Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VII4
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0235; Lost Communication with Cruise Control Front Distance Range Sensor; 2016 MY Sienna [12/2015 - 08/2016]

DTC

U0235

Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

The millimeter wave radar sensor and driving support ECU transmit the data for general vehicle control and diagnosis function along the CAN communication line. The millimeter wave radar sensor transmits information about the vehicle in front to the driving support ECU.

DTC No.

DTC Detection Condition

Trouble Area

U0235

The ECM detects a communication error signal (from the millimeter wave radar sensor to the driving support ECU) for 0.15 seconds or more while the dynamic radar cruise control is in operation

  • Communication circuit
  • Millimeter wave radar sensor
  • Driving support ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Select "CAN Bus Check" from the "System Selection Menu" on the Techstream.

(b) Select "Communication Malfunction Check" from the "CAN Bus Check" screen, and then select "OK".

OK:

CAN communication is normal.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

2.

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR)

(a) Disconnect the A44 driving support ECU connector.

(b) Disconnect the A36 millimeter wave radar sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A44-40 (CA1P) - A36-4 (CA1P)

Always

Below 1 Ω

A44-18 (CA1N) - A36-3 (CA1N)

Always

Below 1 Ω

A44-40 (CA1P) or A36-4 (CA1P) - Body ground

Always

10 kΩ or higher

A44-18 (CA1N) or A36-3 (CA1N) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - POWER SOURCE)

(a) Disconnect the driving support ECU connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A44-30 (B) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Driving Support ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - BODY GROUND)

(a) Disconnect the driving support ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A44-25 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Driving Support ECU)

(c) Reconnect the driving support ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - POWER SOURCE)

(a) Disconnect the millimeter wave radar sensor connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A36-5 (IGB) - Body ground

Ignition switch ON

11 to 14 V

A36-5 (IGB) - Body ground

Ignition switch OFF

Below 1 V

Text in Illustration

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - BODY GROUND)

(a) Disconnect the millimeter wave radar sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A36-2 (SGND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

REPLACE MILLIMETER WAVE RADAR SENSOR

(a) Replace the millimeter wave radar sensor with a new one (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL ).

(b) Perform millimeter wave radar sensor adjustment (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT ).

NEXT

8.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR ).

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the malfunction cannot be detected.

(1) Drive the vehicle at a speed of 50 km/h (30 mph) or more.

(2) Turn the cruise control main switch on.

(3) Push the -SET switch to activate the cruise control.

(c) Check for DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC is not output

A

DTC U0235 is output

B

A

END

B

REPLACE DRIVING SUPPORT ECU