2010 Hyundai Genesis Smart Key System Description & SMK ECU - BE-52
Scanned service manual page detailing Smart Key passive entry/start functions and ECU operation.
This is page BE-52 from a Body Electrical System service manual section describing the SMART KEY system, uploaded for a 2010 Hyundai Genesis. The page explains that the SMART KEY system lets the user access and operate the vehicle without a traditional key: the user carries a SMART KEY FOB and triggers the system by pressing a push button in the door handle, after which the vehicle sends a limited-range request and the FOB responds automatically. It covers release of the Electrical Steering Column Lock (ESCL), and lists system features including passive unlock and passive locking via driver and passenger doors, passive start, support for a maximum of 2 fobs, an immobilizer backup antenna in the FOB-HOLDER for limp home mode, and communication with the engine management system and SRX. Four operating functions are detailed: passive unlock, passive locking, button start (switching Off/Accessory/Ignition power modes and starting/stopping the engine), and LIMP HOME mode using the FOB HOLDER. The Smart Key ECU (SMK ECU) description explains its inputs (door handle push button, Start Stop Button, P/N position switch), outputs (exterior/interior antennas), CAN/LIN communication, and its 125 kHz encoded challenge signal with RF response. The SMK ECU's main functional blocks are listed, including power supply, microcontroller with FLASH memory, LF antenna amplifier/driver, and CAN/LIN interfaces.
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Frequently asked questions
- How is the Smart Key system triggered to unlock the doors?
- By pressing a push button in the door handle while carrying the SMART KEY FOB; the vehicle sends a limited-range request and the FOB automatically responds, then the system decides whether to unlock, lock, or remain inactive.
- How many smart key fobs can the system handle?
- A maximum of 2 fobs can be handled by the system.
- What is LIMP HOME mode on the Smart Key system?
- A backup mode in which the user can operate all vehicle functions by inserting the key (FOB) into the FOB HOLDER, which contains an integrated immobilizer backup antenna driver for TP authentication.
- What does the Smart Key ECU (SMK ECU) do?
- It manages Passive Unlock, Passive Lock, and Passive Authorization for Engine Start. It reads inputs such as the door handle push button, Start Stop Button (SSB), and P(A/T) or N(M/T) position switch, controls exterior/interior antennas, and communicates via CAN/LIN and single line interfaces.
- How does the SMK ECU communicate with the smart key fob?
- It generates a request (challenge) as an encoded and modulated 125 kHz signal at the inductive antenna outputs and receives the fob's response via the external RF receiver.
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