Multi-Display Communication Error: Procedure

IDENTIFY THE COMPONENT SHOWN BY SUB-CODE
1. Enter the diagnostic mode.
  
  Fig 1: Identifying LAN Monitor Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.
  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 .
NEXT: Go to next step

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	Proceed to
Radio receiver (190)	Refer to Radio Receiver Power Source Circuit
Stereo component amplifier (440)	Refer to Stereo Component Amplifier Power Source Circuit
Navigation ECU (178)	Refer to Navigation ECU Power Source Circuit

NEXT: Go to next step

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

Fig 2: Identifying Radio Receiver Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

Tester Connection	Condition	Specified Condition
ATX+ (E69-5) - ATX- (E69-15)	Always	60 to 80 Ω
TX+ (E70-9) - TX- (E70-10)	Always	60 to 80 Ω

NG → REPLACE RADIO RECEIVER

OK: Go to next step

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - 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 toTERMINALS OF ECU .
1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display and the component shown by the sub-code.
  1. Disconnect all connectors between the multi-display and the component shown by sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the multi-display and the component shown by the sub-code.
    OK
    
    There is no open or short circuit.
    
    Fig 3: View Of AVC-LAN Wiring Diagram
    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

OK → END