Audio System: Troubleshooting

DIAGNOSIS FUNCTION 

1. Diagnosis start-up

   For shifting diagnosis mode, turn ignition switch ON and push the "DISC" switch 3 times while pressing "ch1" and "ch6" switches.

   HINT:

   To exist from the diagnosis mode, push the "DISC" switch for 1.7 sec. or turn ignition switch to ACC or OFF.

   Fig 1: Identifying Switches

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2. Service check mode
   1. After the diagnosis start-up, the system enters service check mode.
   2. Error codes over tuner and connected equipment are displayed on the screen of tuner. Results for each check are displayed as follows:
      • good:

        No DTC is detected for both "System Check Confirmation" and "Diagnosis Memory Response".

      • nCon:

        The Component does not respond to the "Diagnosis On Instruction" command.

        Applicable to only the system where connected components are limited to be used.

      • ECHn:

        Application of new version has been confirmed by the "Diagnosis On Check", and there is one or more DTC which indicates "Replacement" in the "System Check Result Response" or "Diagnosis Memory Response".

      • CHEC:

        Application of new version has been confirmed by the "Diagnosis On Check", and there is no DTC which indicates "Replacement" in the "System Check Result Response" or "Diagnosis Memory Response", but one or more DTC which indicated "Check" is identified.

      • Old:

        Application of old version is confirmed by the "Diagnosis On Check", and DTC is identified in the "System Check Result Response" or "Diagnosis Memory Response".

      • nrES:

        No response is identified to the "System Check Start Instruction" and "Request for System Check Result" commands.

   HINT:

   • Check the present and past condition of components by performing the System Check and collecting stored DTC memories.
   • Check results shall be displayed as one of six following indications: "good", "ECHn", "CHEC'V'nCon", "Old" or "nrES".
3. Display Screen for Service Check.

   Example: 

   Connection parts ( physical address): Radio receiver (P190), CD Auto Changer (P240), MD changer (P3A0)

   Fig 2: Display Screen For Service Check

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4. "ECHn" Detail Display Mode Screen
   Fig 3: "ECHn" Detail Display Mode Screen

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5. "CHEC" Detail Display Mode Screen
   Fig 4: "CHEC" Detail Display Mode Screen

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6. "Old" Detail Display Mode Screen

Fig 5: "Old" Detail Display Mode Screen

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DIAGNOSIS FUNCTION 

Error codes over tuner and connected equipment are displayed on the screen of tuner.

1. Diagnosis start-up

   For shifting to diagnosis mode, push "DISC" switch 3 times with pressing "1" and "6" of PRESET switch at the same time while the audio power is OFF and ACC is ON.

   To exit from diagnosis mode, press "DISC" switch for 2 seconds or turn the ignition key OFF. (When "1-190" is displayed, the mode is transferred to LAN check mode.)

2. LAN check

   When starting up the diagnosis mode, the mode turns to LAN check mode, the screen displays the code numbers (physical address) of tuner and connected equipment. Smaller codes are displayed in order, displayed code numbers are switched by operating TUNE "UP" or "DOWN" switch. In LAN check mode, by pressing "5" of PRESET switch for more than 2 secs., diagnosis memory of each equipment can be deleted, when deletion is completed, the mode returns to LAN check mode.

   Fig 6: Identifying Switches

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Code No. (physical address) List 

   CODE NO. (PHYSICAL ADDRESS) LIST IDENTIFICATION
   
   

   Code No. (physical address)	Equipment name
   190	Radio receiver assembly (Audio head unit)
   240	CD changer (in Luggage room)
   360	CD changer (in center console and glove compartment box)
   440	Power amplifier

3. System check
   • When pressing "1" of PRESET switch in LAN check mode, the mode turns to the system check mode, the system performs self diagnosis of connected equipment and displays the results ("SYS" (showing the system is under detection) is displayed.)
   • Perform the operation shown in Fig 7 , then read the result of the inspection.

   HINT:

   • It sometimes takes approx. 40 secs, till the system inspection is completed.
   • An example of when diagnosis code "21" appears on the physical address (190) equipment. (ROM error occurs on the radio receiver.) is shown in Fig 7
   • The smaller code numbers (physical address) are displayed in order (code No., diagnosis code, support code of diagnosis code (object equipment)).
   • When no error is detected in the system, "00" is displayed.
   • When an error code is detected, up to 6 codes per one system are displayed. Pressing TUNE "UP" or "DOWN" switches the display.
   • In the system check mode, when pressing "6" of PRESET switch the mode returns to LAN check mode.
   Fig 7: Diagnostic Chart (1 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Diagnosis memory
   1. In LAN check mode, when pressing "2" of PRESET switch the mode turns to the diagnosis memory mode. ("CODE" is displayed.)

      The results of self diagnosis performed over tuner and connected equipment are memorized and displayed.

   2. Perform the operation shown in Fig 8 , then read the result of the inspection.

   HINT:

   • The smaller code numbers (physical address) are displayed in order (code No., periodic communication number when error occurs, diagnosis code, and support code of diagnosis code (object equipment)).
   • When no error is detected in the system, "00" is displayed. When an error code is detected, up to 6 codes per one system are displayed. Pressing TUNE "UP" or "DOWN" switches the display. Each diagnosis code is same as code in the system check mode.
   • When pressing "6" of PRESET switch, the mode returns to LAN check mode.
   • An example of when diagnosis code "D1" appears on the code (190) and (240 or 360) equipment. (Communication error occurs between the radio receiver and CD changer.) is shown in Fig 8
   Fig 8: Diagnostic Chart (2 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Diagnosis memory clear
   1. After error is fixed, start up the diagnosis mode.
   2. Continue pressing preset switch "5" for 2 secs. (CLr is displayed.)
   3. Press the preset switch "2" and transfer to the diagnosis memory mode and check that the normal code (00) is output.

DIAGNOSIS CODE LIST 

1. Physical address 190: Radio receiver assembly

   HINT:

   • *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
   • *2: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
   • *3: It may be stored when the engine key is turned 1 min. again after engine start.
   • *4: It may be stored when the engine key is turned again after engine start.
   • *5: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition switch in ACC or ON, this code is stored.
   1. Logical address: 01 (Communication control)
      Fig 9: Diagnosis Code List

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   2. Logical address: 61 (Cassette switch)
   Fig 10: Diagnostic Chart

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2. Physical address: 440 Stereo component amplifier

   HINT:

   • *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
   • *2: It may be stored when the engine key is turned 1 min. again after engine start.
   • *3: It may be stored when the engine key is turned again after engine start.
   • *4: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition switch in ACC or ON, this code is stored.

   Logical address: 01 (Communication control)

   Fig 11: Diagnostic Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Physical address: 240 CD Auto Changer

   HINT:

   • *1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
   • *2: It may be stored when the engine key is turned 1 min. again after engine start.
   • *3: It may be stored when the engine key is turned again after engine start.
   • *4: It may be stored when the engine key is turned again after engine start.
   • *5: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition switch in ACC or ON, this code is stored.
   1. Logical address: 01 (Communication control)
      Fig 12: Diagnostic Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Logical address: 63 (CD Auto Changer)
   LOGICAL ADDRESS: 63 (CD AUTO CHANGER)
   
   

   DTC	Diagnosis item	Diagnosis content	Countermeasure and inspected parts
   60	CD Error	Error is detected in CD auto changer.	Replace CD auto changer
   61	EJECT Error	Magazine cannot be ejected.	Replace CD auto changer
   62	No Disc Readout	Disc cannot be read.	Inspect CD
   63	CD Auto Changer Temp. Too High	Readout cannot be done because temperature around player's pick-up (reading part) is too high.	With IG switch OFF, leave vehicle in cool shaded place for a while and re-check. After deleting the DTC memory, if same code detected, replace CD auto changer.
   64	CD Changer Excess Current	Excess current is applied CD auto changer.	Replace CD auto changer

DIAGNOSIS CODE LIST 

• If there is "O" in the column of system check, an error can be detected when the mode is switched to the system check mode.
• If there is "O" in the column of diagnosis mode, each unit is monitoring whether or not it has failure. In case of detecting failure, it memorizes DTC.

Fig 13: Diagnosis Code List (1 Of 2)

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Fig 14: Diagnosis Code List (2 Of 2)

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HINT:

This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during system operation and was prepared on the assumption of system component troubles (except for the wires and connectors, etc.).

Always inspect the trouble taking the following items into consideration.

• Open or short circuit of the wire harness
• Connector or terminal connection fault

The term "AM" includes LW, MW and SW, and the term "FW" includes UKW.