Contents: Key ↓ Key slot ↓ Table 1.30. Purpose of the main…↓ Key lock solenoid ↓ Table 1.32. Operating mode of the…↓ Steering lock device (with…↓ Maintenance recommendation ↓ Design and operating principle ↓
Key
Fig. 1.65. Ignition key
The key functions as the ignition key in the conventional system. Until the transponder key recognition ECU recognizes the key identification code, the functions of switching the power mode, starting the engine, or unlocking the steering wheel with the engine start button are disabled.
The key transmits an identification code to the transponder key recognition ECU when the key is inserted into the slot.
There is also a mechanical key that can be used in an emergency if the remote door lock control system fails (for example, due to a discharged transponder battery). If the remote door locking system does not work, the mechanical key can be used to unlock the driver's side door.
Key slot
Fig. 1.66. Block diagram and operating principle of the key socket
The key socket consists of an inductor coil, a receiver, socket illumination LEDs, a half-key installation sensor, a full key installation sensor and a key locking electromagnet.
The key half-insertion switch, which is used to detect the position of the key in the key slot, is connected to the key recognition ECU and the passenger side switch unit ECU. The key recognition ECU and the passenger side switch unit ECU use the signal from the key half-insertion switch to check the key code and to control the electrical system.
Like the half-key sensor, the full-key sensor is also used by the system to detect the key position. This sensor is connected to the power supply ECU. The power supply ECU controls the push-button start system according to the signals from this sensor.
Warning! Do not allow your fingers to enter the key slot. This may result in injury to your fingers.
Note: The following instructions must be followed, otherwise the key mechanism may be damaged or not work properly.
- - You should handle the key with clean hands.
- - Do not force the key into the slot.
- - Only original keys may be inserted into the slot.
- - If the key cannot be removed, do not pull it out with force.
- - Do not allow water, oil, foreign objects, etc. to enter the socket.
- - Do not insert a wet, oily or damaged key into the socket.
- - It is prohibited to stick labels on the key.
- - Do not insert the key in the wrong position.
- - When removing the key from the socket, do not pull on the ring.
Table 1.30. Purpose of the main components
Key lock solenoid
Fig. 1.67. Key locking electromagnet
The power supply system ECU turns on the key lock solenoid according to the power mode of the engine start button and the position of the gear shift lever (depending on whether the parking mode or some other mode is enabled), to secure the key in the slot and prevent accidental removal of the key.
When the key locking electromagnet is activated, the locking pin, which has entered the hole on the side surface of the key, is locked. As a result, the key is fixed in the socket.
Table 1.32. Operating mode of the key lock electromagnet
Steering lock device (with integrated steering lock ECU)
Fig. 1.68. Block diagram of the steering lock system
Along with the engine start button, the car uses an electric steering lock system that locks and unlocks the steering shaft. The system unlocks the steering shaft when the engine start button is pressed after the key is inserted into the socket and locks the steering shaft when the key is removed from the socket, if the" Off " mode is enabled. ("OFF") or ACC of the power supply system.
The steering lock ECU is integrated into the steering lock unit. It controls the electric drive that moves the locking bar.
The steering lock ECU detects the position (blocked/unblocked) locking plate and transmits this information to the power supply system ECU, key recognition ECU and other ECUs.
The information was taken from a web portal [TOYOTAMAN]
As shown in the diagram below, the steering lock ECU communicates with the power supply ECU and the key recognition ECU. When it receives permission signals from both ECUs, it activates the lock motor. In addition, the steering lock ECU transmits an unlock signal to the power supply ECU and the key recognition ECU. When it receives this signal, the power supply ECU allows the engine ECU to start the engine, and the key recognition ECU deactivates the immobilizer.
Maintenance recommendation
It is not possible to replace only the steering lock ECU in the steering lock device. Therefore, if the steering lock ECU is faulty, the entire steering lock device must be replaced.
Design and operating principle
Fig. 1.69. Design and operating principle of the steering lock system
The steering lock device consists of a steering lock ECU and an electric drive. The electric drive consists of an electric motor that creates the driving force, gears for transmitting the driving force, a steering shaft locking plate, and sensors that determine the position of the locking plate.
The gears convert the rotary motion of the electric motor shaft into vertical translational motion of the carriage. The locking plate, mounted on the carriage, also moves vertically. The tongue of the plate falls into the recess between the teeth of the gear on the steering shaft, reliably locking the steering.
The sensor detects the position of the locking plate, i.e. whether the steering shaft is locked. This information is then transmitted to the steering lock ECU.