Hyundai Elantra (CN7): SRSCM / Side Impact Sensor (SIS)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Restraint / SRSCM / Side Impact Sensor (SIS)

Description and operation

Description

•	Side Impact Sensors (SIS), each installed on the center part of the right and left front door modules and the right and left center pillars, detects side impact during collision.

•	The pressure-sensitive side collision detection sensor (P-SIS) is a method that senses the pressure when it collides, and is also called P-SIS, and the side collision detection sensor (G-SIS) is a method that senses the acceleration at the time of collision. Also called G-SIS.

•	The SRSCM uses the signals from SIS during side collision to determine whether and when to deploy the side air bag.

Components and components location

Components

1. Pressure Side Impact Sensor (P-SIS)

2. Gravity Side Impact Sensor (G-SIS)

Repair procedures

Removal

Pressure Side Impact Sensor (P-SIS)

Disconnect the negative (-) battery terminal.

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

2.	Remove the front door trim. (Refer to Body - "Front Door Trim")

3.	Disconnect the pressure side impact sensor connector (A) after pushing the lock pin.

4.	Remove the pressure side impact sensor (A) after rotating it in the direction of the arrow.

Gravity Side Impact Sensor (G-SIS)

Disconnect the negative (-) battery terminal.

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

2.	Remove the center pillar trim. (Refer to Body (Interior and Exterior) - "Center Pillar Trim")

3.	Remove the gravity side impact sensor (A) after loosening the mounting bolt and disconnecting the connector (B).

Installation

Pressure Side Impact Sensor (P-SIS)

Check if the battery (-) cable is disconnected.

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

2.	Install a new pressure side impact sensor and connect the pressure side impact sensor connector.

3.	Install the front door trim. (Refer to Body - "Front Door Trim")

4.	Reconnect the battery negative (-) terminal.

After installing the front impact sensor, confirm proper system operation.

•	Turn the ignition switch ON; the SRS indicator light should be turned on for about 6 seconds and then go off.

•	Problems may be occurred in the durability of P-SIS or impact sensing performance may be depreciated if POP-NUT is rotated.

•	The door module must not be transformed because SRSCM judges a impact through the pressure sensor in the door module.

Gravity Side Impact Sensor (G-SIS)

Check if the battery (-) cable is disconnected.

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

Install the new side impact sensor with the screws, then connect the front side impact sensor connector.

Tightening torque :

7.8 - 10.8 N.m (0.8 - 1.0 kgf.m, 6.5 - 5.8 lb-ft)

3.	Install the center pillar trim. (Refer to Body (Interior and Exterior) - "Center Pillar Trim")

Reconnect the battery negative (-) terminal.

•	Turn the ignition switch ON the SRS indicator light should be turned on for about 6 seconds and then go off.

•	You must comply with the specified tightening torques with the tool specified because Gravity – Side Impact Sensors (G-SIS) may be broken or POP-NUT may be rotated.

❮Front Impact Sensor (FIS)

Description and operation DescriptionThe front impact sensor (FIS) is installed in the Front End Module (FEM). They are remote sensors that detect acceleration due to a collision at its mounting location.

Seat Belt Buckle Switch (BS)❯

Description and operation Description• The SRSCM should detect the condition of seat belt buckles (BS) of the driver and passenger seats.

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