DTC U1119: Lost Communication with Object Recognition ECU (CAN): Procedure

1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
2. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC U1119 is output	A
   DTC other than U1119 is output	B

B → See step   9 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Pre-Collision 2/ Data List / Recog ECU H Temp Hist.
5. Confirm the judgment history.

   Pre-Collision 2

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Recog ECU H Temp Hist	Lane recognition ECU temperature condition history/ ON or OFF	ON: History exists OFF: No history	-

   Result

   Result	Proceed to
   ON is displayed	A
   OFF is displayed	B

B → See step   6 

A: Go to next step 

1. Disconnect the driving support ECU connector and lane recognition camera sensor connector.
   Fig 1: Identifying Driving Support ECU - Lane Recognition Camera Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Condition	Condition	Specified Condition
   U4-5 (HITP) - L60-24 (HITP)	Always	Below 1 Ω
   U4-5 (HITP) or L60-24 (HITP) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Lane Recognition Camera Sensor Assembly)
   *2	Front view of wire harness connector (to Driving Support ECU)

3. Reconnect the connectors.

NG → See step   4 

OK → See step   11 

1. Repair or replace harness or connector.

NEXT: Go to next step 

1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
2. Clear the DTC. Refer to DTC CHECK / CLEAR .
3. Turn the power switch off.
4. Start the engine.
5. Drive the vehicle and operate lane keeping assist control.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC U1119 is not output	A
   DTC U1119 is output	B

B → See step   9 

A → END 

1. Check CAN communication system. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

NG → GO TO CAN COMMUNICATION CIRCUIT 

OK: Go to next step 

1. Replace lane recognition camera sensor assembly. Refer to REMOVAL .
2. Adjust the lane recognition camera sensor assembly. Refer to ADJUSTMENT .

NEXT: Go to next step 

1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Turn the power switch off.
4. Turn the power switch on (IG).
5. Drive the vehicle and operate lane keeping assist control.
6. Recheck for DTCs.

   OK

   DTC is not output.

NG → See step   10 

OK → END