DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0140: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Airbag ECU; DTC U0293: Lost Communication with HV ECU; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [08/2014 - ]: Procedure

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 and Pre-Collision 2 / Trouble Codes.
5. Check for DTCs.

   Result

   Result	Proceed to
   DTC U1104 is output	A
   DTCs other than U1104 are output	B

Result:  B

B 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to How To Proceed With Troubleshooting [08/2014 - ] )

Result:  A

A 

Refer to  2

1. Using the Techstream to check if the CAN communication system is functioning normally (Refer to Diagnosis System [08/2014 - 08/2015] Refer to Diagnosis System [08/2015 - ] ).

   OK

   CAN communication system DTC is not output.

Result:  NG

NG 

GO TO CAN COMMUNICATION SYSTEM 

(Refer to How To Proceed With Troubleshooting [08/2014 - ] )

Result:  OK

OK 

Refer to  3

1. Disconnect the millimeter wave radar sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A2-5 (IGB) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Millimeter Wave Radar Sensor)

4. Reconnect the millimeter wave radar sensor connector.

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

Refer to  4

1. Disconnect the millimeter wave radar sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A2-2 (SGND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Millimeter Wave Radar Sensor)

3. Reconnect the millimeter wave radar sensor connector.

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

Refer to  5

1. Replace the millimeter wave radar sensor (Refer to Removal [08/2014 - ] ).
2. Adjust the millimeter wave radar sensor (Refer to Adjustment [08/2014 - ] ).

Result:  NEXT

NEXT 

Refer to  6

1. Clear the DTCs (Refer to DTC Check / Clear [08/2014 - ] ).
2. Turn the power switch on (IG).
3. Check if the same DTC is output (Refer to DTC Check / Clear [08/2014 - ] ).

   Result

   Result	Proceed to
   DTC U1104 is not output	A
   DTC U1104 is output	B

Result:  A

A 

END 

Result:  B

B 

REPLACE DRIVING SUPPORT ECU 

(Refer to Removal [08/2014 - ] )