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DTC 01-D6 No Master: DTC 01-D7 Connection Check Error: Description

DTC TROUBLE DETECTION

DTC No. DTC Detection Condition Trouble Area
01-D6 *1 When either of the following conditions is met:
  • The device that stores (stored) the code has (had) been disconnected when the ignition switch is in the ACC or ON position
  • The master device has (had) been disconnected when this code is stored
  • Radio receiver power source circuit
  • Power source circuit of the component which has stored this code
  • AVC-LAN circuit between the radio receiver and the component which has stored this code
  • Component which has stored this code
  • Radio receiver
01-D7 *2 When either of the following conditions is met:
  • The device that stored the code has (had) been disconnected after the engine starts (started)
  • The master device has (had) been disconnected when this code is (was) stored
HINT:
  • *1: Even if no failure is detected, a trouble code may be recorded depending on the battery condition or engine start voltage.
  • *2: 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 the RADIO RECEIVER POWER SOURCE CIRCUIT  .

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

  2. IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE 
    1. Enter the diagnostic mode.
      Fig 1: Service Check Mode Flow Chart
      G04092573Courtesy 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 

    COMPONENT TABLE

    Component Physical address
    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 the "DTC CHECK/CLEAR " .
  3. CHECK POWER SOURCE CIRCUIT OF THE COMPONENT WHICH HAS STORED THIS CODE 
    1. Inspect the power source circuit of the component which has stored this code.

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

    Component Table 

    COMPONENT REFERENCE TABLE

    Component Proceed to
    Stereo Component Amplifier STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT 
    Multi-display Controller MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT 
  4. 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 2: Identifying Radio Receiver Connector Terminals
    G04092574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RADIO RECEIVER 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT WHICH HAS STORED THIS CODE) 

    HINT:

    For details of the connectors, refer to the "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
    G04092575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. REPLACE COMPONENT WHICH HAS STORED THIS CODE 
    1. Replace the component which has stored this code with a normal one and check if the same problem occurs again.

      OK: Same problem does not occur. 

    NG: REPLACE RADIO RECEIVER 

    OK: END 

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