Dynamic Radar Cruise Control System

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0235: Lost Communication with Cruise Control Front Distance Range Sensor
U0235 - Lost Communication with Cruise Control Front Distance Range Sensor

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed Adjustments.
* Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY POWER SOURCE)

(a) Disconnect the millimeter wave radar sensor assembly connector.





(b) Turn the power switch on (IG).

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

Standard Voltage:





Text in Illustration





(d) Reconnect the millimeter wave radar sensor assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - IG1 RELAY)
OK -- Continue to next step.

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

(a) Disconnect the driving support ECU assembly and millimeter wave radar sensor assembly connectors.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(c) Reconnect the driving support ECU assembly and millimeter wave radar sensor assembly connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)
OK -- Continue to next step.

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

(a) Disconnect the millimeter wave radar sensor assembly connector.





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

Standard Resistance (Check for Open):





Text in Illustration





(c) Reconnect the millimeter wave radar sensor assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)
OK -- Continue to next step.

4. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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





Standard Voltage:





Text in Illustration





NG -- REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

OK -- REPLACE DRIVING SUPPORT ECU ASSEMBLY Removal

5. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly Removal.

(b) Adjust the millimeter wave radar sensor assembly Adjustments.

NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS (DTC U0235)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Clear the DTCs Dynamic Radar Cruise Control System.

(d) 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) and 170 km/h (105 mph).

(2) Turn the cruise control switch (ON-OFF button) on.

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

(e) Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

(f) Read the DTCs.

Result:





B -- REPLACE DRIVING SUPPORT ECU ASSEMBLY Removal

A -- END