April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

IDENTIFY COMPONENT SHOWN BY 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:
  - "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: Diagnostic Tool Display - System Check Mode And LAN Monitor Screen
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:

COMPONENT TABLE

Component	Proceed to
Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT
Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER ASSEMBLY

Fig 2: Identifying Radio Receiver Connector Terminals

G05299432

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K53, K54 and K56 receiver connectors.

Measure the resistance of the receiver.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
K53-9 (TXM+) - K53-10 (TXM-)	60 to 80 Ω
K54-5 (ATX+) - K54-15 (ATX-)	60 to 80 Ω
K56-9 (TX+) - K56-10 (TX-)	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY

OK: Go to next step

CHECK WIRE HARNESS (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. Disconnect all connectors between the radio receiver and the component shown by sub-code.
  2. 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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE COMPONENT SHOWN BY SUB-CODE WITH NORMAL ONE AND CHECK
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 ASSEMBLY

OK: END