Occupant Classification ECU

Occupant Classification ECU:

REPLACEMENT

1. REFER TO SERVICE PRECAUTIONS
2. DISCONNECT BATTERY NEGATIVE TERMINAL
3. REMOVE FRONT RH SEAT ASSY




4. REMOVE OCCUPANT CLASSIFICATION ECU
a. Disconnect the connectors from the occupant classification ECU.
b. Using a screwdriver, remove the occupant classification ECU.

5. INSTALL OCCUPANT CLASSIFICATION ECU
a. Check that the ignition switch is off.
b. Check that the battery negative (-) terminal is disconnected.

CAUTION: After removing the terminal, wait for at least 90 seconds before starting the operation.

c. Install the occupant classification ECU.
d. Connect the 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, bracket 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.

6. INSTALL FRONT RH SEAT ASSY

7. CONNECT BATTERY NEGATIVE TERMINAL






NOTE: When disconnecting the negative (-) battery terminal, initialize the systems shown in the table after the terminal is reconnected.




8. OCCUPANT CLASSIFICATION ECU INITIALIZATION

CAUTION: In the case of removing the front seat assy, perform the zero point calibration and sensitivity check of the occupant classification ECU after the front seat assy is installed.

HINT: Perform the zero point calibration or sensitivity check if any of the following conditions occur:
- The occupant classification ECU is replaced.
- Accessories (seatback tray or seat cover, etc.) are installed.
- The passenger seat is removed from the vehicle.
- Both the SRS warning light and passenger occupant classification indicator ("OFF") come on.
- The vehicle is brought to the workshop for repair due to an accident or collision.




a. Zero point calibration procedure.
1. Adjust the seat position according to the conditions below.
2. Connect the hand-held tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Perform the zero point calibration by following the prompts on the tester screen.

HINT: Refer to the hand-held tester operator's manual for further details.

b. Sensitivity check procedure.
1. Connect the hand-held tester to the DLC3.
2. Apply a 30 kg (66.14 lb) weight (eg. a 30 kg (66.14 lb) of lead mass) onto the passenger seat.
3. Turn the ignition switch to the ON position.
4. Using the hand-held tester, perform the sensitivity check, and confirm that the sensitivity is within the standard value.

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

HINT:
- When proceeding the sensitivity check, use a solid weight made from metal (the check result may not appear properly if the weight made from liquid is used).
- When the sensitivity deviates from the standard value, re-tighten the bolts of the passenger seat taking care not to deform the seat rail. After performing this procedure, if the sensitivity does not stay within the standard value, replace the front RH seat assy.

NOTE: Do not place any objects on the seat (perform the initialization by attaching a mass heavier than 2 kg (4.41 lb) in the seatback pocket, seatback table installed by the use, etc.).

9. INSPECT SRS WARNING LIGHT