ABS Description And Operation: Notes
| Callout | Component Name |
|---|---|
| KSG | CRUISE CONTROL: AUTOMATIC, ADAPTIVE, WITH STOP/GO |
| P16 | P16 Instrument Cluster |
| S48E | S48E Multifunction Switch - Center Console |
| B22 | B22 Brake Pedal Position Sensor |
| K9 | K9 Body Control Module |
| K20 | K20 Engine Control Module |
| K71 | K71 Transmission Control Module |
| K17 | K17 Electronic Brake Control Module |
| Q5 | Q5 Brake Pressure Modulator |
| B5RR | B5RR Wheel Speed Sensor - Right Rear |
| B5LR | B5LR Wheel Speed Sensor - Left Rear |
| B5RF | B5RF Wheel Speed Sensor - Right Front |
| B5LF | B5LF Wheel Speed Sensor - Left Front |
| B129 | B129 Cruise Control Vehicle Distance Sensor Module |
| B99 | B99 Steering Wheel Angle Sensor |
| K36 | K36 Inflatable Restraint Sensing and Diagnostic Module |
This vehicle is equipped with a TRW EBC460 brake system. The electronic brake control module and the brake pressure modulator are serviced separately. The brake pressure modulator uses a four circuit configuration to control hydraulic pressure to each wheel independently.
Depending on options, the following vehicle performance enhancement systems are provided.
- ABS
- Traction Control
- Stability Control
- Dynamic Rear Proportioning
- Hill Descent Control System
- Hill Hold Start Assist
- Cornering Brake Control
- Hydraulic Brake Assist
- Optimized Hydraulic Braking System
- Intelligent Brake Assist
- Trailer Brake Control System
- Trailer Sway Control
The following components listed below are involved in the operation of the brake system:
- Electronic brake control module - The electronic brake control module controls the system functions and detects failures. It supplies voltage to the solenoid valves and pump motor.
- Brake pressure modulator - The brake pressure modulator contains the following components:
- Brake pressure sensor
- Hydraulic pump with pump motor
- Four isolation vales
- Four dump valves
- Two traction/stability control supply valves
- Two traction/stability control isolation valves
- High pressure accumulator
- Low pressure accumulator
- Body control module monitors the brake pedal position sensor signal when the brake pedal is applied and sends a high speed serial data message to the electronic brake control module indicating the brake pedal position.
- Brake pressure sensor is used to sense the action of the driver application of the brake pedal. The sensor provides an analog voltage signal that will increase as the brake pedal is applied. The electronic brake control module monitors the brake pressure sensor which is integral to the brake pressure modulator.
- Instrument cluster - The instrument cluster displays the vehicle speed based on the information from the engine control module. The engine control module sends the vehicle speed information via a high speed serial data to the body control module. The body control module then sends the vehicle speed information via a low speed serial data to the instrument cluster in order to display the vehicle speed, either in kilometers or miles, based on the vehicle requirements.
- Multi-axis acceleration sensor - The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, internal to the inflatable restraint sensing and diagnostic module. The electronic brake control module receives serial data message inputs from the yaw rate, lateral acceleration and longitudinal acceleration sensor and activates stability control and hill hold start assist function depending on multi-axis acceleration sensor input.
- Multifunction switch - The traction control switch is a multifunction momentary switch. The body control module monitors the signal circuit from the traction control switch and sends a high speed serial data message to the electronic brake control module indicating the switch position. The traction control and stability control are manually disabled or enabled by pressing the traction control switch.
- Steering wheel angle sensor - The electronic brake control module receives serial data message inputs from the steering angle sensor. The steering wheel angle sensor signal is used to calculate the intended driving direction.
The steering wheel angle sensor is installed as an internal part of the power steering gear.
- Transmission control module - The electronic brake control module receives high speed serial data message inputs from the transmission control module indicating the gear position of the transmission for hill start assist or hill hold functions.
- Active wheel speed sensors - The electronic brake control module supplies a ignition voltage to each wheel speed sensor. As the wheel spins, the wheel speed sensor produces an alternating current square wave signal. The electronic brake control module uses the frequency of the square wave signal to calculate the wheel speed. The electronic brake control module sends the wheel speed information via high speed serial data to the engine control module.