Service Check Mode (DTC Check)

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

HINT:

Contrasting may differ from the actual vehicle depending on the device settings and options. Therefore, some detailed areas may not be shown exactly the same as on the actual vehicle.

Start the diagnostic mode (see DIAGNOSTIC START-UP/FINISH ).
Read the system check result.
1. If all check results of other devices are "EXCH," "CHEK" or "Old," touch the display to check the contents on the "Unit Check Mode" screen and record them on the customer problem analysis check sheet.
HINT:
- If all check results are "OK," go to communication DTC check (go to step 3).
- If a device name is not known, its physical address is displayed.
  
  Fig 1: Displaying Unit Check Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Displaying System Check Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

If "EXCH", "CHEK" and "Old" as well as "OK" exist, press the service switch to return to the "System Check Mode". Then, check the "Unit Check Mode" screen and record them on the customer problem analysis check sheet.
Read the communication diagnostic check result.
1. Return to the "System Check Mode", and press "LAN Mon" switch to enter the LAN monitor screen.
  
  Fig 3: Displaying System Check Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Displaying LAN Monitor Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If the result is "CHEK" or "Old," touch the result switch to check the contents on the individual communication diagnostic screen and record them on the customer problem analysis check sheet.
HINT:
- If all check results are "No Err," the system judges that no DTC exists.
- The sub-code (relevant device) will be indicated by its physical address.
Fig 5: Identifying LAN Monitor Mode
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If check results of other devices are "CHEK," press the "Service" switch to return to the original "LAN Monitor" screen. Then, check the individual communication diagnostic screen for the next device and record the result on the customer problem analysis check sheet.