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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: Screen Display - 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:

COMPONENTS REFERENCE CHART

Component	Proceed to
Radio receiver (190)	Radio receiver power source circuit (see RADIO RECEIVER POWER SOURCE CIRCUIT )
Stereo component amplifier (440)	Stereo component amplifier power source circuit (see STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
Multi-display (110)	Multi-display power source circuit (see MULTI-DISPLAY POWER SOURCE CIRCUIT )
Gateway ECU (1C6)	Gateway ECU power source circuit (see GATEWAY ECU POWER SOURCE CIRCUIT )

INSPECT RADIO RECEIVER ASSEMBLY

Fig 2: Identifying K53, K54 And K56 Receiver Connectors

G05820082

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K53, K54 and K56 receiver connectors.

Measure the resistance of the receiver.

Standard resistance

STANDARD 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 (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