LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> IS 350 >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Audio / Visual >> Audio And Visual System >> DTC 01-DD Master Reset: DTC 01-E1 Voice Processing Device ON Error >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC 01-DD Master Reset: DTC 01-E1 Voice Processing Device ON Error: Description

DTC DETECTION CONDITION

DTC No. DTC Detection Condition Trouble Area
01-DD The device that should be the master has been disconnected after engine start
  • 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
01-E1
*1		 The AMP device records that the AMP output does not function even while the source device operates
HINT:

*1: Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.
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. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    ATX+ - ATX- Always 60 to 80 Ω
    TXM+ - TXM- Always 60 to 80 Ω
    TX+ - TX- Always 60 to 80 Ω
    Fig 1: Identifying Radio Receiver Connectors And Terminals
    G04050100Courtesy 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 Communication Diagram - Detailed Information Mode
      G04050101Courtesy 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
      Gateway ECU 1C6
      Stereo component amplifier 440
      Integration control & panel assembly 1D8

      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 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. Disconnect all connectors between the radio receiver and the component which has stored this code.
      2. 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
    G04050102Courtesy 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 

scientia non olet · About LEMON Manuals