FUNCTION DESCRIPTION
When the Preview Function identifies the need to apply emergency braking by sensing a vehicle ahead in the same lane and the distance and relative speed from it, it applies the brake pre-pressure before the driver depress the brake pedal and helps improve brake response by reducing pedal free play.
The Preview Function shares component parts and diagnosis with the ICC (Intelligent Cruise Control) system.
| CAUTION | This system is only an aid to assist braking operation and is not a collision warning or avoidance device. It is the driver's responsibility to stay alert, drive safely and be in control of the vehicle at all times. |
Operation
- The system detects the distance to the vehicle in front with the ICC sensor integrated unit of ICC (Full Speed Range) and judges the necessity of emergency braking.
- The system detects the accelerator pedal release operation of the driver by the accelerator pedal position sensor and estimates the driver's brake operation intention.
- If the system is judged that the emergency braking is necessary or that the driver has the intention to operate the brake it supplies the power supply to the brake booster to apply pre-pressure and adjusts the brake play.
Note. This system will not operate when the vehicle is moving at approximately 32 km/h (20 MPH) or less.
End of Operation
The pre-pressure function ceases when the following conditions are met
- When the driver depresses the accelerator pedal or the brake pedal.
- If the driver does not operate the accelerator pedal or brake pedal within approximately 1 second.
Scheme 26
Scheme 26: Component Parts Location
Component Description
| X: Applicable |
|---|
| Component | Function Description | Description |
| (1) | (2) | (3) |
| ICC sensor integrated unit | X | X | X | Refer to " DESCRIPTION ". |
| ECM | X | X | X | Refer to " DESCRIPTION ". |
| ABS actuator and electric unit (control unit) | X | X | X | Refer to " DESCRIPTION ". |
| BCM | X | | | Transmits the front wiper request signal to ICC sensor integrated unit via CAN communication. |
| TCM | X | X | | Refer to " DESCRIPTION ". |
| Unified meter and A/C amp. | X | X | X | Receives the meter display signal, ICC warning lamp signal, and IBA OFF indicator lamp signal from ICC sensor integrated unit via CAN communication and transmits them to the combination meter via the communication line. |
| Combination meter | X | X | X | Performs the following operations using the signals received from the unified meter and A/C amp. via the communication line. Displays the ICC system operation status using the meter display signal. Illuminates the ICC system warning lamp using the ICC warning lamp signal. Illuminates the IBA OFF indicator lamp using the IBA OFF indicator lamp signal. |
| ICC brake switch | X | X | X | Refer to " DESCRIPTION ". |
| Stop lamp switch | X | X | X |
| ICC brake hold relay | X | | X | Refer to " DESCRIPTION ". |
| Brake booster control unit | X | X | X | Refer to " DESCRIPTION ". |
| Brake booster | X | | X | Refer to " DESCRIPTION ". |
| Brake pressure sensor | X | | X | Refer to " DESCRIPTION ". |
| Booster solenoid/Release switch | X | | X | Refer to " DESCRIPTION " for booster solenoid. Refer to " DESCRIPTION " for release switch. |
| ICC warning chime | X | X | X | Refer to " DESCRIPTION ". |
| Steering angle sensor | X | | | Refer to " DESCRIPTION ". |
| IBA OFF switch | | | X (4) | Refer to " DESCRIPTION ". |
| (1) Vehicle-to-vehicle distance control mode (2) Conventional (fixed speed) cruise control mode (3) IBA system and Brake Assist (With Preview Function) NOTE: (4) Only IBA system uses |
| (1) | Vehicle-to-vehicle distance control mode |
| (2) | Conventional (fixed speed) cruise control mode |
| (3) | IBA system and Brake Assist (With Preview Function) |
| NOTE |
|---|
| (4) Only IBA system uses |
