Occupant Classification System: Registration

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

REGISTRATION
NOTE:
- After the power switch is turned OFF, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch OFF, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
- If any DTCs related to the occupant classification ECU are output, troubleshoot those DTCs by referring to the DIAGNOSTIC TROUBLE CODE CHART .
- When ECU data saving or loading operations cannot be performed, replace the front seat set (with occupant classification ECU and occupant detection sensor).
HINT:
- When the front seat set (occupant classification ECU) is replaced, the previous ECU data must be saved in the intelligent tester or Techstream and loaded into the new ECU by following the flowchart below.
- Until the data from the previous ECU are loaded into the new occupant classification ECU, these data are not erased even when the tester is turned off.
- ECU EXCHANGE procedure (Before Exchange) describes the procedure to save the data in the intelligent tester or Techstream from the occupant classification ECU which was installed on the vehicle. ECU EXCHANGE procedure (After Exchange) describes the procedure to load the data from the previous ECU, stored in the intelligent tester or Techstream, into the new ECU.
1. Connect the intelligent tester or Techstream to the DLC3.
2. Turn the power switch ON (IG).
3. Store the occupant classification ECU data in the intelligent tester or Techstream by following the prompts on the tester screen.
  HINT:
  
  If the ECU data cannot be stored in the intelligent tester or Techstream, replace the front seat set (with occupant classification ECU and occupant detection sensor).
4. Turn the power switch ON (IG).
5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
6. Replace the front seat set (occupant classification ECU) (see DISASSEMBLY ).
7. Connect the negative (-) terminal cable to the battery.
8. Turn the power switch ON (IG).
9. Load the data from the previous ECU stored in the tester into the newly installed ECU by following the prompts on the tester screen.
10. Turn the power switch OFF.
11. Turn the power switch ON (IG).
12. Clear the DTCs stored in the memory (see DIAGNOSIS SYSTEM ).
  HINT:
  
  If DTCs are not cleared at this time, past DTCs will remain