Chapter 38 Security, Navigation, and Advanced Driver Assistance Systems 505 Copyright Goodheart-Willcox Co., Inc. signal, it disables the starting and engine support sys- tems so the vehicle cannot be driven. Remote Keyless Entry A remote keyless entry system allows the driver to unlock a vehicle’s doors without a traditional key. A remote keyless entry system uses a key fob that con- tains a small transmitter. When the driver pushes the button on the key fob to lock or unlock the doors, Tech Tip Vehicle keys cannot be duplicated at hardware stores or locksmiths. You must contact the manufacturer to get service parts and codes. Key fobs are designed to increase security by commu- nicating key information to the vehicle’s ECM. Today’s keys and entry systems include the following: • Transponder key • Remote keyless entry • Keypad entry Transponder Key Some vehicles have a transponder key, which has an embedded electronic chip. Each time the transponder key is inserted into the key cylinder, a coil in the cylinder produces an electromagnetic field that excites the tran- sponder chip. This causes the chip to generate a coded signal, which is amplified and sent to the transponder module. If the transponder module recognizes the signal produced by the chip, it will allow the engine to be started. If the module does not recognize the chip’s Night vision Motion sensing 180° view back-up camera Proximity sensor along perimeter Blind spot monitoring 180° side camera 180° side camera Adaptive headlights Adaptive cruise control Blind spot monitoring Proximity sensors along perimeter Keyless entry Ultrasound and radar sensors Immobilizer and alarm Voice activation HUD display Front camera ParabolStudio/Shutterstock.com Figure 38-1. The driver assist features increase safety and improve driver performance. Some of these systems are dealer options but may soon become mandatory safety equipment. Note the types of advanced driver assist systems and the sensors they use to detect objects that are near or traveling toward the vehicle. Christian Delbert/Shutterstock.com Figure 38-2. Note variations of key fobs. A—The square end of the key fits into the dash socket so that the ECM can read the key’s code. B—Many key fobs have a metal key to open the driver’s door if the car’s battery is dead. C—A keyless fob uses Bluetooth technology to allow the ECM to energize the start button circuit. Marques/Shutterstock.com Marques/Shutterstock.com A Ignition key Valet key Key blade release Key blade fits in side of fob Key blade B Keyless fob C