AVC-LAN Circuit

DESCRIPTION

Each audio system component connected to the AVC-LAN (communication bus) transfers switch signals via the audio visual communication local area network.

If a short to +B or short to ground occurs in the AVC-LAN, the audio system will not function normally as communication is stopped.

INSPECTION PROCEDURE

PROCEDURE

INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the H82, H85 and H83 radio receiver assembly connectors.

Text in Illustration
*a	Component without harness connected (Radio Receiver Assembly)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H82-5 (ATX+) - H82-15 (ATX-)	Always	60 to 80 Ω
H85-9 (TXM+) - H85-10 (TXM-)	Always	60 to 80 Ω
H83-9 (TX+) - H83-10 (TX-)	Always	60 to 80 Ω

NG

REPLACE RADIO RECEIVER ASSEMBLY Click here

OK

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - EACH COMPONENT)
Tech Tips

For details of the connectors, refer to Terminals of ECU Click here.
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.
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
INSPECT MALFUNCTIONING PARTS
1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.
  Tech Tips
  - 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
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

OK

REPLACE MALFUNCTIONING PARTS

AUDIO AND VISUAL SYSTEM (w/o Multi-display) AVC-LAN Circuit