Inspection Procedure

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: Identifying Radio Receiver

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

HINT:

For details of the connectors, refer to the "TERMINALS OF ECU " .

1. Referring to the AVC-LAN wiring diagram below, check all AVC-LAN circuits.
   1. Disconnect all connectors in all AVC-LAN circuits.
   2. Check for an open or short in all AVC-LAN circuits.

      OK : 

      There is no open or short circuit. 

      Fig 2: AVC-LAN Circuit - Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : GO TO NEXT STEP 

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE