Audio Visual. Audio And Visual System Avc-Lan Circuit

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20

Audio Visual. Lexus Is250, Is220D. Gse20 Ale20

AUDIO AND VISUAL SYSTEM - AVC-LAN Circuit

DESCRIPTION

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.
When a short to +B or short to ground occurs in this AVC-LAN, the audio system will not function normally as the communication is discontinued.

INSPECTION PROCEDURE

1.INSPECT RADIO RECEIVER

Lexus Is250, Is220D. Gse20 Ale20.Audio Visual.Audio And Visual System.Audio And Visual System Avc-Lan Circuit

Disconnect the radio receiver connectors.

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
ATX+ - ATX-
Always
60 to 80 Ω
TXM+ - TXM-
Always
60 to 80 Ω
TX+ - TX-
Always
60 to 80 Ω

REPLACE RADIO RECEIVER

OK

2.CHECK HARNESS AND CONNECTOR

HINT:

For details of the connectors, refer to the "TERMINALS OF ECU" (Click here).

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.

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Tester Connection	Condition	Specified Condition
ATX+ - ATX-	Always	60 to 80 Ω
TXM+ - TXM-	Always	60 to 80 Ω
TX+ - TX-	Always	60 to 80 Ω