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 (NAVIGATION ECU - COMPONENT SHOWN BY SUB-CODE)
REPLACE COMPONENT SHOWN BY SUB-CODE
NAVIGATION SYSTEM - Navigation ECU Communication Error
INSPECTION PROCEDURE
| 1.IDENTIFY THE COMPONENT SHOWN BY SUB-CODE |
Enter the diagnostic mode.
Press the "LAN Mon" switch to change to "LAN Monitor" mode.
Identify the component shown by the sub-code.
"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" .
| 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 |
| Radio receiver (190) | Radio receiver power source circuit |
| Stereo component amplifier (440) | Stereo component amplifier power source circuit |
| Multi-display (110) | Multi-display power source circuit |
| Gateway ECU (1C6) | Gateway ECU power source circuit |
| Television camera ECU (1AC) | Television camera ECU 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+ (J66-5) -
ATX- (J66-15) | Always | 60 to 80 Ω |
TX+ (J63-9) -
TX- (J63-10) | Always | 60 to 80 Ω |
| 4.CHECK HARNESS AND CONNECTOR (NAVIGATION 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 "TERMINALS OF ECU" .
Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the navigation ECU and the component shown by the sub-code.
Disconnect all connectors between the navigation ECU and the component shown by sub-code.
Check for an open or short in the AVC-LAN circuit between the navigation ECU and the component shown by the sub-code.
- OK:
- There is no open or short circuit.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 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
