DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1104: Lost Communication with Driving Support ECU [02/2014 - 11/2016]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Refer to DIAGNOSIS SYSTEM [02/2014 - 11/2016]

   Result

   Result	Proceed to
   CAN communication is normal	A
   CAN communication is malfunctioning	B

Result:  2

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - 11/2016] 

Result:  1

A 

See step  2

1. Disconnect the A3 millimeter wave radar sensor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A3-5 (IGB) - Body ground	Power switch on (IG)	11 to 14 V
   A3-5 (IGB) - Body ground	Power switch off	Below 1 V

3. Reconnect the A3 millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  3

1. Disconnect the A3 millimeter wave radar sensor assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   A3-1 (SGND) - Body ground	Always	Below 1 Ω

3. Reconnect the A3 millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

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

Result:  1

OK 

See step  4

1. Disconnect the F84 driving support ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F84-30 (B) - Body ground	Power switch on (IG)	11 to 14 V
   F84-30 (B) - Body ground	Power switch off	Below 1 V

3. Reconnect the F84 driving support ECU assembly connector.

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE POWER SOURCE CIRCUIT 

Result:  1

OK 

See step  5

1. Replace the millimeter wave radar sensor assembly.

   Refer to REMOVAL [02/2014 - 11/2016]

NEXT 

1. Perform millimeter wave radar sensor assembly adjustment.

   Refer to ADJUSTMENT [02/2014 - 11/2016]

NEXT 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [02/2014 - 11/2016]

4. Make sure that the DTC detection conditions are met.

   HINT: 

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

5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
6. Check for DTCs.

   Body Electrical > Pre-Collision 2 > Trouble Codes 

   NOTE:

   When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly 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

7. Turn the power switch off.

Result:  1

A 

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) 

Result:  2

B 

REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  COMPONENTS [02/2014 - ]