Inspection Procedure

1. Refer to the DISPLAY AND NAVIGATION ASSEMBLY POWER SOURCE CIRCUIT  .

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

Fig 1: Identifying Radio Receiver Assembly Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L53, L51, L52 or L57 receiver connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   L53-9 (TXM+) - L53-10 (TXM-)	Always	60 to 80 Ω
   L51-5 (ATX+) - L51-15 (ATX-)	Always	60 to 80 Ω
   L52-9 (TX+) - L52-10 (TX-)*1	Always	60 to 80 Ω
   L57-9 (TX+) - L57-10 (TX-)*2	Always	60 to 80 Ω
   HINT: *1: for DVD Changer Models *2: for CD Changer Models

   NG: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL )

   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 

   DISPLAY REFERENCE
   
   

   Display	Component
   AUDIO	Radio receiver
   DSP-AMP	Stereo component amplifier
   CLOCK	Clock
   RSE	Television display
   DVD-P	Disc player
   CAMERA-C	Parking assist ECU
   Rr-CONT	Rear power seat module switch
   XM	Satellite radio tuner

   HINT:

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

   Fig 2: Screen Display - LAN Monitor Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 display and navigation assembly and the component which has stored this code.
   1. Disconnect all connectors between the display and navigation assembly and the component which has stored this code.
   2. Check for an open or short in the AVC-LAN circuit between the display and navigation assembly 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 display and navigation assembly and the radio receiver.
   1. Disconnect all connectors between the display and navigation assembly and the radio receiver.
   2. Check for an open or short in the AVC-LAN circuit between the display and navigation assembly 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 display and navigation assembly with a normal one (see REMOVAL  ) and check if the same problem occurs again.

   OK: 

   Same problem does not occur. 

   NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE 

   OK: END