Hyundai Sonata LF: SRSCM / Occupant Classification Sensor (OCS) Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Restraint / SRSCM / Occupant Classification Sensor (OCS) Repair procedures

Removal

OCS ECU

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 OCS ECU connector (A).

4.	Remove the OCS mounting bolts (B)

OCS Mat

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 OCS ECU connector.

4.	Remove the front seat cushion assembly. (Refer to Body - "Front Seat Cushion Cover")

Installation

OCS ECU

1.	Install the OCS ECU on the Front seat track assembly.

2.	Connect the OCS ECU connector.

3.	Install the front passenger seat assembly. (Refer to Body - "Front Seat Assembly")

4.	Reconnect the battery negative cable.

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.

•	Be sure to perform OCS zeroing with GDS after replacing OCS equipped seat cushion.

OCS Rest 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.

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.

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)

1.	Manual Type

Dual Type

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

B1763

ECU Defect

1.	Reset(Calibration setting) is not completed

2.	ECU is damaged from physical stress

B1764

MAT Defect

1.	Mat and ECU are not connected .

2.	Mat is damaged from physical stress.

B1767

Algo cut-off

1.	Too much humidity.

B1111

IGN voltage high

1.	IGN voltage high.

B1112

IGN voltage low

1.	IGN voltage low.

B1603

CAN bus off

1.	CAN Bus is not working.

B1697

ACU communication error

1.	CAN Bus is not working.

2.	ACU is not working.

Occupant Classification Sensor (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 status and send signal to SRSCM via CAN...

Airbag Module

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