Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

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.
    
    Fig 1: Identifying Tester Display - LAN Monitor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - 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:

POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

Component	Proceed to
Radio receiver (190)	RADIO RECEIVER POWER SOURCE CIRCUIT
Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Disc player changer (250)	DISC PLAYER CHANGER POWER SOURCE CIRCUIT
Television display (1B0)	TELEVISION DISPLAY POWER SOURCE CIRCUIT
Television camera ECU (280)	TELEVISION CAMERA ECU POWER SOURCE CIRCUIT
Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT
Navigation ECU (178)	NAVIGATION ECU POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER ASSEMBLY

Fig 2: Identifying Radio Receiver Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the R1, R2 and R3 receiver connectors.

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

Standard resistance

RADIO RECEIVER ASSEMBLY

Tester Connection	Condition	Specified Condition
R3-9 (TXM+) - R3-10 (TXM-)	Always	60 to 80 Ω
R1-5 (ATX+) - R1-15 (ATX-)	Always	60 to 80 Ω
R2-9 (TX+) - R2-10 (TX-)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (GATEWAY ECU - 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 gateway ECU and the component shown by the sub-code.
  
  Fig 3: Identifying AVC-LAN Wiring Diagram
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Disconnect all connectors between the gateway ECU and the component shown by sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the gateway ECU 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 GATEWAY ECU
  
  OK: END