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Multi-display Controller 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
Radio receiver (190)	(SeeRADIO RECEIVER POWER SOURCE CIRCUIT )
Stereo component amplifier (440)	(See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
Multi-display (110)	(SeeMULTI-DISPLAY POWER SOURCE CIRCUIT )
Navigation ECU (178)	(See NAVIGATION ECU POWER SOURCE CIRCUIT )
Television camera ECU (280)	(SeeTELEVISION CAMERA ECU POWER SOURCE CIRCUIT )
Gateway ECU (1C6)	Gateway ECU power source circuit (See DTC B1293 GATEWAY ECU COMMUNICATION STOP )

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

G04093062

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER

OK: Go to next step

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - 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 multi-display controller and the component shown by the sub-code.
  1. Check for an open or short in the AVC-LAN circuit between the multi-display controller 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 MULTI-DISPLAY CONTROLLER

OK: END