Inspection Procedure

1. Disconnect the radio and navigation assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   ATX+ (R15-5) - ATX- (R15-15)	Always	60 to 80 Ω
   TX+ (R14-9) - TX- (R14-10)	Always	60 to 80 Ω

Fig 1: Identifying Radio And Navigation Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE RADIO AND NAVIGATION ASSEMBLY 

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 all AVC-LAN circuits.
   1. Check for an open or short in all AVC-LAN circuits.
      Fig 2: AVC-LAN Circuit - Warning Diagram

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      OK: There is no open or short circuit. 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE