Occupant Classification Ecu: Replacement

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

PRECAUTION (SEE SUPPLEMENTAL RESTRAINT SYSTEM )
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
Wait for 90 seconds after disconnecting the cable to prevent the airbag working.
REMOVE FRONT RH SEAT ASSY (SEE OVERHAUL (MANUAL SEAT) OR OVERHAUL (POWER SEAT))
REMOVE WIRING HARNESS CONNECTOR (POWER SEAT) (SEE OVERHAUL )
REMOVE OCCUPANT CLASSIFICATION ECU
1. Disconnect the 2 connectors from the occupant classification ECU.
2. Using a screwdriver, remove the occupant classification ECU.
Fig 1: Removing Occupant Classification ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSTALL OCCUPANT CLASSIFICATION ECU
1. Check that the ignition switch is off.
2. Check that the battery negative (-) terminal is disconnected.
  CAUTION: After removing the terminal, wait for at least 90 seconds before starting the operation.
3. Install the occupant classification ECU.
4. Connect the 2 connectors to the occupant classification ECU.
NOTE:
- If the occupant classification ECU has been dropped, or there are cracks, dents or other defects in the case or connector, replace it with a new one.
- When installing the occupant classification ECU, be careful that the SRS wiring does not interfere with other parts and that it is not pinched between other parts.
INSTALL WIRING HARNESS CONNECTOR (POWER SEAT) (SEE OVERHAUL )
INSTALL FRONT RH SEAT ASSY (SEE OVERHAUL (MANUAL SEAT) OR OVERHAUL (POWER SEAT))
CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
INSPECT SRS WARNING LIGHT (SEE DIAGNOSIS SYSTEM )