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.
  HINT:
  - The "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 " .
    
    Fig 1: Multi-Display Screen - System Check Mode And LAN Monitor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

COMPONENTS REFERENCE TABLE

Component	Proceed to
Multi-display Controller (16C, 16D)	MULTI-DISPLAY CONTROLLER COMMUNICATION ERROR

INSPECT MULTI-DISPLAY CONTROLLER

Disconnect the multi-display connectors.

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

Resistance

RESISTANCE SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
TX+ (R26-1) - TX- (R26-6)	Always	60 to 80 Ω
TX2+ (R17-5) - TX2- (R17-4)	Always	60 to 80 Ω
TX3+ (R15-17) TX3- (R15-18)	Always	60 to 80 Ω
TX4+ (R16-14) TX4-(R16-13)	Always	60 to 80 Ω

Fig 2: Identifying Multi-Display Connectors

NG: REPLACE MULTI-DISPLAY CONTROLLER

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.
  
  Fig 3: AVC-LAN Wiring Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Check for 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.
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