Up to 08/2009

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed Adjustments.

PROCEDURE

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

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

Text in Illustration









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

Standard Resistance:





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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the millimeter wave radar sensor connector.

Text in Illustration









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

Standard Resistance:





(c) Reconnect the millimeter wave radar sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU POWER SOURCE CIRCUIT)

(a) Disconnect the driving support ECU connector.





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

Standard Voltage:





Text in Illustration





(c) Reconnect the driving support ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the driving support ECU connector.

Text in Illustration









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

Standard Resistance:





(c) Reconnect the driving support ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK DRIVING SUPPORT ECU

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

Text in Illustration









Standard Voltage:





NG -- REPLACE DRIVING SUPPORT ECU Components
OK -- Continue to next step.

6. REPLACE MILLIMETER WAVE RADAR SENSOR

(a) Replace the millimeter wave radar sensor Components.

(b) Adjust the millimeter wave radar sensor Adjustments.

NEXT -- Continue to next step.

7. CHECK DTC OUTPUT

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

(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 (31 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 Dynamic Radar Cruise Control System.

Result:





B -- REPLACE DRIVING SUPPORT ECU Components

A -- END