Section 265 (Audio System - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSIS CHECK
1. Starting Diagnosis Mode (Service Check Mode)
  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:
    - Beep sound is given 3 times and the system enters the service check mode.
    - It may take about 40 sec. to complete the check.
    - 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 component codes (physical address.)
  Fig 1: Terms Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Code No (Physical Address) Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Code No. (Physical Address) List
  
  Fig 3: Locating Reset 1, Preset And DISC Switches
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Finishing Diagnosis Mode
  1. Press "DISC" for 2 sec. or more, or turn the IG switch OFF.
3. Service Check Mode Result Display (for checking the current and the past system conditions)
  1. Press the "TUNE" switch to see the check result of each device.
    
    Fig 4: Service Check Mode Result Display Flow Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check Result Display
    
    Fig 5: Result Display Table (1 Of 2)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 6: Result Display Table (2 Of 2)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. To perform the Service Check again, press the preset switch "1".
4. Detail information Mode (when displaying the troubled device's DTC)
  1. With "CHEC" or "ECHn" being display, press the preset switch "2"" to go to the detail information mode.
  2. Press the "TUNE" switch to display "System Check Result (SYS)" and "Diagnosis Memory Response (CODE)".
    
    Fig 7: Service Check Mode - Detail Information Mode Display Flow Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Displayed Items in Detail Information Mode
    
    Fig 8: Detail Information Mode Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check the trouble area referring to the DTC list.
  5. To return to the service check mode, press the preset switch "3".
5. Clearing Individual DTC Memory (when clearing the memory of DTC detected in the past individually)
  1. Press the preset switch "5" for 2 sec. or more while the "ECHn" is displayed in the service check mode or during the detail information mode.
  HINT:
  - Beep sound is given 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.
6. Clearance of all DTC memory (when clearing all the memory of DTC detected in the past)
  1. Start the diagnosis mode after repairing the trouble area.
  2. Press the preset switch "5" for 2 sec. or more. ("CLr" is displayed at this time.)
    HINT:
    - Beep sound is given once when the DTC memory is completely cleared.
    - When DTC memory for all the device is cleared, only the component codes (physical address) are displayed.
  3. Press the preset switch "1" to perform the service check again, and check that no DTC is displayed for all the component codes (physical address).
IDENTIFICATION OF NOISE SOURCE
1. Identify the condition under which the noise occurs and check the noise filter on the related part.
  
  Fig 9: Noise Source Troubleshooting Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reference:
  - Make sure first that there is no noise from outside. Failing to do so makes the noise source detection difficult and leads to misunderstanding.
  - The noise should be removed in descending order of loudness.
  - Setting the radio untuned makes noise noticeable, making the recognition of the phenomenon easier.
CHECK STEERING PAD SWITCH USING HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
  1. Check the steering pad switch using DATA LIST.
  Standard:
  
  Audio control switch
  
  Fig 10: Audio Control Switch Operation Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Cellular mobile telephone control switch
  
  Fig 11: Cellular Mobile Telephone Control Switch Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002