Dynamic Radar Cruise Control System

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U1102: Lost Communication with Radar Sensor
U1102 - Lost Communication with Radar Sensor

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 curve radius information based on signals from the steering wheel and yaw rate sensor. The distance control ECU transmits the current vehicle speed and curve radius information to the millimeter wave radar sensor.





WIRING DIAGRAM

Refer to DTC U0235 Dynamic Radar Cruise Control System.

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
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - BODY GROUND)

(a) Disconnect the distance control ECU connector.





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

Standard Resistance:





Text in Illustration





(c) Reconnect the distance control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DISTANCE CONTROL ECU - BODY GROUND)
OK -- Continue to next step.

3. REPLACE DISTANCE CONTROL ECU

(a) Replace the distance control ECU Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

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

(b) Turn the cruise control main switch on.

(c) Drive the vehicle at a speed for which cruise control operation is possible.

(d) Check if the same DTC is recorded.

OK:

DTC is not output.

NG -- REPLACE MILLIMETER WAVE RADAR SENSOR Removal

OK -- END