Dynamic Radar Cruise Control System

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0235-737: Communication Error from Radar Sensor to Distance Control ECU
U0235-737 - Communication Error from Radar Sensor to Distance Control ECU

DESCRIPTION

The millimeter wave radar sensor and distance control ECU transmit the data for general vehicle control and diagnosis function along the communication line. The distance control ECU determines the presumed R information based on the signal from the steering wheel and yaw rate sensor. The distance control ECU transmits the current vehicle speed and presumed R information to the millimeter wave radar sensor.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When the distance control ECU is replaced with a new one, initialization must be performed Installation.
* 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 (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR)

(a) Disconnect the distance control ECU connector.

(b) Disconnect the millimeter wave radar sensor connector.

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

Standard resistance:





(d) Reconnect the distance control ECU connector.

(e) Reconnect the millimeter wave radar sensor connector.

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

2. CHECK DISTANCE CONTROL ECU





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

Standard voltage:





Text in Illustration





NG -- REPLACE DISTANCE CONTROL ECU
OK -- Continue to next step.

3. CHECK MILLIMETER WAVE RADAR SENSOR

(a) Check the signal waveform between terminals LRDD (K13-22) and SGND (K13-10) of the distance control ECU connector.





OK:

A waveform similar to that in the illustration on the left is output.

HINT
* Gauge set: 2 V/DIV., 10 msec./DIV.
* Condition: Power switch on (IG)

NG -- REPLACE MILLIMETER WAVE RADAR SENSOR

OK -- REPLACE DISTANCE CONTROL ECU

4. REPLACE MILLIMETER WAVE RADAR SENSOR

(a) Replace the millimeter wave radar sensor.

(b) Adjust the millimeter wave radar sensor Adjustments.

NEXT -- Continue to next step.

5. CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) 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 at a speed of between 45 and 140 km/h (27 and 87 mph).

(2) Turn the cruise control main switch on.

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

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

(g) Read the DTCs Dynamic Radar Cruise Control System.

Result:





B -- REPLACE DISTANCE CONTROL ECU

A -- END