Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001BE5S
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2021]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): U0235; Lost Communication with Cruise Control Front Distance Range Sensor; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]

DTC

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

When the power switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.
  • CAN communication system
  • CAN bus line
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • 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.
  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

HINT:

  • Operating the power switch, any other switches or a door triggers related ECUs and sensors to communicate using the CAN communication system. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the connectors of ECUs or wire harnesses while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Can Bus Check.

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2021 MY Avalon HV [08/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

CAN Bus Check

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
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTCs

(a) Check for DTCs.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result

Proceed to

DTC U1002 is not output

A

DTC U1002 is output

B
B

GO TO DTC CHART (U1002)

A

3.

CHECK FOR OPEN IN CAN BUS MAIN LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the A25 millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-5 (CA1P) - A25-6 (CA1N)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

(d) Connect the A25 millimeter wave radar sensor assembly connector.

NG

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

4.

CHECK FOR DTCs

(a) Check for DTCs.

Chassis > Front Recognition Camera > Trouble Codes

Result

Proceed to

DTC U0235 is not output

A

DTC U0235 is output

B
A

REPLACE DRIVING SUPPORT ECU ASSEMBLY

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY