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: 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

B → See step   7 

A: Go to next step 

1. Using the intelligent tester to check if the CAN communication system is functioning normally. Refer to DIAGNOSIS SYSTEM [08/2012 - ] .

   OK

   CAN communication system DTC is not output.

NG → See step   7 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor connector.
   Fig 1: Identifying A2 Connector Terminals

   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.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor connector.
   Fig 2: Identifying A2 Connector Terminals

   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.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the millimeter wave radar sensor. Refer to REMOVAL [08/2012 - ] .
2. Adjust the millimeter wave radar sensor. Refer to ADJUSTMENT [08/2012 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2012 - ] .
2. Turn the power switch on (IG).
3. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2012 - ] .

   Result

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

B → See step   8 

A → END