AVC-LAN Circuit: Procedure

INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the radio receiver assembly connectors.

Fig 1: Measuring Resistance Of Radio Receiver Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard Resistance

W/ BACK DOOR SPEAKER

Tester Connection	Condition	Specified Condition
E2-5 (ATX+) - E2-15 (ATX-)	Always	60 to 80 Ω
E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

W/O BACK DOOR SPEAKER

Tester Connection	Condition	Specified Condition
E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

TEXT IN ILLUSTRATION

*A	w/ Back Door Speaker
*a	Component without harness connected (Radio Receiver Assembly)

NG → See step 4

OK: Go to next step

CHECK HARNESS AND CONNECTOR
HINT:

For details of the connectors, refer to Terminals of ECU. Refer to TERMINALS OF ECU .
1. Referring to the following AVC-LAN wiring diagram, 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: Identifying AVC-LAN Wiring Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL
INSPECT MALFUNCTIONING PARTS
1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.
  HINT:
  - Check all slave units.
  - When disconnecting a slave unit causes the master unit to return to normal operation, this indicates that the slave unit is malfunctioning. Replace the malfunctioning slave unit.
  OK
  
  Master unit returns to normal operation.
NG → See step 3

OK → REPLACE MALFUNCTIONING PARTS