Navigation System - Stereo Component Amplifier Communication Error

Lexus IS250 IS220d GSE20 ALE20 - NAVIGATION

INSPECTION PROCEDURE

IDENTIFY THE COMPONENT SHOWN BY SUB-CODE

CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

INSPECT RADIO RECEIVER

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMPONENT SHOWN BY SUB-CODE)

REPLACE COMPONENT SHOWN BY SUB-CODE

NAVIGATION SYSTEM - Stereo Component Amplifier Communication Error

INSPECTION PROCEDURE

1.IDENTIFY THE COMPONENT SHOWN BY SUB-CODE
Navigation System - Stereo Component Amplifier Communication Error. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

Enter the diagnostic mode.

Press the "LAN Mon" switch to change to "LAN Monitor" mode.

Identify the component shown by the sub-code.

  • HINT:
"110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
The sub-code will be indicated by its physical address.
For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION" .
NEXT
2.CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

Inspect the power source circuit of the component shown by the sub-code.


If the power source circuit is operating normally, proceed to the next step.

Component Table:
ComponentProceed to
Radio receiver (190)Radio receiver power source circuit
Gateway ECU (1C6)Gateway ECU power source circuit
Multi-display (110)Multi-display power source circuit
Navigation ECU (178)Navigation ECU power source circuit
Television camera ECU (1AC)Television camera ECU power source circuit
NEXT
3.INSPECT RADIO RECEIVER
Navigation System - Stereo Component Amplifier Communication Error. 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
4.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMPONENT SHOWN BY SUB-CODE)
  • HINT:
Start the check from the circuit that is near the component shown by the sub-code first.
For details of the connectors, refer to "TERMINALS OF ECU" .

Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.


Disconnect all connectors between the stereo component amplifier and the component shown by sub-code.

Check for an open or short in the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.

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

Navigation System - Stereo Component Amplifier Communication Error. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.REPLACE COMPONENT SHOWN BY SUB-CODE

Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.

  • OK:
  • Same problem does not occur.
NG
REPLACE STEREO COMPONENT AMPLIFIER
OK
END