LANE DEPARTURE WARNING (LDW) SYSTEM: Component Description
| Component | Description |
|---|---|
| ADAS control unit | Judges the lane departure depending on the lane detection result and each signals Controls the warning buzzer and the warning systems ON indicator Transmits lane departure warning lamp signal to combination meter via CAN communication |
| Lane camera unit | Detects the lane marker in travel lane Transmits the detected lane condition signal to ADAS control unit via ITS communication |
| AV control unit | Transmits the system selection signal to ADAS control unit via CAN communication |
| ABS actuator and electric unit (control unit) | Transmits the vehicle speed signal (wheel speed) to ADAS control unit via CAN communication |
| Warning systems switch | Inputs the warning systems switch signal to ADAS control unit |
| Warning systems ON indicator (On the warning systems switch) | Turns on the warning systems ON indicator, according to an warning systems ON indicator signal received from the ADAS control unit |
| Warning buzzer | Activates the warning buzzer, according to a warning buzzer signal received from the ADAS control unit |
| Combination meter | Turns the lane departure warning lamp ON/OFF according to the signals from ADAS control unit via CAN communication |
| BCM | Transmits the turn indicator signal to ADAS control unit via CAN communication |
Scheme 118
LANE DEPARTURE PREVENTION (LDP) SYSTEM: Component Description
| Component | Description |
|---|---|
| ADAS control unit | Judges lane departure based on each signal and calculates yaw moment necessary to generate force which returns the vehicle to the lane Outputs the warning buzzer signal to the warning buzzer Transmits a target yaw moment signal to the ABS actuator and electric unit (control unit) via CAN communication Transmits the lane departure warning lamp signal and LDP ON indicator lamp signal to combination meter via CAN communication |
| Lane camera unit | Detects the lane marker in travel lane Transmits the detected lane condition signal to ADAS control unit via ITS communication |
| ABS actuator and electric unit (control unit) | Transmits the vehicle speed signal (wheel speed) to ADAS control unit via CAN communication Transmits the yaw rate signal and side G sensor signal to ADAS control unit via CAN communication Receives a target yaw moment signal from the ADAS control unit via CAN communication and controls brake pressure of four wheels, respectively |
| Warning buzzer | Activates the warning buzzer, according to a warning buzzer signal received from the ADAS control unit |
| Dynamic driver assistance switch (On the ICC steering switch) | ECM receives an ICC steering switch (dynamic driver assistance switch) signal and transmits the signal to ADAS control unit via CAN communication |
| Combination meter | Turns on the following indicator/warning lamp, according to a signal received for the ADAS control unit via CAN communication LDP ON indicator lamp (Green) Lane departure warning lamp (Yellow) |
| BCM | Transmits the turn indicator signal to ADAS control unit via CAN communication |
| ECM | Transmits the accelerator pedal position signal, engine speed signal and ICC steering switch signal (dynamic driver assistance switch signal) to ADAS control unit via CAN communication |
| Steering angle sensor | Transmits the steering angle sensor signal to ADAS control unit via CAN communication |
| TCM | Transmits the output shaft revolution signal, input speed signal, current gear position signal and shift position signal to ADAS control unit via CAN communication |
| AV control unit | Transmits the system selection signal to ADAS control unit via CAN communication |
Scheme 119
FUNCTION DESCRIPTION
- Lane Departure Warning (LDW) system provides a lane departure warning function when the vehicle is driven at speeds of approximately 70 km/h (45 MPH) or more.
- When the vehicle approaches either the left or the right side of the traveling lane, a warning will sound and the lane departure warning lamp (yellow) on the combination meter will blink to alert the driver.
- The warning does not occur during turn signal operation (Lane change side).
- The warning function will stop when the vehicle returns inside of the lane markers.
EXAMPLE
Scheme 120
When the vehicle approaches the right lane marker, the driver is alerted by the buzzer and the blinking of lane departure warning lamp (yellow).
OPERATION DESCRIPTION
- When the system is turned ON by operating the warning systems switch, ADAS control unit turns ON the warning systems ON indicator.
- Lane camera unit monitors lane markers of the traveling lane. It transmits the detected lane condition signal to ADAS control unit via ITS communication.
- When judging from a lane marker detection signal that the vehicle is approaching the lane marker, the ADAS control unit controls the following item to alert the driver.
- Activates warning buzzer
- ADAS control unit transmits a lane departure warning lamp signal to combination meter via CAN communication and turns ON/OFF the lane departure warning lamp (yellow).
- Lane Departure Prevention (LDP) system provides a lane departure warning and brake control assistance when the vehicle is driven at speeds of approximately 70 km/h (45 MPH) or more.
- When the vehicle approaches either the left or the right side of the traveling lane, a warning sounds and the lane departure warning lamp (yellow) on the combination meter blinks to alert the driver. Then, the LDP system automatically applies the brakes for a short period of time to help assist the driver to return the vehicle to the center of the traveling lane.
- Warning and brake control are not performed during turn signal operation (lane change side).
- The warning and assist functions stop when the vehicle returns to a position inside of the lane marker.
EXAMPLE
Scheme 121
When the vehicle approaches the right lane marker, the driver is alerted by the buzzer and the blinking of lane departure warning lamp (yellow). Simultaneously, the left brake is controlled independently to generate force which returns the vehicle to the lane.
- When the system is turned ON by dynamic driver assistance switch, ADAS control unit transmits LDP ON indicator signal to combination meter via CAN communication.
- Lane camera unit monitors lane markers of the traveling lane. It transmits the detected lane condition signal to ADAS control unit via ITS communication.
- When judging from a lane marker detection signal that the vehicle is approaching the lane marker, ADAS control unit controls the following items. Activates warning buzzer. Transmits a lane departure warning lamp signal to combination meter via CAN communication. Calculates necessary yaw moment to transmit a target yaw moment signal to ABS actuator and electric unit (control unit) via CAN communication.
- When receiving the target yaw moment signal, ABS actuator and electric unit (control unit) controls brake pressure of four wheels, respectively.
- When receiving the signal from ADAS control unit, combination meter turns ON/OFF the lane departure warning lamp (yellow) and the LDP ON indicator lamp (green).
DESCRIPTION
The DTC is displayed on the information display by operating the ICC steering switch.
On Board Self-diagnosis System Diagram
Scheme 122
In general, each customer feels differently about an incident. It is important to fully understand the symptoms or conditions for a customer complaint.
There are many operating conditions that lead to the malfunction. A good grasp of such conditions can make troubleshooting faster and more accurate.
Some conditions may cause the lane departure warning lamp to stay ON.
Utilize a work sheet sample to organize all of the information for troubleshooting.
KEY POINTS
- WHAT..... System and functions
- WHEN..... Date, Frequencies
- WHERE..... Road conditions
- HOW..... Operating conditions, Symptoms
Scheme 123
- Perform action test to verify the customer's concern.
- Perform action test and check the system operation after system diagnosis.
| WARNING | Be careful of traffic conditions and safety around the vehicle when performing road test. |
| CAUTION | Fully understand the following items well before the road test; Precautions: Refer to " PRECAUTION FOR LDW/LDP SYSTEM SERVICE ". System description for LDW: Refer to " LANE DEPARTURE WARNING (LDW) SYSTEM: SYSTEM DESCRIPTION ". System description for LDP: Refer to " LANE DEPARTURE PREVENTION (LDP) SYSTEM: SYSTEM DESCRIPTION ". Handling precaution: Refer to " PRECAUTIONS FOR LANE DEPARTURE WARNING/LANE DEPARTURE PREVENTION ". |
Always adjust the camera aiming after removing and installing or replacing the lane camera unit.
| CAUTION | The system does not operate normally unless the camera aiming adjustment is performed. Always perform it. |
Always adjust the camera aiming after removing and installing or replacing the lane camera unit.
| CAUTION | Place the vehicle on level ground when the camera aiming adjustment is operated. Follow the CONSULT when performing the camera aiming. (Camera aiming adjustment cannot be operated without CONSULT.) |
Scheme 124
- PERFORM SELF-DIAGNOSIS Perform self-diagnosis of ADAS control unit and lane camera unit. Is any DTC detected? Except "C1B01": Perform diagnosis on the detected DTC and repair or replace the applicable item. Refer to " «DTC INDEX»(ref-573648-S39765040642013082200000) " (ICC/ADAS) or " «DTC INDEX»(ref-573648-S42557798262013082200000) " (LANE CAMERA). "C1B01" or no DTC: GO TO 2.
- PREPARATION BEFORE CAMERA AIMING ADJUSTMENT Perform pre-inspection for diagnosis. Refer to " «INSPECTION PROCEDURE»(ref-573648-S33418935872013082200000) ". Adjust the tire pressure to the specified pressure value. Maintain no-load in vehicle. Check if coolant and engine oil are filled up to correct level and fuel tank is full. Shift the selector lever to "P" position and release the parking brake. Clean the windshield. Completely clear off the instrument panel. : GO TO 3.
- PREPARATION OF AIMING ADJUSTMENT JIG Prepare the aiming adjustment jig according to the following procedure and the figure. Print out the target mark attached in this service information. Refer to " «WORK PROCEDURE (TARGET MARK SAMPLE)»(ref-573648-S05400515862013082200000) ". Stick a printed target mark on the board with a scotch tape or a piece of double-sided tape. NOTE: Use the board that peripheral area of the target is monochrome such as a white-board. Notice that the cross of the target is horizontal and vertical. Diameter of a target (D): 200 mm (7.87 in) Height of a target center (H): 1450 mm (57.09 in) Width between a right target center from a left target center: 600 mm (23.62 in) : Go to " «WORK PROCEDURE (TARGET SETTING)»(ref-573648-S11162436602013082200000) ".
ADAS control unit judges the gear position based on the following signals.
- Current gear position signal transmitted from TCM via CAN communication.
- Value of gear ratio calculated from input speed signal transmitted from TCM via CAN communication.
- Value of gear ratio calculated from the vehicle speed signal transmitted from ABS actuator and electric unit (control unit) via CAN communication.
ADAS CONTROL UNIT: Description
CAN controller controls the communication of CAN communication signal and ITS communication signal, and the error detection.
LANE CAMERA UNIT: Description
CAN controller controls the communication of ITS communication signal and the error detection.
The lane departure warning lamp in the combination meter does not turn ON when turning on the ignition switch
The LDP ON indicator lamp in the combination meter does not turn ON when turning on the ignition switch
The warning of Lane Departure Warning (LDW) and Lane Departure Prevention (LDP) and the yaw moment control are activated during the use of a turn signal.
Note. For the operational conditions of Lane Departure Warning (LDW) and Lane Departure Prevention (LDP), refer to the following descriptions. LDW: " LANE DEPARTURE WARNING (LDW) SYSTEM: SYSTEM DESCRIPTION " LDP: " LANE DEPARTURE PREVENTION (LDP) SYSTEM: SYSTEM DESCRIPTION "
- LDW system setting is not selectable on the navigation screen.
- LDP system setting is not selectable on the navigation screen. NOTE: When the ignition switch is in ACC position, LDW or LDP system settings cannot be changed. "Lane Departure Warning" or "Lane Departure Prevention" is not indicated on the navigation screen. The switching between ON and OFF cannot be performed by operating the navigation system. The item of "Lane Departure Warning" or "Lane Departure Prevention" on the navigation screen is not active.
- After turning ON the ignition switch or starting the engine, LDW or LDP settings of the navigation system cannot be selected for several tens of seconds under the following conditions: After replacing AV control unit. After erasing connection history of the navigation system. After erasing self-diagnosis results of AV control unit.
- The LDW or LDP system setting differs from the one set at the previous driving. NOTE: Turn OFF the ignition switch and wait for 5 seconds or more.