RFIS (Right Front Impact Sensor) – Function, Symptoms, Location, and Diagnosis

The RFIS (Right Front Impact Sensor) is an important component of the Supplemental Restraint System (SRS). It detects frontal impacts on the right side of the vehicle and sends a signal to the Airbag Control Module (ACM). Based on data from multiple sensors, the control module decides whether to deploy the airbags and seat belt pretensioners.

What Does RFIS Stand For?

RFIS = Right Front Impact Sensor

Main Functions

• Detects right-front collision impact.
• Sends crash data to the Airbag Control Module.
• Works together with other impact sensors.
• Helps determine airbag deployment timing.

Common Symptoms of a Faulty RFIS

• Airbag warning light remains ON.
• SRS fault codes stored in memory.
• Airbag system disabled.
• Communication fault with impact sensor.

Typical Location

The RFIS is usually mounted behind the front bumper or attached to the right front radiator support. Its exact location varies depending on the vehicle manufacturer and model.

Simple Signal Diagram

 Right Front Impact
        │
        ▼
+------------------+
|       RFIS       |
+------------------+
        │ Signal
        ▼
+------------------+
| Airbag Control   |
| Module (ACM)     |
+------------------+
        │
        ▼
 Airbags / Pretensioners

Diagnosis Tips

• Read SRS trouble codes with a compatible scan tool.
• Inspect the RFIS connector for corrosion or loose terminals.
• Check the wiring harness for damage.
• Replace the sensor only if confirmed defective.

Important Note

Impact sensor wiring, connector pinout, and operating voltage vary by vehicle manufacturer and model. Always refer to the factory service manual before performing measurements or repairs.

Related SRS Components

• LFIS – Left Front Impact Sensor
• ACM – Airbag Control Module
• Clock Spring
• Seat Belt Pretensioner
• Side Impact Sensor

Frequently Asked Questions

Can I drive with a faulty RFIS?

Yes, but the SRS system may not provide full protection during a collision.

Will a bad RFIS illuminate the airbag light?

Yes. A malfunction usually causes the SRS warning light to stay on.

Can RFIS be repaired?

In most cases, impact sensors are replaced rather than repaired.