Hyundai Elantra HD: Occupant Classification Sensor (OCS). Repair procedures

Removal

1.	Disconnect the battery negative cable, and wait for at least three minutes before beginning work.

2.	Remove the front passenger seat assembly. (Refer to BD group)

3.	Remove the seat leg as an assembly. (Refer to BD group)

Installation

OCS is utilizing a robust weight measuring technology. Thus, if any of the following conditions occur, WCS reset and accuracy check should be performed. • The occupant classification ECU or any of the sensors is replaced. • The vehicle is brought to the repair shop due to an accident or a crash even though the severity seems to be minor. • The telltale lamp is not illuminated when the passenger seat is not occupied. • The telltale lamp is delayed more than 10 seconds to be turned off when an adult passenger seats in. • The passenger seat is removed from the vehicle and reassembled. • Any accessories (side table, seatback table and seat cover, etc) are replaced or installed.

1.	Install the OCS equipped seat leg assembly. (Refer to BD group)

2.	Install the front passenger seat assembly. (Refer to BD group)

3.	Reconnect the battery negative cable.

4.

After installing OCS, perform the WCS reset and accuracy check with the Hi-Scan Pro. Check that seat is not occupied and empty before performing the operation. Make sure that the back pocket is empty. In order to perform the accuracy check, the command zero operation should be finished normally. Make sure the procedure be finished normally. (1) Adjust the seat position according to the table below. Item Remark Seat track position Rearmost position Seat recliner angle Normal (upright) Head rest position Lowest position Lifter position Lowest position Make sure seat belt not to be buckled, and the belt tension be normal. (2) Connect the Hi-Scan Pro connector to the data link connector located under the crash pad. (3) Turn the ignition switch on and power on the Hi-Scan Pro. (4) Perform the WCS reset by using the Hi-Scan Pro. [System selection screen] Vehicle Selection_Airbag_02.Weight Classification System_04. WCS RESET_ENTER (then, Completed is displayed) (5) Perform the accuracy check by using the Hi-Scan Pro. [System selection screen] Vehicle Selection_Airbag_02.Weight Classification System_04. WCS RESET_ESC (6) Confirm the measured weight is within the standard value. And then press "ESC". specification : -2.0kg ~ 2.0kg (-4.4lb ~ 4.4lb) (7) Place a 37kg (81.57lb) weight on the passenger front seat. (8) Confirm that the result of accuracy check is within the standard value. specification : 35kg ~ 39kg (77.16lb ~ 85.98lb) • When performing the accuracy check, use a solid metal weight and place it at the center of the seat. If the weight made from liquid is used or the weight slides, the check result may not accurate, and could result in unwanted fail • When the measured weight deviates from the standard value, check again all the fastening bolts are tightened properly. And make sure there is no interference. During the tightening, be careful not to deform the seat rail or seat structure. If the accuracy check is still not inside the standard value, replace the seat leg assembly. • When WCS reset operation not finished normally, replace the seat leg assembly.

5.

After installing the OCS, confirm proper system operation : Turn the ignition switch ON, the SRS indicator should be turned on for about six seconds and then go off. Telltale lamp will turn on for 4 seconds and be turned off for 3 seconds. After the 7 seconds, it shall remain off if the OCS does not require suppression and the passenger airbag is enabled.

Occupant Classification Sensor (OCS). Components and Components Location

Components ...

Airbag Module

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