Inspection Procedure

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

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

NEXT 

1. for 9 Speaker System:

   Disconnect the R5 and R6 receiver connectors.

2. for 6 Speaker System:

   Disconnect the R5 receiver connector.

3. Measure the resistance of the receiver.

   Standard resistance 

   RESISTANCE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   R5--9 (TX1+) - R5--10 (TX1-)*1	60 to 80 Ω
   R5--9 (TX+) - R5--10 (TX-)*2	60 to 80 Ω
   R6-5 (TX+) - R6--15 (TX-)*2	60 to 80 Ω

   HINT:

   • *1: for 6 speaker system
   • *2: for 9 speaker system

NG : REPLACE RADIO RECEIVER 

Fig 1: Inspecting Radio Receiver

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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: 

   G/W GATEWAY COMPONENT DISPLAY CODE CHART
   
   

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

   HINT:

   "G/W" is the component which has stored this code in the example shown in the illustration.

   Fig 2: Identifying Component Which Has Stored Code

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NEXT 

HINT:

For details of the connectors, refer to the "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: Audio And Visual System AVC-LAN - Circuit Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND 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