Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

PRE-CHECK

(a) Measure the auxiliary battery voltage with the power switch off.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

3.	CHECK FOR DTCs (HEALTH CHECK)*

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

(f) Turn the power switch off.

Result	Proceed to
System DTCs other than DTCs related to the dynamic radar cruise control system (Radar Cruise1) and dynamic radar cruise control system (Radar Cruise2) are not output.	A
System DTCs other than DTCs related to the dynamic radar cruise control system (Radar Cruise1) and dynamic radar cruise control system (Radar Cruise2) are output.	B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

4.	CHECK MULTI-INFORMATION DISPLAY

(a) Check if a warning message is displayed on the multi-information display in the combination meter assembly.

HINT:

If more than one message is displayed, perform each inspection in the order of A, B and C.

Result	Proceed to
"Cruise Control Malfunction Visit Your Dealer" is displayed.	A
One of the following warning messages is displayed: "Radar Cruise Control Unavailable See Owner's Manual" "Radar Cruise Control Unavailable"	B
No dynamic radar cruise control system warnings are displayed.	C

B

GO TO STEP 7

C

GO TO STEP 10

A

5.	CHECK CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check that the CAN communication system is functioning normally.

Click here

OK:

CAN communication system is functioning normally.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

6.	CHECK FOR DTCs*

(a) Check for DTCs.

Click here

Powertrain > Radar Cruise1 > Trouble Codes Powertrain > Radar Cruise2 > Trouble Codes

(b) Make a note of any DTCs that are output.

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO STEP 8

A

7.	CHECK VEHICLE CONTROL HISTORY*

(a) Using the Techstream, check for vehicle control history.

Click here

Powertrain > Radar Cruise2 > Utility

Tester Display
Vehicle Control History (RoB)

(b) Record any vehicle control history that is output.

Result	Proceed to
Vehicle control history is not output	A
Vehicle control history X2006, X2013, X2015, X2022, X2026 or X2028 is output	B
Vehicle control history other than X2006, X2013, X2015, X2022, X2026 and X2028 is output	C

A

USE SIMULATION METHOD TO CHECK

B

GO TO VEHICLE CONTROL HISTORY

C

GO TO STEP 9

8.	RECONFIRM DTCs*

(a) Clear the DTCs.

Click here

Powertrain > Radar Cruise1 > Clear DTCs Powertrain > Radar Cruise2 > Clear DTCs

(b) Reproduce the vehicle conditions that were present when the DTCs that were noted were stored.

HINT:

Refer to each corresponding DTC for details on the detection conditions.

Click here

(c) Recheck for DTCs.

Click here

Powertrain > Radar Cruise1 > Trouble Codes Powertrain > Radar Cruise2 > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

A

USE SIMULATION METHOD TO CHECK

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

9.	RECONFIRM VEHICLE CONTROL HISTORY*

(a) Using the Techstream, clear the vehicle control history.

Click here

Powertrain > Radar Cruise2 > Utility

Tester Display
Vehicle Control History (RoB)

(b) Recheck for vehicle control history.

Click here

Powertrain > Radar Cruise2 > Utility

Tester Display
Vehicle Control History (RoB)

Result	Proceed to
Vehicle control history is not output	A
Vehicle control history is output	B

A

USE SIMULATION METHOD TO CHECK

B

GO TO VEHICLE CONTROL HISTORY

10.	PROBLEM SYMPTOMS TABLE

HINT:

Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

B

GO TO PROBLEM SYMPTOMS TABLE

A

11.	INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS MISALIGNMENT READING)*

NOTICE:

Before checking for millimeter wave radar sensor beam axis misalignment, make sure that the radiator grille and front bumper are correctly installed and have not been damaged or modified.

(a) Adjust the reflector height.

Click here

(b) Place the reflector.

Click here

(c) Connect the Techstream to the DLC3.

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

(e) Turn the Techstream on.

(f) Enter the following menus: Body Electrical / Front Radar Sensor / Utility / Front Beam Axis Misalignment Reading.

Body Electrical > Front Radar Sensor > Utility

Tester Display
Front Beam Axis Misalignment Reading

(g) Check the amount of misalignment.

Standard:

Vertical Direction	-5 to 5 deg.
Horizontal Direction	-0.6 to 0.6 deg.

Result	Proceed to
The beam axis values are within specification	A
The beam axis values are not within specification	B

A

USE SIMULATION METHOD TO CHECK

B

ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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