GENERAL INFORMATION
Note. In this manual, F.A.S.T.-key (Free-hand Advanced Security Transmitter) is described as Key less Operation System (KOS). (KOS is indicated as F.A.S.T. in the M.U.T.-III display.)
The keyless operation system (KOS) enables the driver to unlock all the doors and the trunk lid by just pulling the front door outside handle or operating the trunk lid open switch, without taking the key out from his/her pocket or bag when he/she is carrying a keyless operation key that is registered to the vehicle's KOS-ECU. (When the driver's front door outside handle is operated, only the driver's door is unlocked.) KOS also allows the driver to lock all the doors by pressing the lock switch on the front door outside handle (door entry function), and start the engine without using the conventional mechanical key (engine start function). Moreover, KOS incorporates the keyless entry function with which, like the conventional keyless entry system, a driver can perform the remote operation (opening/closing of all the doors, opening of the trunk lid, warning function to warn a person who intends to damage the vehicle*) by operating the lock/unlock button, trunk lid button, and panic button on the keyless operation key. The system also incorporates the immobilizer function that prohibits the starting of engine by using an unauthorized key as well as the tire pressure monitoring system (TPMS) that issues a warning to a driver by illuminating or flashing the warning light if an abnormality to the tire pressure or the system error is detected. KOS has the following features
- Each vehicle is provided with two keyless operation keys, and up to four keyless operation keys can be equipped.
- The keyless operation key also incorporates an indicator light that enables the driver to check if the signal is transmitted correctly or if the battery in the key is discharged.
- The keyless operation key incorporates an emergency key to lock/unlock the front doors when the battery in the keyless operation key is discharged or the keyless operation system is not working normally. Also by using it simultaneously with the keyless operation key (insert the emergency key into the keyless operation key in the inverted direction), the engine can be started. NOTE: If the immobilizer related system failure occurs, the engine may not start.
- The driver can customize KOS; enabling the door entry/engine start function, disabling the door entry/engine start function, enabling the door locking/unlocking function only, or enabling the engine starting function only.
Note. *: Horn sounds and the headlight flashes.
Scheme 1
Scheme 2
Scheme 3
Main components and functions
| Parts name | Functional description | |
|---|---|---|
| KOS-ECU | Controls KOS by using the following inputs/outputs and communications. Input from the unlock sensor and lock switch on each door, input from the push switch on the IG knob Communications with ETACS-ECU, ECM or ASC-ECU and combination meter via CAN Wire communication with the steering lock unit Wireless communication with the keyless operation key via the receiver antenna module, receiver antenna assembly and interior/exterior transmitter antennas Wireless communication with the TPMS transmitter Output to the outer tone alarm | |
| Steering lock (incorporates push switch and steering lock unit) | The steering lock has two unlocking mechanisms; a mechanical mechanism that uses an emergency key and an electrical mechanism. In the electrical unlocking mechanism, the steering lock communicates with KOS-ECU via wire, and when requested by KOS-ECU, the steering lock unlocks for two seconds. | |
| Keyless operation key (incorporates emergency key) | The keyless operation key receives signals sent from each interior/exterior transmitter antenna, certifies the keyless operation key ID code, calculates the key ID, and sends the reply data signal to KOS-ECU via the receiver antenna assembly. The lock button, unlock button, and trunk lid button operations of keyless operation key transmit signals to KOS-ECU via the receiver antenna assembly. If two or more keyless operation keys registered in KOS-ECU respond at the same time, their signals would interfere. To avoid this interference, each signal from KOS-ECU is given the priority (1) data, and the keyless operation keys respond in accordance with this priority. | |
| Lock switch | Driver's door | Locks all the doors when a driver carrying the keyless operation key presses the lock switch on the front door outside handle. |
| Front passenger's door | ||
| Unlock sensor | Driver's door | The unlock sensors incorporated in the driver's front door outside handles unlock driver's the door when a driver carrying the keyless operation key pulls the driver's door outside handle. |
| Front passenger's door | The unlock sensors incorporated in the passenger's front door outside handles unlock all the doors when a driver carrying the keyless operation key pulls the front door outside handle. | |
| Trunk lid opener switch | By pressing the trunk lid opener switch on the trunk lid while he/she is carrying the keyless operation key, the trunk lid is unlocked. NOTE: With the locking of trunk lid, the locking is performed mechanically when the trunk lid is closed. | |
| Exterior transmitter antenna assembly | Driver's side | Converts the data output from KOS-ECU via wire into a signal, and sends it to the keyless operation key. |
| Front passenger's side | ||
| Interior transmitter antenna assembly | Front | Converts the data output from KOS-ECU via wire into a signal, and sends it to the keyless operation key. |
| Rear | ||
| Antenna & tone alarm assembly | Exterior transmitter antenna assembly (trunk lid) | Converts the data output from KOS-ECU via wire into a signal, and sends it to the keyless operation key. |
| Outer tone alarm | The outer tone alarm sounds when: The doors are locked or unlocked by the door entry function. The lock switch on the keyless operation switch is pressed when the IG knob is in the "LOCK" (OFF) position and the push switch is in other than the "ON" position. The lock switch is pressed on the keyless operation key from inside the car. The lock switch on the keyless operation key is pressed when the door is ajar. | |
| Receiver antenna module | Receives the keyless operation key ID data from the keyless operation key which is needed for the engine start, and then outputs the data to KOS-ECU. | |
| Receiver antenna assembly | Receives the operation signals from the lock/unlock buttons, trunk lid button, and panic button on the keyless operation key as well as the keyless operation key ID data which is necessary for engine start and the tire pressure signal from the TPMS transmitter. Then, sends the data to KOS-ECU. | |
| TPMS transmitter | Measure tire pressure directly, then send radio frequency signal to receiver antenna assembly. | |
| Combination meter (Multi information display, TPMS warning light) | Communicates with KOS-ECU via CAN. Receives the warning request or warning information from KOS-ECU, activates (2) the warning light. Warning symbol and message is additionally displayed on the multi information display | |
| ETACS-ECU | Communicates with KOS-ECU via CAN. By the door lock/unlock request, trunk open request, or panic alarm request from KOS-ECU, ETACS-ECU outputs the lock/unlock signal, trunk open signal, or panic alarm signal. When the door lock/unlock signal is output, ETACS-ECU flashes or illuminates the turn signal light and dome light to notify that the lock/unlock operation is performed. | |
| ECM | Communicates with KOS-ECU via CAN. Permits/inhibits the engine starting and controls the engine operation. Send atmospheric pressure data. | |
| ASC-ECU | Communicates with KOS-ECU via CAN. Sends the vehicle speed data. | |
| NOTE: (1) When registering the keyless operation keys, KOS-ECU numbers each key (1 to 4) in the order they are registered (initial priority). This priority is renewed each time the doors are locked/unlocked and the IG knob is pressed. For example, when only keys 1 and 3 have responded to the signal sent from KOS-ECU, the new priority of the keys would be 1-3-2-4. When keys 3 and 4 have responded, then the priority of the keys becomes 3-4-1-2. (2) Illuminates for tire pressure warning. Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning. | ||
| NOTE |
|---|
| With the locking of trunk lid, the locking is performed mechanically when the trunk lid is closed. |
| NOTE |
|---|
| (1) When registering the keyless operation keys, KOS-ECU numbers each key (1 to 4) in the order they are registered (initial priority). This priority is renewed each time the doors are locked/unlocked and the IG knob is pressed. For example, when only keys 1 and 3 have responded to the signal sent from KOS-ECU, the new priority of the keys would be 1-3-2-4. When keys 3 and 4 have responded, then the priority of the keys becomes 3-4-1-2. (2) Illuminates for tire pressure warning. Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning. |
| (1) | When registering the keyless operation keys, KOS-ECU numbers each key (1 to 4) in the order they are registered (initial priority). This priority is renewed each time the doors are locked/unlocked and the IG knob is pressed. For example, when only keys 1 and 3 have responded to the signal sent from KOS-ECU, the new priority of the keys would be 1-3-2-4. When keys 3 and 4 have responded, then the priority of the keys becomes 3-4-1-2. |
| (2) | Illuminates for tire pressure warning. Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning. |
MAIN COMPONENTS AND FUNCTIONS
Scheme 4
TECHNICAL DESCRIPTION (COMMENT)
If no data [ETACS transmits engine random number data to KOS-ECU via the CAN bus lines] is received from the Engine Control Module via the CAN bus lines when the ignition switch is turned to ON position, it is judged as abnormal.
KOS-ECU determines that the abnormality is present when no VIN is recorded in it.
- B1A08: If the difference between the rolling code for the keyless operation key 1 (the first keyless operation key registered with KOS-ECU) and that memorized by KOS-ECU is large, it is judged as abnormal.
- B1A09: If the difference between the rolling code for the keyless operation key 2 (the second keyless operation key registered with KOS-ECU) and that memorized by KOS-ECU is large, it is judged as abnormal.
- B1A0A: If the difference between the rolling code for the keyless operation key 3 (the third keyless operation key registered with KOS-ECU) and that memorized by KOS-ECU is large, it is judged as abnormal.
- B1A0B: If the difference between the rolling code for the keyless operation key 4 (the fourth keyless operation key registered with KOS-ECU) and that memorized by KOS-ECU is large, it is judged as abnormal.
KOS-ECU determines that the abnormality is present, if the key ID is not registered in it when the ignition switch is turned ON.
KOS-ECU determines that the abnormality is present, if the key ID does not match the one registered in it when the ignition switch is turned ON.
KOS-ECU determines that the abnormality is present, if the key certification result and the engine control module status do not match after the engine start permission communication is completed.
KOS-ECU determines that the abnormality is present, if it cannot receive the key ID for the keyless operation key when the ignition switch is turned ON.
If the difference in the ignition switch level shown below occurs consecutively 10 times with the ignition switch in the ON position or START position, when the CAN message (ignition switch position information) from ETACS-ECU, KOS-ECU determines that there is a problem.
B2101
- Status of ignition switch: ON position
- Ignition switch position information: OFF
B2102
- Status of ignition switch: OFF position
- Ignition switch position information: ON
KOS-ECU determines that the abnormality is present when the vehicle information registered in it does not match the vehicle information on the CAN bus lines.
KOS-ECU determines that the abnormality is present when VIN registered in it and the one that has been transmitted on the CAN bus do not match.
When the ignition switch is turned ON with the emergency operation by the inversely-inserted keyless operation key, KOS-ECU sends signals to the receiver antenna module. The receiver antenna transmits random numbers to the keyless operation key when it receives signals from KOS-ECU. If an open circuit or short to ground occurs on the wiring harness between KOS-ECU and receiver antenna at this time, KOS-ECU determines that there is a problem.
Assuming that another keyless operation key has already been registered with KOS-ECU, if the registration of the keyless operation key ID fails when a new keyless operation key is added or the existing key is replaced, KOS-ECU determines that there is a problem.
When the IG knob unlock communication is performed by pressing the ignition push switch, if the steering lock unit communication error (no response) occurs, the steering lock unit is judged as abnormal.
When the ignition push switch is pressed, or when the antenna open circuit detection request is received from the diagnosis function, the failure is detected.
When the ignition push switch is pressed, or when the antenna open circuit detection request is received from the diagnosis function, the failure is detected.
When the ignition push switch is pressed, or when the antenna open circuit detection request is received from the diagnosis function, the failure is detected.
When the ignition push switch is pressed, or when the antenna open circuit detection request is received from the diagnosis function, the failure is detected.
When the ignition push switch is pressed, or when the antenna open circuit detection request is received from the diagnosis function, the failure is detected.
If an abnormality in power supply of the outside or inside transmitter antenna is detected when power supply of it is turned on, KOS-ECU determines that there is a problem.
If an abnormality in power supply of the steering lock unit is detected when power supply of it is turned on, KOS-ECU determines that there is a problem.
If an abnormality in power supply of the unlock sensor is detected when power supply of it is turned on, KOS-ECU determines that there is a problem.
When the ignition switch is turned to ON, KOS-ECU transmits the signal to the receiver antenna module and receiver antenna assembly. The receiver antenna module and receiver antenna assembly transmits random numbers to the keyless operation key when it receives signals from KOS-ECU. If an open circuit or short to ground occurs on the wiring harness between KOS-ECU and receiver antenna module or receiver antenna assembly at this time, KOS-ECU determines that there is a problem.
KOS-ECU determines that the abnormality is present, if the data abnormality is found when the ignition switch is turned ON and then EEPROM is written.
CIRCUIT OPERATION
KOS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
If the M.U.T.-III cannot communicate with the KOS-ECU, the CAN bus lines may be defective. If the KOS-ECU does not work, the KOS-ECU or the power supply circuit may be defective.
If only some keyless operation keys cannot be registered, the keyless operation key itself may be faulty. If no keyless operation key can be registered, the key assembly may have already been registered for another vehicle, or the KOS-ECU may be faulty.
If the KOS-ECU does not work at all or if the KOS-ECU cannot communicate with the scan tool, the KOS-ECU power supply or the ground circuit may be defective.
Inspection Procedure 4: Keyless operation warning display does not disappear
| CAUTION | Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal. |
Inspection Procedure 5: IG knob will not turn (keyless operation is not recognized)
| CAUTION | Before replacing the ECU, ensure that the communication circuit is normal. |
Scheme 5
If the fuel injection does not work, KOS-ECU and the MFI system may have a problem. This symptom is not considered abnormal when the engine is started by an keyless operation key that has not been registered.
The receiver antenna module assembly lock and unlock signals from the keyless operation key, and sends them to KOS-ECU, and further to ETACS-ECU. Also, when ETACS receives signals from the key reminder switch and all the door switches, ETACS-ECU judges them to activate the keyless entry system.
After the door is unlocked with the keyless entry function, if no operation is performed, the door is locked when the time specified by a customization function has elapsed. However, an open signal from any door, key reminder switch OFF (with the key inserted) signal, or ignition push switch ON signal has been input to ETACS, the KOS timer will not operate.
When the keyless entry function is used, the keyless entry hazard answerback function, dome light answerback function or horn answerback function operate as set by ETACS customization function (If the flashing count is set to 0 with a customization function, no answerback function is performed).
| CAUTION | Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the com munication circuit are normal. |
Scheme 6
The receiver antenna assembly receives the trunk signals from the keyless operation key, and sends them to KOS-ECU, and further to ETACS-ECU. Then the ETACS-ECU determines to actuate the trunk open function of the keyless entry system.
The outer tone alarm sounds under the following conditions.
- When the door is locked or unlocked with the keyless or keyless operation function
- Door lock does not operate.
- The keyless operation key is brought out of the vehicle.
Input signal from the keyless entry transmitter is used to operate the keyless entry system. If the signal is abnormal, the keyless entry system will not work normally.
KEYLESS OPERATION KEY BATTERY CHECK
Measure the voltage of the battery. If the voltage of the battery is lower than the standard value, replace the battery.
Standard value: 2.5 - 3.2 V