AVC-LAN Circuit: Description

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Each unit of the navigation 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 navigation system will not function normally as the communication is discontinued.

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

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

Resistance

CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
ATX+ (R2-5) - ATX- (R2-15)	Always	60 to 80 Ω
TX+ (R3-9) - TX- (R3-10)	Always	60 to 80 Ω
TX+ (R4-9) - TX- (R4-10)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER

Fig 1: Identifying Radio Receiver Connectors Connector terminals

OK: GO TO NEXT STEP.

CHECK HARNESS AND CONNECTOR
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.
    OK: There is no open or short circuit.
    
    Fig 2: AVC-LAN Communication - Wiring Diagram (With Rear Seat Entertainment System)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 3: AVC-LAN - Wiring Diagram (Without Rear Seat Entertainment System)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL