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 U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [03/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.
5. Check for DTCs.

   Result

   Result	Proceed to
   DTC U0235 or U1104 is output	A
   DTC U0235 and U1104 are not output	B

B → GO TO CAN COMMUNICATION SYSTEM 

A: Go to next step 

1. Select "CAN Bus Check" from the "System Selection Menu" on the Techstream.
2. Select "Communication Malfunction Check" from the "CAN Bus Check" screen, and then select "OK".

   OK

   CAN communication is normal.

NG → GO TO CAN COMMUNICATION SYSTEM 

OK: Go to next step 

1. Disconnect the driving support ECU connector.
2. Disconnect the millimeter wave radar sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C1-40 (CA1P) - B1-4 (CA1P)	Always	Below 1 Ω
   C1-18 (CA1N) - B1-3 (CA1N)	Always	Below 1 Ω
   C1-40 (CA1P) or B1-4 (CA1P) - Body ground	Always	10 kΩ or higher
   C1-18 (CA1N) or B1-3 (CA1N) - Body ground	Always	10 kΩ or higher

4. Reconnect the millimeter wave radar sensor connector.
5. Reconnect the driving support ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the driving support ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   C1-30 (B) - Body ground	Engine switch on (IG)	11 to 14 V
   C1-30 (B) - Body ground	Engine switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Driving Support ECU)

3. Reconnect the driving support ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - BODY GROUND) 

OK: Go to next step 

1. Disconnect the driving support ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C1-25 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the driving support ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - BODY GROUND) 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B1-5 (IGB) - Body ground	Engine switch on (IG)	11 to 14 V
   B1-5 (IGB) - Body ground	Engine switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	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 (MILLIMETER WAVE RADAR SENSOR - BODY GROUND) 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B1-2 (SGND) - Body ground	Always	Below 1 Ω

3. Reconnect the millimeter wave radar sensor connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR - BODY GROUND) 

OK: Go to next step 

1. Replace the millimeter wave radar sensor with a new one. Refer to REMOVAL [03/2014 - ] .
2. Perform millimeter wave radar sensor adjustment. Refer to REMOVAL [03/2014 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2014 - ] .
2. Make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the system cannot detect the malfunction.

3. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2014 - ] .
   NOTE:

   When replacing the driving support ECU, always replace it with a new one. If a driving support ECU which was installed to another vehicle is used, the information stored in the driving support ECU will not match the information from the vehicle. As a result, a DTC may be stored.

   Result

   Result	Proceed to
   DTC U0235 and U1104 are not output	A
   DTC U0235 or U1104 is output	B

B → See step   10 

A → END