Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

NEXT

2.	INSPECT AUXILIARY BATTERY VOLTAGE

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

Standard voltage:

11 to 14 V (Power switch off)

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

NEXT

3.	CHECK MULTI-INFORMATION DISPLAY

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

HINT:

If more than one warning message is displayed, check in the order of A, B, C and D.

Result	Proceed to
"VSC Turned Off Pre-Collision Brake System Unavailable" is displayed	A
"Pre-Collision System Malfunction Visit Your Dealer" is displayed	B
Any of the following messages is displayed: "Pre-Collision System Unavailable" "Pre-Collision System Unavailable Clean Sensor" "Front Camera Unavailable" "Front Camera Vision Blocked Clean and Demist Windshield"	C
Pre-collision system warning message is not displayed	D

A

GO TO PROBLEM SYMPTOMS TABLE

C

GO TO STEP 6

D

GO TO STEP 9

B

4.	CHECK CAN COMMUNICATION SYSTEM*

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

Click here

OK:

CAN communication system is functioning normally.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

5.	CHECK FOR DTC* (PRE-COLLISION SYSTEM)

(a) Check for DTCs.

Click here

Body Electrical > Pre-Collision System > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC C142571 is output	B
A DTC other than C142571 is output	C

B

GO TO DTC CHART (C142571)

C

GO TO STEP 8

A

6.	CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM)

(a) Check for vehicle control history and note any codes that are output.

Click here

Body Electrical > Pre-Collision System > Utility

Tester Display
Vehicle Control History (RoB)

(1) Record the vehicle control history.

Result	Proceed to
Vehicle control history is not output	A
X2006, X2013, X2015, X2022, X2024, X2025, X2026 or X2028 is output	B
Vehicle control history other than X2006, X2013, X2015, X2022, X2024, X2025, X2026 and X2028 is output	C

A

USE SIMULATION METHOD TO CHECK

B

GO TO VEHICLE CONTROL HISTORY

C

7.	CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM)

(a) Clear the vehicle control history.

Click here

Body Electrical > Pre-Collision System > Utility

Tester Display
Vehicle Control History (RoB)

(b) Recheck for vehicle control history.

(1) Check if the following vehicle control history is output.

Click here

Body Electrical > Pre-Collision System > 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

8.	CHECK FOR DTC* (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision System > Clear DTCs

(b) Reproduce the detection conditions of the recorded DTC.

HINT:

Refer to the flowchart for the detection conditions for each of the DTCs.

(c) Recheck for DTCs.

(1) Attempt to duplicate the malfunction and check if the DTCs are output again.

Click here

Body Electrical > Pre-Collision System > Trouble Codes

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

A

USE SIMULATION METHOD TO CHECK

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

9.	PROBLEM SYMPTOMS TABLE

(a) 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

ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE

A

10.	CHECK PCS WARNING LIGHT

(a) Check the condition of the PCS warning light.

Result	Proceed to
Only the PCS warning light is illuminated.	A
The PCS warning light is not illuminated.	B

B

GO TO STEP 12

A

11.	CHECK FOR VEHICLE CONTROL HISTORY* (X2015)

(a) Check for vehicle control history and note any codes that are output.

Click here

Body Electrical > Pre-Collision System > Utility

Tester Display
Vehicle Control History (RoB)

NEXT

GO TO VEHICLE CONTROL HISTORY

12.	CHECK FOR DTC* (PRE-COLLISION SYSTEM)

(a) Check for DTCs.

Click here

Body Electrical > Pre-Collision System > Trouble Codes

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

B

GO TO STEP 14

A

13.	CHECK CONFIRMED DTC DETECTION CONDITION*

(a) Check detection condition for the confirmed pre-collision system DTC.

Click here

NEXT

END

14.	CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM)

(a) Check for vehicle control history and note any codes that are output.

Click here

Body Electrical > Pre-Collision System > Utility

Tester Display
Vehicle Control History (RoB)

(1) Record the vehicle control history.

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

B

GO TO STEP 16

A

15.	CONDITIONS WHEN PRE-COLLISION SYSTEM OPERATE OR NOT OPERATE

(a) Check the conditions when pre-collision system operates or does not operate.

Click here

Result	Proceed to
Any condition is met.	A
No condition is met.	B

A

END (OPERATION/NO OPERATION CONDITIONS OF PRE-COLLISION SYSTEM IS MET)

B

GO TO STEP 17

16.	CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM)

(a) Check for vehicle control history and note any codes that are output.

Click here

HINT:

Based on the customer's inquiry, check the corresponding factors in the vehicle control history, such as the detection time and date, trip information and elapsed time.

NEXT

END

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

NOTICE:

Before performing beam axis adjustment, check the fitting of the front bumper cover and radiator grille assembly and confirm that there is no warping or deformation.

(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) Turn the cruise control main switch on.

(g) 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

(h) Check the amount of misalignment and make a note.

Standard (before performing adjustment):

Front beam axis misalignment value

Vertical	-5.0 to 5.0 deg.
Horizontal	-0.6 to 0.6 deg.

Result	Proceed to
Front beam axis misalignment value is within the specified range.	A
Front beam axis misalignment value is not within the specified range.	B

A

USE SIMULATION METHOD TO CHECK

B

PERFORM FRONT BEAM AXIS ADJUSTMENT

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