Audio System - Diagnostics: Pre-Check

1. Turn off the audio system and turn the IG switch to ACC. While pressing the preset switches "1" and "6" at the same time, press "DISC" 3 times.
2. Reference:

Fig 1: Locating Audio System Diagnosis Mode

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• A beep sound is emitted 3 times and the system enters SW check mode and all elements come on.
• It may take about 40 sec. to complete the check.
• Turn all the elements in the LCD on.
• When pressing the switch, confirm a beep sound is emitted.
• Press the "SEEK TRACK" switch to enter the "Service Check Screen".

1. Reference

• In the service check mode, the system check and the diagnosis memory check are performed, and the check results are displayed in ascending order of the device codes (physical address.)

Code No. (physical address) List 

1. Press "DISC" for 2 sec. or more, or turn the IG switch OFF.

1. Press the "SEEK TRACK" switch to see the check result of each device.
   Fig 2: Checking Mode Result Display

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check Result Display.
   CHECK RESULT DISPLAY DESCRIPTION
   
   

   Display	Original Language	Meaning	Action to be taken
   good	Good (normal)	No DTC is detected in both "System Check Mode" and "Diagnosis Memory Mode".	-
   nCon	No connection	The system recognized the component when it was registered, but the component gives no response to the "Diagnosis Mode ON Request".	Check the power source circuit and the communication circuit of the device indicated by the device code (physical address).
   ECHn	Exchange	One or more DTCs for "Exchange" are detected in either "System Check Mode" or "Diagnosis Memory Mode".	Go to the detailed information mode to check the trouble area referring to the DTC list.
   CHEC	Check	When no DTC is detected for "Exchange", one or more DTCs for "Check" are detected in either "System Check Mode" or "Diagnosis Memory Mode".	Go to the detailed information mode to check the trouble area referring to the DTC list.
   Display	Original Language	Meaning	Action to be taken
   Old	Old version	Old DTC application is identified and DTC is detected in either "System Check Mode" or "Diagnosis Memory Mode".	-
   nrES	No response	The device gives no response to any one of "System Check Mode ON Request", "System Check Result Request" and "Diagnosis Memory Request".	Check the power source circuit and the communication circuit of the device indicated by the device code (physical code).

3. To perform the service check again, press the preset switch "1".

1. With "CHEC" or "ECHn" being displayed, press the preset switch "2" to go to the detailed information mode.
2. Press the "SEEK TRACK" switch to display "System Check Result (SyS)" and "Diagnosis Memory Response (COdE)".
   Fig 3: Service Check Mode Information Mode Description

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Displayed Items in Detailed Information Mode
   DTC DISPLAY MEANING DESCRIPTION
   
   

   Division Code for DTC display	Meaning	Order of detailed information displayed when the "TUNE UP" switch is pressed. (The order is reversed when the "TUNE DOWN" switch is pressed.)
   SyS	System check result is displayed.	Logical address --> DTC
   COdE	Diagnosis memory check result is displayed.	Logical address --> DTC --> Sub code --> Connection confirmation number --> The number of times of occurrence

4. Check the trouble area referring to the DTC list.
5. To return to the service check mode, press the preset switch "3".

1. Press the preset switch "5" for 2 sec. or more while the "ECHn" is displayed in the service check mode or during the detailed information mode.

HINT:

• A beep sound is emitted once when the DTC memory is completely cleared.
• When DTC memory is cleared, only the component code (physical address) is displayed for the target component.
• To check DTC, press the preset switch "1" and perform the service check again.