Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Frontal Impact Sensor
The car's frontal impact sensors are used to provide the supplemental restraint system module (SRS) with accurate advanced information about the collision pulse. This enables the supplemental restraint system module (SRS) to determine more accurately the components to be activated.
The frontal impact sensors have integrated logic which transmits acceleration data to the supplemental restraint system module (SRS).
The frontal impact sensors transmit continuous OK signals to the control module to indicate that they are working. In the event of a fault in a frontal impact sensor, a fault signal is transmitted to the control module which then stores a diagnostic trouble code (DTC). A diagnostic trouble code (DTC) is also stored when the control module has not received an OK signal. Each frontal impact sensor has a software ID. The ID is used to check that the correct frontal impact sensor is installed.
Data is transmitted on the cable used for power supply, i. e. there is one cable for each frontal impact sensor.
The two frontal impact sensors are under the left and right-hand headlamps.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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