Multi-display Controller Communication Error

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

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 REFERENCE

Component	Proceed to
Radio receiver (190)	RADIO RECEIVER POWER SOURCE CIRCUIT
Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT
Navigation ECU (178)	NAVIGATION ECU POWER SOURCE CIRCUIT
Television camera ECU (280)	TELEVISION CAMERA ECU POWER SOURCE CIRCUIT
Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

Measure the resistance according to the value(s) in the table below.

Resistance

CONNECTOR TERMINAL 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 Connectors Connector terminals

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 Communication - Wiring Diagram (With Rear Seat Entertainment System)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 4: AVC-LAN - 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