Navigation System - Avc-Lan Circuit

Lexus IS250 IS220d GSE20 ALE20 - NAVIGATION

DESCRIPTION

INSPECTION PROCEDURE

INSPECT RADIO RECEIVER

CHECK HARNESS AND CONNECTOR

NAVIGATION SYSTEM - AVC-LAN Circuit

DESCRIPTION

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.


INSPECTION PROCEDURE

1.INSPECT RADIO RECEIVER
Navigation System - Avc-Lan Circuit. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

Disconnect the radio receiver connectors.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    ATX+ (J66-5) -
    ATX- (J66-15)    		Always60 to 80 Ω
    TX+ (J63-9) -
    TX- (J63-10)    		Always60 to 80 Ω
NG
REPLACE RADIO RECEIVER
OK
2.CHECK HARNESS AND CONNECTOR
  • HINT:
  • For details of the connectors, refer to "TERMINALS OF ECU" .

Referring to the AVC-LAN wiring diagram below, check all AVC-LAN circuits.


Disconnect all connectors in all AVC-LAN circuits.

Check for an open or short in all AVC-LAN circuits.

  • OK:
  • There is no open or short circuit.

Navigation System - Avc-Lan Circuit. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE