DTC U1119: Lost Communication with Object Recognition ECU (CAN); DTC U1119: Lost Communication with Object Recognition ECU (Serial); DTC U1120: Lost Communication with Object Recognition Camera: Procedure

1. Use the Data List to check if the communication with object recognition ECU is normal. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
   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 abnormal	-

   RESULT
   
   

   Result	Proceed to
   "Communication with Object Recognition ECU" is "AVAIL"	A
   "Communication with Object Recognition ECU" is "FAIL"	B

B → See step   9 

A: Go to next step 

1. Disconnect the g1 ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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)
   g1-14 (TX) - X18-13 (RX)
   g1-13 (RX) - Body ground	Always	10 kΩ or higher
   g1-12 (SGND) - Body ground
   g1-14 (TX) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the object recognition camera. Refer to REMOVAL [09/2012 - ] .

NEXT: Go to next step 

1. Adjust the object recognition camera. Refer to ADJUSTMENT [09/2012 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [09/2012 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [09/2012 - ] .

   OK

   DTC U1119 and U1120 are not output.

NG → See step   6 

OK → END (OBJECT RECOGNITION CAMERA IS DEFECTIVE) 

1. Temporarily replace the object recognition ECU. Refer to REMOVAL [09/2012 - ] .

NEXT: Go to next step 

1. Adjust the object recognition camera. Refer to ADJUSTMENT [09/2012 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [09/2012 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [09/2012 - ] .

   OK

   DTC U1119 and U1120 are not output.

NG → See step   10 

OK → END (OBJECT RECOGNITION ECU IS DEFECTIVE)