Inspection Procedure

1. Refer to the MULTI-DISPLAY POWER SOURCE CIRCUIT  .

   If the power source circuit is operating normally, proceed to the next step.

Fig 1: Identifying Radio Receiver Connectors Terminals

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1. Disconnect the K53, K54 and K56 receiver connectors.
2. 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 

1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component which has stored this code.

   Component table 

   COMPONENT DESCRIPTION
   
   

   Display	Component
   AUDIO H/U	Radio receiver
   DSP-AMP	Stereo component amplifier
   G/W	Gateway ECU
   NAVI	Navigation ECU

   HINT:

   "NAVI" is the component which has stored this code in the example shown in the illustration.

Fig 2: Identifying LAN Monitor Mode

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HINT:

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 multi-display and the component which has stored this code.
   1. Disconnect all connectors between the multi-display and the component which has stored this code.
   2. Check for an open or short in the AVC-LAN circuit between the multi-display and the component which has stored this 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 

HINT:

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 multi-display and the radio receiver.
   1. Disconnect all connectors between the multi-display and the radio receiver.
   2. Check for an open or short in the AVC-LAN circuit between the multi-display and the radio receiver.

      OK: 

      There is no open or short circuit. 

Fig 4: AVC-LAN Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the multi-display with a normal one and check if the same problem occurs again.

   OK: 

   Same problem does not occur. 

NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE 

OK: END