Lane-Keeping Assist System

CRUISE CONTROL: LANE-KEEPING ASSIST SYSTEM: U1119: Lost Communication with Object Recognition ECU (CAN)
U1119 - Lost Communication with Object Recognition ECU (CAN)

DESCRIPTION

Because of the location of the lane recognition camera assembly, it is subject to high temperatures. If the lane recognition camera sensor assembly becomes too hot, the power source is shut down to protect the system. At that time CAN communication also stops. However, in order to inform the driving support ECU that CAN communication has not stopped because of a CAN communication error, on/off signals are periodically sent from the HITP terminal.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: All ECUs / Lane Keeping Assist / Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO CAN COMMUNICATION CIRCUIT How to Proceed With Troubleshooting
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: All ECUs / Pre-Collision 2/ Data List / Recog ECU H Temp Hist.

(e) Confirm the judgment history.

Pre-Collision 2





Result:





B -- CHECK CAN COMMUNICATION SYSTEM
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - LANE RECOGNITION CAMERA SENSOR)

(a) Disconnect the driving support ECU connector and lane recognition camera sensor connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Reconnect the connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - LANE RECOGNITION CAMERA SENSOR)

OK -- REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY Removal

4. REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - LANE RECOGNITION CAMERA SENSOR)

(a) Repair or replace harness or connector.

NEXT -- Continue to next step.

5. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: All ECUs / Lane Keeping Assist / Trouble Codes.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch off.

(d) Start the engine.

(e) Drive the vehicle and operate lane keeping assist control.

(f) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO CAN COMMUNICATION CIRCUIT How to Proceed With Troubleshooting

A -- END

6. CHECK CAN COMMUNICATION SYSTEM

(a) Check CAN communication system How to Proceed With Troubleshooting.

NG -- GO TO CAN COMMUNICATION CIRCUIT How to Proceed With Troubleshooting
OK -- Continue to next step.

7. REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY

(a) Replace the lane recognition camera sensor assembly Removal.

(b) Adjust the lane recognition camera sensor assembly Adjustments.

NEXT -- Continue to next step.

8. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: All ECUs / Lane Keeping Assist / Trouble Codes.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch off.

(d) Turn the power switch on (IG).

(e) Drive the vehicle and operate lane keeping assist control.

(f) Recheck for DTCs.

OK:

DTC is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END