What is the PEPS module?
2 Answers
PEPS stands for Passive Entry and Passive Start system. Below are the main components involved in PEPS and their working process: 1. Door handle switch: Most models use a button-style keyless switch on the door handle, while a few employ capacitive touch. From a user experience perspective, capacitive touch is undoubtedly more elegant and effortless, but the component cost is also higher. Additionally, since capacitive switches are triggered by microcurrents without any pressing motion, owners may occasionally find that when the door handle is wet, the car body has static electricity, and the key is nearby, the doors may unlock/lock. 2. Low-frequency antennas: Typically, PEPS-equipped vehicles are equipped with 4 antennas arranged along the central axis of the car, located at the dashboard, center console, rear seats, and trunk. Due to the short transmission distance of low-frequency signals, multiple antennas are deployed to cover all four doors plus the trunk/tailgate, ensuring keyless operation regardless of which door the owner opens. 3. Car key: The car key can generally receive low-frequency trigger signals while transmitting high-frequency unlock signals. 4. RFR high-frequency receiver: Receives the high-frequency unlock signals sent by the key and transmits the information to the door lock module.
Last time I modified my car, I researched PEPS, which is essentially a keyless entry system. Normally, with the key in my pocket, I just approach the car, pull the door handle, and it automatically unlocks. Then, pressing the start button fires up the engine. Once, when the key battery was almost dead, I discovered the mechanical keyhole hidden under the door handle. Besides sensing the key, this system integrates electronic anti-theft authentication and low-frequency antennas in the car, activating automatically within a two-meter range. If the system detects the key outside the car, even if the start button is accidentally pressed, the car won't start—this design is quite secure.
