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DTC 01-DF Master Error: Description

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTION CONDITION AND TROUBLE AREA

DTC No. DTC Detection Condition Trouble Area
01-DF *1 The device with a display fails and the master is switched to the audio device
Also when a communication error between sub-master (audio) and master occurs, this code is stored
  • Radio receiver power source circuit
  • AVC-LAN circuit between the radio receiver and the component which has stored this code
  • Radio receiver
  • 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 ignition switch in the ACC or ON position, this code is stored.
NOTE:
  • 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 radio receiver is the master unit.
  • Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.
NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK RADIO RECEIVER POWER SOURCE CIRCUIT 

    Refer to RADIO RECEIVER POWER SOURCE CIRCUIT  .

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

  2. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      ATX+(R2-5) - ATX-(R2-15) Always 60 to 80 Ω
      TX+(R3-9) - TX-(R3-10) Always 60 to 80 Ω
      TX+(R4-9) - TX-(R4-10) Always 60 to 80 Ω
      Fig 1: Identifying Radio Receiver Connector Terminals
      G04115437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RADIO RECEIVER 

    OK: Go to next step. 

  3. IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE 
    1. Enter the diagnostic mode.
      Fig 2: Service Check Mode Flow Chart
      G04115438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch '3" to change to "Detailed Information Mode".
    3. Identify the component which has stored this code.

      Component Table 

      COMPONENTS PHYSICAL ADDRESS

      Component Physical address
      Gateway ECU 1C6
      Stereo Component Amplifier 440
      Multi-display Controller 1F6

      HINT:

      • "440 (stereo component amplifier)" is the component which has stored this code in the example shown in the illustration.
      • For details of the DTC display, refer to DTC CHECK / CLEAR  .
  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT WHICH HAS STORED THIS CODE) 

    HINT:

    For details of the connectors, refer to TERMINALS OF ECU  .

    1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the radio receiver and the component which has stored this code.
      1. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component which has stored this code.

        OK: There is no open or short circuit. 

        Fig 3: AVC-LAN Wiring Diagram
        G04115439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  5. REPLACE RADIO RECEIVER 
    1. Replace the radio receiver 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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