What is the resistance value of the Audi impact sensor?
3 Answers
Audi impact sensor resistance value is 3-5 ohms. Function of impact sensor: In the event of a severe collision, the airbag provides protection to the occupants, and the device that triggers the airbag deployment is the impact sensor. The impact sensor directly affects the deployment of the airbag, as it determines whether to deploy based on the signals received from the sensor. Therefore, impact sensors are generally installed in areas prone to collisions. Location of impact sensors: In the SRS airbag system, 3-4 impact sensors are installed. They are mounted on the inner side of the front fenders on both sides of the vehicle. For collision severity sensors, one sensor is installed on the left front and right front parts of the vehicle, known as the left front impact sensor and the right front impact sensor. The sensor located in the central front part of the vehicle is called the central impact sensor. As for the protective collision sensor, it is usually installed together with the SRS computer, located under the decorative panel near the central gear shift lever in the cabin.
I've been driving Audi cars for many years. I remember one time when the airbag light suddenly came on in my A6. Upon inspection, it turned out to be an issue with the crash sensor. Regarding the resistance value, generally for Audi models, the sensor resistance ranges around 150 to 500 ohms, depending on the specific model and year. My 2015 model measured just over 200 ohms in actual testing. However, if the value deviates from this range, the airbag might either fail to deploy or deploy erroneously, which could be dangerous. Later, I took it to a professional shop where they used a multimeter to test it and found that the resistance was indeed fluctuating significantly due to aging wiring. My advice is not to tinker with it yourself but to have the entire system thoroughly checked at a repair shop. Also, have them inspect the electrical connectors for looseness or corrosion, as these can affect the resistance. Safety comes first when driving—it's better to spend some money on repairs than to risk an accident.
As a DIY car enthusiast who enjoys small modifications, the resistance value of Audi impact sensors actually varies by model, typically ranging between 100 to 400 ohms. For instance, newer Q5 models might have lower values while older A4s could be higher. You can measure it yourself with basic tools—just use a multimeter on the sensor terminals after turning off the ignition, but be careful to avoid short circuits. If the resistance is off, the sensor might be faulty or the wiring could have water ingress, making the airbag system unreliable. I recommend also checking the onboard computer for trouble codes, as resistance issues often trigger warning lights. Don’t forget to clean dust during inspection—proper maintenance can extend its lifespan.
