Functional Description / User Manual

Transcription

1 Functional Description / User Manual of SIEMENS VDO Immobilization system HONDA RxM Type 5WK49210 / 5WK49215 Functional description_rxm.doc Page 1 of 5

2 1. FUNCTIONAL DESCRIPTION The immobilizer system consists of an engine control module (PGM-FI ECU), a body controller module (MICU), the Immobilizer (RxM) and a key, see Figure 1. The Immobilizer is mounted on to the ignition lock in which the key can be inserted. The Immobilizer is located at the steering column of the vehicle. The RxM is an "active antenna" that contains the following components that are shown in figure 1: 1. Power supply: The voltage regulator is supplied via the SAM with battery voltage (typ. 12V) and supplies the basestation IC (3) with a stable 5V voltage level. 2. Serial interface: This is used to adapt the micro controllers (7) input and output signals to the signal levels required by the external components. The level shifting is done by a series of transistors and RC networks. The circuitry has the typical short-circuit and reverse-battery protection. 3. Basestation IC (PCF7991). The Base station IC drives and modulates the LF antenna (4) to supply the transponder in the key with energy and to transmit data to it. It demodulates the answer from the transponder and sends the demodulated signal to the CPU (7). The Basestation IC does not contain a control logic. Instead, it is controlled by the CPU(7). 4. LF antenna. The LF ("low frequency, typ. 125 khz") antenna is part of the immobilizer housing and is mounted to the ignition lock. 5. Antenna circuitry: The antenna circuit is composed of a resonant tank circuitry (resistor, inductor, and capacitor) which is tuned to 125 khz. This portion of the circuit is used to transmit and receive data to and from the transponder. The data is modulated and transmitted at the proper frequency by the basestation IC (3). The tuning components and voltage limiting resistors are assembled on the PCB. 6. Resonator: A MHz MHz resonator is used to provide a clock frequency to the CPU. 7. CPU: The micro controller controls the basestation IC (3). I.e. it turns the voltage regulator for the basestation IC on and off, controls the communication with the basestation IC and provides the clock for the basestation IC. Furthermor the micro controller controls all the communication with external components connected to the S-Net bus. It does the encryption / decryption of the communication with engine control module (12) and MICU (11). It does the authentication of the transponder (i.e. the cryptology). The micro controller controls the RF receiver (9) and decrypts incoming RF telegrams. It controls the communication with external components via CAN and the communication with the diagnostic computer. 8. Serial interface: This is used to adapt the micro controllers (7) input and output signals to the signal levels required by the diagnostic computer. The level shifting is done by a series of transistors and RC networks. The circuitry has the typical short-circuit and reverse-battery protection. 9. RF receiver: The RF receiver receives RF telegrams at a carrier frequency of 313,85MHz (5WK49210) or 433,92MHz (5WK49215). The RF functionality is not relevant for the immobilizer function. 10. CAN transceiver: This is the interface between the CPU and the physical bus. The physical layer of the CAN bus is high speed. The transmission speed is 125kbps. Functional description_rxm.doc Page 2 of 5

3 +B Power Supply (1) resonator (6) IG interface (2) 10400bps 5V S-NET PGM-FI ECU (12) (11) transponder IC (13) (14) ANT COIL (4) antenna circuit (5) RF (9) PCF7991 (3) KEYLESSIMMOBI. CONTROL UNIT CPU (7) 1 CAN Transceiver + (10) interface (8) DLC METER IMMOBI indicator Power Window Diagnosis tool Figure 1 System Overview Components outside of the smart immobilizer are: 11. MICU: This Body controller supplies a secret key which is requested by the RxM. The secret key is exchanged via the S-Net interface line. 12. ECM (Engine control module): This module supplies a secret key which is requested by the RxM. The secret key is exchanged via the S-Net interface line. 13. Transponder IC in the key. The IC is connected to a parallel resonant circuit formed by the transponder coil (14) and a capacitor. It derives its power supply from the magnetic field established by the immobilizer. The IC provides contactless communication with the immobilizer by demodulating the signals received from the immobilizer and by sending data to the immobilizer via ASK (amplitude shift keying) modulation. 14. Transponder coil in the key: This coil is magnetically coupled at 125 khz to the LF antenna (4). 2. Immobilizer parts The RxM consists of the following parts: 1. Housing including LF antenna, RF antenna and pins for the PCB and connector 2. populated PCB 3. cover Functional description_rxm.doc Page 3 of 5

4 3. Variants 5WK49210 with Receiver 313, 85 MHz 5WK49215 with Receiver 433, 92 MHz US Europe 4. Technical Data Carrier frequency: 125 khz ± 1.25 khz Carrier field strength: < Modulation: ASK Supply voltage: 12 V Battery type: Car battery Range: < 55mm Loop coil antenna area: m 2 5. Typical usage pattern (for Europe only) immobilizer operations in 10 years with a typical transmission duration of 0.1 seconds seconds (= 10 hours) transmission duration in hours 0.41 seconds transmission duration in one hour Transmitter ON 0.41 seconds / hour Transmitter OFF 3, seconds / hour Duty Cycle: T ON / T (ON+OFF) x 100% = 0.41 / 3,600 x 100 % =0.011 % Functional description_rxm.doc Page 4 of 5

5 6. Label US, Canada Mexico: Siemens VDO 5WK49210 Owner Manual: NOTE This device complies with part 15 of the FCC Rules and with RSS -210 of Industry Canada. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept interference received, including interference that may cause undesired operation. CAUTION Changes or modifications not expressly approved by the manufacturer could void the user s authority to operate the equipment. Europe: Siemens VDO 5WK49215 Functional description_rxm.doc Page 5 of 5