*1: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the engine switch on (ACC or IG), this code is stored.

NOTICE:

Before starting troubleshooting, be sure to clear DTCs to erase codes stored due to the reasons described in the HINT above. Then, check for DTCs and troubleshoot according to the output DTCs.

The multi-display is the master unit.

Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

INSPECTION PROCEDURE

NOTICE:

Be sure to read DESCRIPTION before performing the following procedures.

1.CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT

Refer to the multi-display power source circuit .

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

NEXT

2.INSPECT RADIO RECEIVER

Dtc 01-Df Master 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 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

NG

REPLACE RADIO RECEIVER

OK

3.IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE

Enter the diagnostic mode.

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

Identify the component which has stored this code.

Component Table:
Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
G/W	Gateway ECU
NAVI	Navigation ECU
CAMERA-C	Television camera ECU

HINT:

"NAVI" is the component which has stored this code in the example shown in the illustration.

NEXT

4.CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMPONENT WHICH HAS STORED THIS CODE)

HINT:

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 multi-display and the component which has stored this code.

Disconnect all connectors between the multi-display and the component which has stored this code.

Check for an open or short in the AVC-LAN circuit between the multi-display and the component which has stored this code.

OK:
There is no open or short circuit.

Dtc 01-Df Master Error. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - RADIO RECEIVER)

HINT:

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 multi-display and the radio receiver.

Disconnect all connectors between the multi-display and the radio receiver.

Check for an open or short in the AVC-LAN circuit between the multi-display and the radio receiver.

OK:
There is no open or short circuit.

Dtc 01-Df Master Error. NAVIGATION. Lexus IS250 IS220d GSE20 ALE20

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.REPLACE MULTI-DISPLAY

Replace the multi-display with a normal one and check if the same problem occurs again.

OK:
Same problem does not occur.

NG

REPLACE COMPONENT WHICH HAS STORED THIS CODE

OK

END

LEXUS IS250, IS220d / GSE20 ALE20

NAVIGATION

Lexus IS250 IS220d GSE20 ALE20

NAVIGATION SYSTEM

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