PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U1119, U1120

DESCRIPTION

The driving support ECU uses the front millimeter wave radar sensor, rear millimeter wave radar sensor, driver monitor camera and object recognition camera to detect obstacles in front of and behind the vehicle, and detect the direction that the driver's head is facing. Based on this information, the driving support ECU sends pre-crash control operation signals.

When a serial communication stop between the object recognition ECU and object recognition camera is detected, DTCs U1119 and U1120 are output.

When a CAN communication stop between the object recognition ECU and driving support ECU is detected, DTC U1119 is output.

WIRING DIAGRAM

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (OBJECT RECOGNITION ECU)

   
   

   1. Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise. Then select "DATA LIST".

   2. Check the condition of the "Communication with Object Recognition ECU" Data List item.

      Radar Cruise

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Communication with Object Recognition ECU	Communication with object recognition ECU signal/AVAIL or FAIL	AVAIL: Communication is normal FAIL: Communication is malfunctioning	-

      Tech Tips

      As the "Communication with object recognition ECU" item monitors the CAN communication condition, distinguishing between a CAN communication malfunction and serial communication malfunction is possible. If a CAN communication malfunction may be present, proceed to the DIAGNOSTIC TROUBLE CODE CHART.

      Result

      Result	Proceed to
      "Communication with Object Recognition ECU" is "AVAIL"	A
      "Communication with Object Recognition ECU" is "FAIL" (for LHD)	B
      "Communication with Object Recognition ECU" is "FAIL" (for RHD)	C

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. CHECK HARNESS AND CONNECTOR (OBJECT RECOGNITION ECU - OBJECT RECOGNITION CAMERA)

   

   *1	Front view of wire harness connector: (to Object Recognition ECU)
   *2	RX
   *3	Front view of wire harness connector: (to Object Recognition Camera)

   
   

   1. Disconnect the p1 ECU connector.

   2. Disconnect the X3 camera connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition p1-12 (SGND) - X3-12 (SGND) Always Below 1 Ω p1-13 (RX) - X3-14 (TX) Always Below 1 Ω p1-14 (TX) - X3-13 (RX) Always Below 1 Ω p1-13 (RX) - Body ground Always 10 kΩ or higher p1-12 (SGND) - Body ground Always 10 kΩ or higher p1-14 (TX) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. REPLACE OBJECT RECOGNITION CAMERA

   
   

   1. Replace the object recognition camera Click here.

   
   

   NEXT

4. ADJUST OBJECT RECOGNITION CAMERA

   
   

   1. Adjust the object recognition camera Click here.

   
   

   NEXT

5. CHECK FOR DTC

   
   

   1. Using the intelligent tester, enter the following menus: Body / Pre-Crash2. Then select "DTC".

   2. Select "Clear" and clear the data.

   3. Based on the DTC detection conditions, try to simulate the malfunction.

   4. Recheck for DTCs.

      OK
      DTCs U1119 and U1120 are not output.

   
   

   OK

   END

   NG

6. REPLACE OBJECT RECOGNITION ECU

   
   

   1. Replace the object recognition ECU Click here.

   
   

   NEXT

7. ADJUST OBJECT RECOGNITION CAMERA

   
   

   1. Adjust the object recognition camera sensor Click here.

   
   

   NEXT

8. CHECK FOR DTC

   
   

   1. Using the intelligent tester, enter the following menus: Body / Pre-Crash2. Then select "DTC".

   2. Select "Clear" and clear the data.

   3. Based on the DTC detection conditions, try to simulate the malfunction.

   4. Recheck for DTCs.

      OK
      DTCs U1119 and U1120 are not output.

   
   

   OK

   END

   NG

   REPLACE DRIVING SUPPORT ECU Click here