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The locking system of the car
The locking system of the car (VIM) is driven by the transmitter. Via serial interface it is exchanged coded messages with the transmission control module (PCM). It also serves to lock and unlock the doors. There is a line of diagnostics. Using this line may be performed by VIM and the PCM. Code Definitions
Code transmitter:
The internal code of each transmitter - fixed code, rolling code and a random code.
VIM is used to unlock and open / close doors Transmission code management:
Internal Code VIM
It can only be used when removing or installing to align VIM-PCM transmitter and VIM. Engine code:
The internal code of PCM that becomes also a source of transfer of control. Code Limp home:
Used to intercept control when a fault line VIM or radio.
A warning  Vehicle engine can be activated only if the vehicle is opened with the transmitter.
Normal operation VIM is provided with a voltage of 9 to 16 V.
Transmitter
The transmitter is used to unlock or lock the doors, and at the same time to unlock or the engine block of engine management.
At the transmitter, there are two buttons, each of which is valid for 20 ms, and pressing the two buttons at once causes no action.
Code - changing, encrypted using a random number, and a special algorithm. Passive protection
The system lock is activated automatically, blocking the car after a delay that depends on the event that has triggered.
After turning off the ignition for 20 seconds.
After receiving the unlocking code RKE: 2 min.
After the procedure, interception, which used the correct code transmission control for 2 minutes.
A warning The last event, thereby enabling determines its own time delay.
For example, if the unlocking was made RKE, while the ignition switch was turned on after 1 minute and after a few seconds, and then turned off, the delay time will be automatically lock 20.
This method of passive protection meets the requirements of the insurance companies of all European states.
The status should be stored in the EEPROM in case of power battery.
Turning the transmitter when the ignition locking system to transfer the mode of release, but does not cause any action doors.
Code transmission control
The internal code of the transfer of control of the receiver may be different for different receivers. Transmission control code may be transmitted to the receiver through a diagnosis connector, or through the interception control procedures described below.
Upon receiving the control code transmission and reception of the first two-time code transmitter for the next 10 seconds the new code will be recorded in place of the former to be removed. This operation must be performed for each transmitter, one after the other.
Due to the presence in the changing of the code transmitter, the two transmitters supplied with the receiver should be different fixed codes that are stored in the receiver's memory. With the introduction of the new transmitter code of one of the old transmitter
will be deleted from the memory in accordance with a simple rule queue.
Get the code transfer control switches the system to standby mode lock, enabling them to start the engine when all transmitters are defective or lost. Receiving invalid codes
In the case where the transmitter frequency coincides with the frequency of the receiver, and the code is invalid, the system remains in the locked state and the door status does not change. In this case, to prevent car theft by fitting code (scan), the receiver is turned off for an interval of time that increases exponentially with each acceptance of an invalid number:
0.2 s, 0.4 s, 0.8 s, and t. D. 25.6 p. Warning signal
When the owner of the door locks, the relay warning signal is switched on for 1 second. When the owner unlocks the door alarm does not sound. Procedure Limp home
The procedure of getting control is needed in order to enable the use of the car in the event of system failure. The procedure for interception acts directly on the PCM does not affect the VIM.
Procedure interception control (called procedure Limp home) does not affect the VIM, which remains in the blocking state.
The transfer of control to the new transmitter will be possible only through the diagnostic connector. Unlocking PCM FOR limphome:
Objective: To unblock a single PCM in case of transmission error code.
Function: entering a personal identification number (PIN), e.g., using MIL accelerator pedal or the diagnostic tool causes unlocking in the case of PCM transmission error in the PCM block.
Enter PIN: PIN set during final assembly, fitting, such as the last digits of the technical passport (only at the request of the buyer: a PIN can be changed by entering a diagnostic tool). To unlock for limphome by entering the PIN using the accelerator pedal
Applicable when VIM locked or in case of an error in the exchange between VIM and PCM.
| PERFORMANCE ORDER | | 1. When the ignition MIL flashes rapidly. This means that the PCM is ready for operation LIMPHOME. | | 2. If the driver presses the (way) to an accelerator pedal (PA), the MIL will turn on for about 2 seconds, then turns off for 2 seconds. This means that the PCM began to take the first digit of the PIN driver. | | 3. The first digit is recognized by RSM, depending on the time when the PA was released. For example, if the driver releases the pedal during the initial shutdown MIL (2), it means that the PCM recognizes "0", and if it is released the pedal in the second turn on or off MIL, it means that the PCM recognize "1" as the first digit. | | 4. After the PCM detects the previous figure, MIL is turned about 5 seconds and during this time the driver has to press the pedal again to enter the next digit. | | 5. In the same manner as described in Step 3, enter the four digit. | | 6. If all the numbers are well recognized and PCM code coincides with the Internal Code RSM, the MIL will switch off. | | 7. Now the engine can be started. | | 8. If the engine is running by using the limphome, off, then restart it driver must repeat the operation limphome, because this function is designed for "single-shot". |
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Slowing
To prevent theft of the vehicle by constant attempts to enter the code transmission control system is blocked for the time interval defined as follows:
After 5 failed attempts the system is locked for a time (N-4) x 20 seconds. N - number of attempts.
After 5 unsuccessful attempts will beep at a frequency of 2,5 ?� 0,5 Hz for 30 seconds.
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