resistance according to the value(s) in the table below.

Resistance

TERMINALS RESISTANCE SPECIFICATION

Tester connection	Condition	Specified Condition
ATX+ (R2-5) - ATX- (R2-15)	Always	60 to 80 Ω
TX+ (R3-9) - TX- (R3-10)	Always	60 to 80 Ω
TX+ (R4-9) - TX- (R4-10)	Always	60 to 80 Ω

Fig 2: Identifying Radio Receiver Connector terminals

G04093042

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT SHOWN BY SUB-CODE)
HINT:
- Start the check from the circuit that is near the component shown by the sub-code first.
- For details of the connectors, refer to "TERMINALS OF ECU " .
1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.
  1. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.
    OK: There is no open or short circuit.
Fig 3: AVC-LAN - Wiring Diagram (With Rear Seat Entertainment System)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: AVC-LAN Communication - Wiring Diagram (Without Rear Seat Entertainment System)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE COMPONENT SHOWN BY SUB-CODE
1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.
  OK: Same problem does not occur.
NG: REPLACE RADIO RECEIVER

OK: END