DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [11/2017 - 01/2023]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: System Select / Can Bus Check.

   Refer to DIAGNOSIS SYSTEM [11/2017 - 03/2019] , or refer to DIAGNOSIS SYSTEM [03/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 01/2023]

   CAN Bus Check 

   Result

   Result	Proceed to
   All of the ECUs and sensors that are currently connected to the CAN communication system are displayed	A
   None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2019 - 01/2023] 

Result: 

A 

See step  2

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2017 - 01/2023]

   Body Electrical > Pre-Collision 2 > Clear DTCs 

2. Perform the following procedure.

   HINT: 

   If the following procedure is not performed, the previously output DTC cannot be detected.

   1. Turn the engine switch on (IG) and wait 1 second or more.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [11/2017 - 01/2023]

   Body Electrical > Pre-Collision 2 > Trouble Codes 

   Result

   Result	Proceed to
   DTC U1002 is not output	A
   DTC U1002 is output	B

Result: 

B 

GO TO DTC CHART (U1002). Refer to  DTC U1002: Lost Communication with Gateway Module [11/2017 - 03/2019]  , or refer to  DTC U1002: Lost Communication with Gateway Module [03/2019 - 01/2023]  

Result: 

A 

See step  3

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the B9 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)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B9-5 (CA1P) - B9-6 (CA1N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

4. Connect the B9 millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 

Result: 

OK 

See step  4

1. Disconnect the B9 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 resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B9-1 (SGND) - Body ground	Always	Below 1 Ω

3. Connect the cable to the negative (-) battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B9-8 (IGB) - Body ground	Engine switch on (IG)	11 to 14 V

5. Connect the B9 millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to  COMPONENTS [11/2017 - 01/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)