DESCRIPTION
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 1
- 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 " SYSTEM DESCRIPTION ". System description for LDP: Refer to " SYSTEM DESCRIPTION ". Normal operating condition: Refer to " DESCRIPTION ". |
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (LANE CAMERA UNIT): Description
Always perform the camera aiming adjustment after replacing the lane camera unit.
LDW SYSTEM CONTROL DESCRIPTION
- LDW system is controlled by lane camera unit.
- Lane camera unit monitors lane markers of the traveling lane.
- Combination meter turns the lane departure warning lamp ON/OFF according to the signal from the lane camera unit via CAN communication (through unified meter and A/C amp.).
- When the lane camera unit judges vehicle deviation from the traveling lane, it controls following actions to alert the driver. Requests the lane departure warning lamp activation to combination meter. Controls the lane departure warning buzzer.
Component Description
| Component | Description |
|---|---|
| Lane camera unit | Detects the lane marker by the built-in camera. Judges the lane departure depending on the lane detection result and each signals. Controls the lane departure warning buzzer, lane departure warning lamp and warning systems ON indicator. Transmits warning systems switch signal to ABS actuator and electric unit (control unit) via CAN communication. |
| ABS actuator and electric unit (control unit) | Transmits vehicle speed signal to lane camera unit via CAN communication. Transmits warning systems switch signal to ICC sensor integrated unit via CAN communication. |
| Warning systems switch | Inputs the switch signal to lane camera unit. |
| Warning systems ON indicator (On the warning systems switch) | Indicates LDW system status. |
| Lane departure warning buzzer | Gives a warning according to the direction from lane camera unit. |
| Combination meter | Turns the lane departure warning lamp ON/OFF according to the signal from the lane camera unit via CAN communication (through unified meter and A/C amp.). |
| Lane departure warning lamp (Yellow) | Blinks when LDW is functioning to alert the driver. Stays ON when LDW system is malfunctioning. |
| BCM | Transmits turn indicator signal to lane camera unit via CAN communication. |
| ICC sensor integrated unit | Transmits a warning systems switch signal to the lane camera unit when receiving a warning systems switch signal from the ABS actuator and electric unit (control unit). |
Scheme 2
LDP SYSTEM CONTROL DESCRIPTION
- LDP system is controlled by lane camera unit and LDP controller [ABS actuator and electric unit (control unit)]. NOTE: LDP controller is integrated in the ABS actuator and electric unit (control unit).
- Lane camera unit monitors lane markers of the traveling lane. It transmits the detected lane condition signal to ABS actuator and electric unit (control unit) via CAN communication.
- ABS actuator and electric unit (control unit) detects vehicle conditions depending on each signal.
- Combination meter turns the lane departure warning lamp and LDP ON indicator lamp ON/OFF according to the signals from the lane camera unit via CAN communication (through unified meter and A/C amp.).
- When ABS actuator and electric unit (control unit) judges vehicle deviation from the traveling lane, it controls following actions. Requests warning to the lane camera unit via CAN communication to alert the driver. And then lane camera unit controls the lane departure warning buzzer and it requests the lane departure warning lamp activation to combination meter. Calculates the necessary yaw moment. And then it controls the brake pressure of each wheel individually to generate the intended movement.
- ICC sensor integrated unit receives signals from the AV control unit and the ECM and transmits an LDP ON signal to the ABS control unit.
| Component | Description |
|---|---|
| Lane camera unit | Detects the lane marker by the built-in camera. Judges the lane departure depending on the lane detection result and each signal. Transmits the detected lane conditions to ABS actuator and electric unit (control unit) via CAN communication. Controls the lane departure warning buzzer, lane departure warning lamp, warning systems ON indicator and LDP ON indicator lamp. |
| ABS actuator and electric unit (control unit) | Transmits vehicle speed signal to lane camera unit via CAN communication. Judges necessary yaw moment depending on each signal. Controls the brake pressure of each wheel individually to generate the intended movement. |
| Lane departure warning buzzer | Gives a warning according to the direction from lane camera unit. |
| Dynamic driver assistance switch (On the ICC steering switch) | Inputs the switch signal to ECM. |
| Combination meter | Turns the lane departure warning lamp and LDP ON indicator lamp ON/OFF according to the signals from the lane camera unit via CAN communication (through unified meter and A/C amp.). |
| LDP ON indicator lamp (Green) | Indicates LDP system status. |
| Lane departure warning lamp (Yellow) | Blinks when LDP is functioning to alert the driver. Stays ON when LDW/LDP system is malfunctioning. |
| BCM | Transmits turn indicator signal to lane camera unit via CAN communication. Transmits vehicle conditions to ABS actuator and electric unit (control unit) via CAN communication. |
| ECM | Transmits vehicle conditions and ICC steering switch signal (dynamic driver assistance switch signal) to ICC sensor integrated unit via CAN communication. |
| Steering angle sensor | Transmits steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication. |
| TCM | Transmits vehicle conditions to ABS actuator and electric unit (control unit) via CAN communication. |
| ICC sensor integrated unit | Transmits ICC system conditions to ABS actuator and electric unit (control unit) via CAN communication. Transmits LDP ON signal to ABS actuator and electric unit (control unit) via CAN communication. |
| Yaw rate/side G sensor | Inputs detected yaw rate signal to ABS actuator and electric unit (control unit). |
| AV control unit | Transmits system selection signal to ICC sensor integrated unit via CAN communication. |
CONSULT performs the following functions by communicating with the lane camera unit.
| Select diag mode | Function |
|---|---|
| Work support | Performs the camera aiming. Displays causes of automatic cancellation of the LDP function. |
| Self Diagnostic Result | Displays memorized DTC in the lane camera unit. |
| Data Monitor | Displays real-time data of lane camera unit. |
| Active Test | Enables operation check of electrical loads by sending driving signal to them. |
| ECU Identification | Displays part number of lane camera unit. |
Operation Procedure
Before performing the self-diagnosis for "ABS" with CONSULT, start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.
ECU IDENTIFICATION
ABS actuator and electric unit (control unit) part number can be read.
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control units, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads the required data only.
CAN Communication Signal Chart. Refer to " CAN COMMUNICATION SIGNAL CHART ".
See also:
• DESCRIPTION