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.
Front Impact Sensor
The front impact sensors are used to provide the supplemental restraint system module (SRS) with advance information about the collision pulse. This enables the control module to more accurately determine which components to deploy.
The front impact sensors have integrated logic which transmits acceleration data to the supplemental restraint system module (SRS) in the same way as the side impact sensors.
In the event of a collision, the control module calculates the acceleration data from the frontal collision sensors and the internal sensors of the control module to check if the impact is sufficiently great to activate the frontal impact protection.
In the event of a fault in a frontal impact sensor, the control module stores a diagnostic trouble code (DTC). A diagnostic trouble code (DTC) is also stored if the communication between the control module and one of the frontal impact sensors does not function. Each frontal impact sensor has a serial number. The serial number is used to check that the correct frontal impact sensor is installed.
If one or both of the frontal impact sensors stops functioning, the control module uses the remaining acceleration sensor to determine when the collision protection should be activated.
Data is transmitted on the same cable used for power supply. There is a signal/power supply cable to each front impact sensor and a ground cable.
The two front impact sensors are behind 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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