Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM: U1119: Lost Communication with Object Recognition ECU (CAN)
U1119 - Lost Communication with Object Recognition ECU (CAN)

DESCRIPTION

The driving support ECU uses the millimeter wave radar sensor assembly and lane recognition camera sensor assembly to detect obstacles in front of vehicle.

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 How to Proceed With Troubleshooting.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

(b) Check for DTCs Pre-Collision System.

Result:





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

2. CHECK HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - LANE RECOGNITION CAMERA SENSOR)

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

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

Standard Resistance:





(c) Reconnect the driving support ECU and lane recognition camera sensor assembly connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - LANE RECOGNITION CAMERA SENSOR)
OK -- Continue to next step.

3. REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY

(a) Replace lane recognition camera sensor assembly Removal.

NEXT -- Continue to next step.

4. ADJUST LANE RECOGNITION CAMERA SENSOR ASSEMBLY

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

NEXT -- Continue to next step.

5. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

(b) Clear the DTCs Pre-Collision System.

(c) Turn the power switch off.

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

(e) Drive the vehicle at a speed of 50 km/h (31 mph) or more, and operate lane keeping assist control.

(f) Recheck for DTCs.

OK:

DTC is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END