Hyundai Elantra: SRSCM / Side Impact Sensor (SIS)
Description and operation
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| 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. |
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| 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. |
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| 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

1. Pressure Side Impact Sensor (P-SIS)
| 2. Gravity Side Impact Sensor (G-SIS)
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Repair procedures
Pressure Side Impact Sensor (P-SIS)
1. | Disconnect the negative (-) battery terminal. •
| Disconnect the battery negative cable, and wait for at least three minutes before beginning work. |
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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. 
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4. | Remove the pressure side impact sensor (A) after rotating it in the direction of the arrow. 

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Gravity Side Impact Sensor (G-SIS)
1. | Disconnect the negative (-) battery terminal. •
| Disconnect the battery negative cable, and wait for at least three minutes before beginning work. |
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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). 
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Pressure Side Impact Sensor (P-SIS)
1. | Check if the battery (-) cable is disconnected. •
| Disconnect the battery negative cable, and wait for at least three minutes before beginning work. |
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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. |
5. | 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. |
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| Problems may be occurred in the durability of P-SIS or impact sensing performance may be depreciated if POP-NUT is rotated. |
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| The door module must not be transformed because SRSCM judges a impact through the pressure sensor in the door module. |
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Gravity Side Impact Sensor (G-SIS)
1. | Check if the battery (-) cable is disconnected. •
| Disconnect the battery negative cable, and wait for at least three minutes before beginning work. |
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2. | 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) |
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3. | Install the center pillar trim. (Refer to Body (Interior and Exterior) - "Center Pillar Trim") |
4. | 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. |
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| 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. |
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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...
Description and operation
Description•
The SRSCM should detect the condition of seat belt buckles (BS) of the driver and passenger seats...
Other information:
Troubleshooting
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The battery must be in good condition and fully charged for this troubleshooting. ..
Component Location Index1. Expansion valve2. Suction & Liquid pipe assembly3. Service port (High pressure)4. Service port (Low pressure)5. A/C Pressure transducer (APT)6. Compressor..