DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1002: Lost Communication with Gateway Module; DTC U1104: Lost Communication with Driving Support ECU [08/2015 - ]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] .

   Result

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

B → See step   8 

A: Go to next step 

1. Disconnect the I187 driving support ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I187-30 (B) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

4. Turn the engine switch off.
5. Reconnect the I187 driving support ECU assembly connector.

NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Disconnect the A85 millimeter wave radar sensor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A85-5 (IGB) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

4. Turn the engine switch off.
5. Reconnect the A85 millimeter wave radar sensor assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A85 millimeter wave radar sensor assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A85-1 (SGND) - Body ground	Always	Below 1 Ω

3. Reconnect the A85 millimeter wave radar sensor assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the millimeter wave radar sensor assembly. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Perform millimeter wave radar sensor assembly adjustment. Refer to ADJUSTMENT [08/2015 - ] .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
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.

   Result

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

B → See step   9 

A → END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)