Dynamic Radar Cruise Control System

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0122, U0123, U0126, U0293, U1104: Lost Communication with Vehicle Dynamics Control Module
U1104 - Lost Communication with Driving Support ECU

DESCRIPTION

These DTCs are stored when a communication malfunction occurs between the sensors and ECUs.





WIRING DIAGRAM

Refer to System Diagram System Diagram.

Refer to U0235 Dynamic Radar Cruise Control System.

INSPECTION PROCEDURE

PROCEDURE

1. READ OUTPUT DTC

(a) Connect the Techstream to the DLC3.

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

(c) Turn the tester on.

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

(e) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(f) Read the DTCs.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream to check if the CAN communication system is functioning normally How to Proceed With Troubleshooting.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

3. 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.

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

(a) Disconnect the driving support ECU assembly connector.





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

Standard Resistance:





Text in Illustration





(c) Reconnect the driving support ECU assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)
OK -- Continue to next step.

5. REPLACE DRIVING SUPPORT ECU ASSEMBLY

(a) Replace the driving support control ECU assembly Removal.

NEXT -- Continue to next step.

6. CHECK WHETHER DTC OUTPUT RECURS (DTC U1104)

(a) Connect the Techstream to 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 MILLIMETER WAVE RADAR SENSOR ASSEMBLY Removal

A -- END