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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: LAN Monitor" mode
  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 DESCRIPTION CHART

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
Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER ASSEMBLY

Fig 2: Inspecting Radio Receiver Assembly

G05299766

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K53, K54 and K56 receiver connectors.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATIONS

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

NG: REPLACE RADIO RECEIVER ASSEMBLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (NAVIGATION 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 navigation ECU and the component shown by the sub-code.
  1. Disconnect all connectors between the navigation ECU and the component shown by sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the navigation ECU 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
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 NAVIGATION ECU

OK: END