Lexus IS250 · Service Manual BODY ELECTRICAL

01-DF

Diagnostic trouble codes

DESCRIPTION

DTC No.
 DTC Detection Condition
 Trouble Area
01-DF
*1
  1. The device with a display fails and the master is switched to the audio device.
  2. A communication error between sub-master (radio receiver) and master occurs.
  1. Multi-display power source circuit
  1. AVC-LAN circuit between the multi-display and the component which has stored this code
  1. AVC-LAN circuit between the multi-display and the radio receiver
  1. Multi-display
  1. Component which has stored this code

HINT:
*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:
  1. 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.
  2. The multi-display is the master unit.
  3. 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 (Click here).
If the power source circuit is operating normally, proceed to the next step.

NEXT


2. INSPECT RADIO RECEIVER

  1. E124056E02
    Disconnect the radio receiver connectors.

  1. 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

  1. E121199E04
    Enter the diagnostic mode.

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

  1. 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" (Click here).

  1. 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.

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

    2. 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.

      E124120E01



 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" (Click here).

  1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display and the radio receiver.

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

    2. 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.

      E111831E05



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6. REPLACE MULTI-DISPLAY

  1. 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


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