Kia Optima: Weight Classification System (WCS) Repair procedures - SRSCM - RestraintKia Optima: Weight Classification System (WCS) Repair procedures

Disconnect the battery negative cable, and wait for at least three minutes before beginning work.
Remove the front passenger seat assembly.
(Refer to the Body group - "Seat")
Remove the OCS assembly.
(Refer to the Body group - "Seat")
There are several case about DTC, please check below status
B1344 WCS ECU Defect
B1319 Required Weight Check
B1644 CAN Timeout-ACU
B1323 Sensor Defect

Case A. Remove only ECU. After replacing, perform WCS reset and DTC clear.
Case B. Perform WCS Reset and Accuracy check, if accuracy check result is accepted and DTC is historic, WCS can be re-used.
Case C or Case D. Check vehicle wiring, connectors and normal conditions. If No DTC after WCS reset and DTC Clear, WCS can be re-used.
WCS(Weight Classification System) is utilizing a robust weight measuring technology. Thus, if any of the following conditions occur, WCS reset and accuracy check should be performed.
The WCS 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.
Install the WCS in the front passenger seat assembly.
(Refer to the Body group - "Seat")
Install the WCS ECU if only the WCS ECU was removed.
Install the front passenger seat assembly.
(Refer to the Body group - "Seat")
Reconnect the battery negative cable.
After installing WCS, perform the WCS reset and accuracy check with the GDS.
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.
Adjust the seat position according to the table below.
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.
Connect the GDS connector to the data link connector located under the crash pad.
Turn the ignition switch on and power on the GDS.
Perform the WCS reset by using the GDS.
[System selection screen]
Vehicle Selection_Airbag_Weight Classification System _WCS RESET_ENTER
(then, Completed is displayed)
Perform the accuracy check by using the GDS.
[System selection screen]
Vehicle Selection_Airbag_Weight Classification System_WCS RESET_ESC
Confirm the measured weight is within the standard value. And then press "ESC".

specification : -6kg ~ 6kg (-13.23lb ~ 13.23lb)

Place a 37kg (81.57lb) weight on the passenger front seat.
Confirm that the result of accuracy check is within the standard value.

specification : 31kg ~ 43kg (68.34lb ~ 94.79lb)

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 front passenger seat assembly.
If the WCS reset operation not completed normally, replace the front passenger seat assembly.
After installing the WCS, 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 WCS does not require suppression and the passenger airbag is enabled.
Weight Classification System (WCS) Components and Components Location
Components ...

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