DTC U1119: Lost Communication with Object Recognition ECU (CAN); DTC U1120: Lost Communication with Object Recognition Camera [09/2015 - ]: Procedure

1. Enter the following menus: Powertrain / Radar Cruise / Data List (Refer to DATA LIST / ACTIVE TEST [09/2015 - ] ).
2. Check the condition of the "Communication with Object Recognition ECU" Data List item.

   HINT: 

   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"	B

Result:  B

B 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to DIAGNOSIS SYSTEM [09/2015 - ] )

Result:  A

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the g1 ECU connector.
2. Disconnect the X18 camera connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   g1-12 (SGND) - X18-12 (SGND)	Always	Below 1 Ω
   g1-13 (RX) - X18-14 (TX)	Always	Below 1 Ω
   g1-14 (TX) - X18-13 (RX)	Always	Below 1 Ω
   g1-13 (RX) - Body ground	Always	10 kΩ or higher
   g1-12 (SGND) - Body ground	Always	10 kΩ or higher
   g1-14 (TX) - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  3

1. Replace the object recognition camera (Refer to REMOVAL [09/2015 - ] ).

Result:  NEXT

NEXT 

See step  4

1. Adjust the object recognition camera (Refer to ADJUSTMENT [09/2015 - ] ).

Result:  NEXT

NEXT 

See step  5

1. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
2. Select "Clear" and clear the data.
3. Based on the DTC detection conditions, try to simulate the malfunction.
4. Recheck for DTCs (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

   OK

   DTC U1119 and U1120 are not output.

Result:  OK

OK 

END (OBJECT RECOGNITION CAMERA IS DEFECTIVE) 

Result:  NG

NG 

See step  6

1. Replace the object recognition ECU (Refer to REMOVAL [09/2015 - ] ).

Result:  NEXT

NEXT 

See step  7

1. Adjust the object recognition camera (Refer to ADJUSTMENT [09/2015 - ] ).

Result:  NEXT

NEXT 

See step  8

1. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
2. Select "Clear" and clear the data.
3. Based on the DTC detection conditions, try to simulate the malfunction.
4. Recheck for DTCs (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

   OK

   DTC U1119 and U1120 are not output.

Result:  OK

OK 

END (OBJECT RECOGNITION ECU IS DEFECTIVE) 

Result:  NG

NG 

REPLACE DRIVING SUPPORT ECU ASSEMBLY 

(Refer to REMOVAL [09/2015 - ] )