Hyundai Elantra: SRSCM / Occupant Classification System (OCS) Repair procedures

Hyundai Elantra AD (2016-2020) Service Manual / Restraint / SRSCM / Occupant Classification System (OCS) Repair procedures

Removal
Occupant Classification System (OCS) Unit
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 Body - "Front Seat Assembly")
3.
Disconnect the occupant classification system unit connector (A).

4.
Remove the occupant classification system unit (A) after loosening the mounting screws.

Occupant Classification System (OCS) Sensor
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 Body - "Front Seat Assembly")
3.
Remove the front seat cushion assembly.
(Refer to Body - "Front Seat Cushion Cover")
Installation
Occupant Classification System (OCS) Unit
1.
Install the occupant classification system unit on the Front seat track assembly.
2.
Connect the occupant classification system unit connector.
3.
Install the front passenger seat assembly.
(Refer to Body - "Front Seat Assembly")
4.
Reconnect the battery negative cable.
5.
After installing the occupant classification system, 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.
Be sure to perform OCS reset with GDS after replacing OCS unit.
OCS Reset procedure
You should perform OCS Reset procedure after service or replacement about all part of the passenger seat. (Not included full seat assembly)
1.
Ignition "OFF", connect GDS.
2.
Ignition "ON" & Engine "OFF", select Airbag system and "Body Sensor Reset" mode.

3.
The GDS will show the two OCS Reset function steps.
(1)
Erase OCS diagnostic codes.
(2)
OCS initialization.

   
This Step must be done during front passenger seat empty.
4.
Select product configuration.
(1)
C1 : No heater
(2)
C2 : Heater

   
Before the starting the OCS Rest process, cross check seat correct configuration with actual vehicle.
If you see the center console, you can find different buttons per each different seat configuration type. (Refer to the below picture)

5.
The OCS initialization procedure will be performed.
C1 : No Heater Type Reset

C2 : Heater Type Reset (Including Cooling Seat)

   
Erase the SRSCM diagnostic codes after completing the OCS reset.
DTC Code
Code Name
Description
B176300
ECU Defect
1.
Reset(Calibration setting) is not completed
2.
ECU is damaged from physical stress
B176400
MAT Defect
1.
Mat and ECU are not connected .
2.
Mat is damaged from physical stress.
B17672F
Algo cut-off
1.
Too much humidity.
B111117
IGN voltage high
1.
IGN voltage high.
B111216
IGN voltage low
1.
IGN voltage low.
B160388
CAN bus off
1.
CAN Bus is not working.
B169787
ACU communication error
1.
CAN Bus is not working.
2.
ACU is not working.

Occupant Classification System (OCS) Description and Operation
Description In order to make normal activation of airbag system, SRSCM detects DTC(s) for the Occupant Classification System (OCS). If the seat is occupied, OCS detects passenger presences stat ...

Airbag Module
...

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