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 (GATEWAY ECU - COMPONENT SHOWN BY SUB-CODE)
REPLACE COMPONENT SHOWN BY SUB-CODE
AUDIO AND VISUAL SYSTEM - Gateway ECU Communication Error
INSPECTION PROCEDURE
| 1.IDENTIFY THE COMPONENT SHOWN BY SUB-CODE |
Enter the diagnostic mode.
Press the preset switch "3" to change to "Detailed Information Mode".
Identify the component shown by the sub-code.
"190 (radio receiver)" is the component shown by the sub-code in the example shown in the illustration.
For details of the DTC display, refer to "DTC CHECK/CLEAR" .
| 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:| Component | Proceed to |
| Integration control & panel assembly (1D8) | Integration control & panel assembly power source circuit |
| Stereo component amplifier (440) | Stereo component amplifier power source circuit |
| Radio receiver (190) | Radio receiver power source 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 |
| 4.CHECK HARNESS AND CONNECTOR (GATEWAY ECU - COMPONENT SHOWN BY SUB-CODE) |
Start the check from the circuit that is near the component shown by the sub-code first.
For details of the connectors, refer to the "TERMINALS OF ECU" .
Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the gateway ECU and the component shown by the sub-code.
Disconnect all connectors between the gateway ECU and the component shown by sub-code.
Check for an open or short in the AVC-LAN circuit between the gateway ECU and the component shown by the sub-code.
- OK:
- There is no open or short circuit.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 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.
LEXUS IS250, IS220d / GSE20 ALE20
