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. 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 2 / Trouble Codes.
5. Check for DTCs.

   Result

   Result	Proceed to
   CAN communication system DTCs are output	A
   CAN communication system DTCs are not output	B

B → Refer to   8 

A: Go to next step 

1. Disconnect the driving support ECU assembly 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
   L60-30 (B) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A70-1 (SGND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A70-5 (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 Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A70-3 (CA1P) - L60-40 (CA1P)	Always	Below 1 Ω
   A70-2 (CA1N) - L60-18 (CA1N)	Always	Below 1 Ω
   A70-3 (CA1P) or L60-40 (CA1P) - Body ground	Always	10 kΩ or higher

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 power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
5. Check for DTCs.

   Result

   Result	Proceed to
   DTC U0235, U1002 and U1104 are not output	A
   DTC U0235, U1002 or U1104 is output	B

B → Refer to   9 

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