System Description

1. Components in the audio system communicate with each other through the Audio Visual Communication-Local Area Network (AVC-LAN).
   Fig 1: Audio System Communication Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. The receiver has a resistance of 60 to 80 Q, which is necessary for communication.
3. When a short circuit or circuit breakdown occurs in the AVC-LAN circuit, the audio system does not operate normally due to the communication cut off.

1. The audio system has a diagnosis function. The diagnosis result is displayed on the LCD of the radio receiver.
2. A component code (physical address), or 3 digit code (in hexadecimal), is set for each component of the AVC-LAN.
3. The logical address, or 2 digit code (in hexadecimal), is set for each function and component unit in each component of the AVC-LAN.

1. The Compact Disc (CD) player uses a laser beam pickup to read the digital signals recorded on CDs and reproduce analog signals of music, etc. The CD player can play 12 cm (4.7 in.) and 8 cm (3.2 in.) discs.
   NOTE: Never disassemble or apply oil to any part of the player unit.
   Only insert discs into the CD player.
   CAUTION: Do not look directly at the CD player's laser beam. Be sure to only operate the player as instructed.

1. RADIO RECEIVER ASSEMBLY (Physical address: 190) [AUDIO H/U]
   DIAGNOSTIC TROUBLE CODE CHART
   
   

   Terms	Description
   Physical address	Three-digit code (in hexadecimal) which is given to each component of AVC-LAN. Corresponding to function, individual symbols are specified.
   Logical address	Two-digit code (in hexadecimal) given to each function and component unit in each component of AVC-LAN.

   HINT:

   Titles for each unit below are stated in the following order: part name (physical address) [name indicated by DTC].

   1. Logical address: 01 (Communication control)

      HINT:

      Methods used to verify the cause of the problem are listed in order of probability in the verification column.

      DIAGNOSTIC TROUBLE CODE CHART
      
      

      DTC	Name	Diagnosis	Suspected Area	See
      D6*1	Absence of Master	With the ignition switch on ACC or ON, component in which this code is recorded was disconnected from system or master component.	Check power supply system harness of radio receiver Check communication system harness of radio receiver	Step 5
      D7*5	Connection Check Error	With the ignition switch on ACC or ON, component in which this code is recorded was disconnected from system or master component.	Check power supply system harness of radio receiver Check communication system harness of radio receiver	Step 5
      D8*2	No Response for Connection Check	After engine was started, component shown by sub code was disconnected from the system.	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	Step 5
      D9*1	Last Mode Error	With the ignition switch on ACC or ON, audio or visual component operated before engine stop is or was disconnected.	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	Step 5
      DA	No Response against ON / OFF Command	No response when changing mode (audio and visual mode change). Detected when sound and image do not change by switch operation.	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	Step 5
      DB*1	Mode Status Error	This code detects a dual alarm.	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	Step 5
      DC*3	Failure in Transmission	Transmission to component shown by sub code has failed. (Detecting this DTC does not necessarily mean actual failure).	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	Step 5
      DD*4	Master Reset (Momentary Interruption)	After engine was started, master component was been disconnected from system.	Check communication system harness of radio receiver If this error occurs frequently, replace radio receiver	-
      DE*4	Slave Reset (Momentary Interruption)	After engine was started, component shown by sub code was disconnected from system.	Inspection of the device indicated by the sub code (Refer to the for the device indicated by the sub code)	-
      DF*4	Master Error	Due to defective condition of component with a display, master function is changed to audio equipment. Error occurs in communication between sub-master (audio) and master component.	Check power supply system harness of radio receiver Check communication system harness of radio receiver	-
      E0*1	Registration Completion Instruction Error	Registration completion instruction command from master cannot be received.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.	-
      E2	ON / OFF Instruction Parameter Error	Error occurs in ON / OFF control command from master component.	Replace radio receiver	-
      E3*1	Registration Request Transmission	Registration request command is output from component shown by sub code. After receiving connection check instruction, registration request command is output from sub-master component.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.	-
      HINT: *1: This code may be recorded depending on the battery condition or engine start voltage even if no failure is detected. *2: If the power connector is disconnected after the engine starts, this code is recorded after 180 seconds. *3: This code may be stored when the ignition key is turned 1 minute after engine starts. *4: This code may be stored if the ignition key is turned again after the engine starts. *5: If the master component power supply connector is pulled out with the ignition switch on ACC or ON, this code is stored after 210 seconds.

   2. Logical address: 62 (CD): 63 (CD changer)

      HINT:

      Methods used to verify the cause of the problem are listed in order of probability in the verification column.

      DIAGNOSTIC TROUBLE CODE CHART
      
      

      DTC	Name	Diagnosis	Suspected Area
      42	Disc Cannot be Read	Disc cannot be read.	Inspect CD. If the same code is detected, replace the radio receiver
      44	CD Abnormal	Error is detected in CD player or CD changer (except for code 10).	After clearing the DTC, check the malfunction symptom. If the same code is detected, replace the radio receiver
      47	CD Temperature is High	High temperature is detected in CD player or CD changer.	With the ignition switch OFF, leave the vehicle in cool, shaded place until the radio receiver cools down. Then verify the malfunction symptom. If the same code is detected, replace the radio receiver
      48	Excess Current	Excess current is applied to the CD player or CD changer.	Replace radio receiver

   3. Logical address: 61 (Cassette)

      HINT:

      Methods used to verify the cause of the problem are listed in order of probability in the verification column.

      DIAGNOSTIC TROUBLE CODE CHART
      
      

      DTC	Name	Diagnosis	Suspected Area
      40	Mechanical Error of Media	Malfunction due to mechanical failure is identified or cassette tape is cut or entangled.	Inspect cassette tape Replace radio receiver

2. GATEWAY ECU (Physical address: 1C6) [G/W]
   1. Logical address: 01 (Communication control)

      HINT:

      Methods used to verify the cause of the problem are listed in order of probability in the verification column.

      DIAGNOSTIC TROUBLE CODE CHART
      
      

      DTC	Name	Diagnosis	Suspected Area
      D6*1	Absence of Master	With the ignition switch on ACC or ON, component in which this code is recorded was disconnected from system or master component. Or, radio receiver was disconnected when this code was recorded.	Check power supply system harness of radio receiver Check communication system harness of radio receiver Check power supply system harness of gateway ECU Check communication system harness of gateway ECU
      D7*4	Connection Check Error	After engine was started, component in which this code is recorded was disconnected from system or master component. Or, radio receiver was disconnected when this code was recorded.	Check power supply system harness of radio receiver Check communication system harness of radio receiver Check power supply system harness of gateway ECU Check communication system harness of gateway ECU
      DC*2	Transmission Error	Transmission to component shown by auxiliary code has failed. (Detecting this DTC does not necessarily mean actual failure)	If same auxiliary code is recorded in another component, check harness of power supply and communication system connected to all components shown by code.
      DD*3	Master Reset (Momentary Interruption)	After engine was started, radio receiver was disconnected from system.	Check power supply system harness of radio receiver Check communication system harness of radio receiver If this error occurs frequently, replace radio receiver
      DF*4	Master Error	Due to defective condition of component with a display, master function is switched to audio equipment. Error occurs in communication between sub-master (audio) and radio receiver.	Check power supply system harness of radio receiver Check communication system harness of radio receiver Check communication system harness between radio receiver and sub-master component
      E0*1	Registration Completion Instruction Error	Registration Completion Instruction command from master cannot be received.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.
      E3*1	Registration Request Transmission	Registration request command is output from slave component. After receiving connection check Instruction, registration request command is output from sub-master component.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.
      HINT: *1: This code may be stored depending on battery condition or engine start voltage even if no failure is detected. *2: This code may be stored if the ignition key is turned again 1 minute after engine starts. *3: This code may be stored if the ignition key is turned again after the engine starts. *4: If the master component power supply connector is pulled out with the ignition switch on ACC or ON, this code is stored after 210 seconds.

3. STEREO COMPONENT AMPLIFIER ASSEMBLY (Physical address: 440) [DSP AMP]
   1. Logical address: 01 (Communication control)

      HINT:

      Methods used to verify the cause of the problem are listed in order of probability in the verification column.

      DIAGNOSTIC TROUBLE CODE CHART
      
      

      DTC	Name	Diagnosis	Suspected Area
      D6*1	No Master	When either of the following conditions is met: The device that stores (stored) the code had) been disconnected when the ignition switch is on ACC or ON position The master device has (had) been disconnected when this code is stored	Power source circuit radio receiver) Power source circuit (stereo component amplifier) Although "power" is pressed, no sound is heard (display is normal, but switch operation does not function) Replace radio receiver Replace stereo component amplifier
      D7	Connection Check Error	When either of the following conditions is met: The device that stored this code has (had) been disconnected after the engine starts (started) The master device has (had) been disconnected when this code is (was) stored	Power source circuit radio receiver) Power source circuit (stereo component amplifier) Although "power" is pressed, no sound is heard (display is normal, but switch operation does not function) Replace radio receiver Replace stereo component amplifier
      DC*2	Transmission Error	Transmission to component shown by sub code has been failed.	Inspection for the device indicated by the sub code. (Refer to the for the device indicated by the sub code.)
      DD*3	Master Reset	When the device that should be the master has been disconnected after engine starts	Power source circuit (radio receiver) Although "power" is pressed, no sound is heard (display is normal, but switch operation does not function) Replace radio receiver
      DF*4	Master Error	The device with a display failed and the master has been switched to the audio device, or a communication error between sub master (audio) and master occurred.	Power source circuit (radio receiver) Although "power" is pressed, no sound is heard (display is normal, but switch operation does not function) Replace radio receiver
      E0*1	Registration Complete Indication Error	Registration complete command from the master device cannot be received.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.
      E1*1	Voice Processing Device ON Error	AMP device records that the AMP output does not function even while the source device operates.	Power source circuit radio receiver) Although" power" is pressed, no sound is heard (display is normal, but switch operation does not function) Replace radio receive
      E2	ON / OFF Indication Parameter Error	Command for ON / OFF control from the master device has a problem.	Replace radio receiver
      E3*1	Registration Demand Transmission	When the registration request command from the slave device is output, or when the registration request command is output by receiving connection confirmation command from the sub master device.	Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists.
      HINT: *1: This code may be stored depending on battery condition or engine start voltage even if no failure is detected. *2: This code may be stored if the ignition key is turned again 1 minute after engine starts. *3: This code may be stored if the ignition key is turned again after the engine starts. *4: If the master component power supply connector is pulled out with the ignition switch on ACC or ON, this code is stored after 210 seconds.

HINT:

Methods used to verify the cause of the problem are listed in order of probability in the verification column.