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- "Pre-Collision System Unavailable"
- "Pre-Collision System Unavailable Clean Sensor"
- "Front Camera Unavailable"
- "Front Camera Vision Blocked Clean and Demist Windshield"
Lexus NX: How To Proceed With Troubleshooting
Lexus NX Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use these procedures to troubleshoot the pre-collision system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
| 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.
|
| 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: | C |
| Pre-collision system warning message is not displayed | D |
| A | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
| C | | GO TO STEP 6 |
| D | | GO TO STEP 9 |
|
| 4. | CHECK CAN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Click here .gif)
OK:
CAN communication system is functioning normally.
| NG | | GO TO CAN COMMUNICATION SYSTEM |
|
| 5. | CHECK FOR DTC* (PRE-COLLISION SYSTEM) |
(a) Check for DTCs.
Click here
| 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 |
|
| 6. | CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM) |
(a) Check for vehicle control history and note any codes that are output.
Click here
| 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 |
|
| 7. | CHECK FOR VEHICLE CONTROL HISTORY* (PRE-COLLISION SYSTEM) |
(a) Clear the vehicle control history.
Click here
| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Recheck for vehicle control history.
(1) Check if the following vehicle control history is output.
Click here
| 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
(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
| 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 |
|
| 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 |
|
| 11. | CHECK FOR VEHICLE CONTROL HISTORY* (X2015) |
(a) Check for vehicle control history and note any codes that are output.
Click here
| 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
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC is output | B |
| B | | GO TO STEP 14 |
|
| 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
| 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 |
|
| 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 |
READ NEXT:
Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE PRE-COLLISION SYSTEM NOTICE:
When the customer requests a change in a function, first make sure that the function can be customized.
Make a note of the current sett
Initialization
INITIALIZATION STEERING SENSOR ZERO POINT CALIBRATION (a) Start the hybrid system. (b) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more. (c) Turn the power switch off
Utility
UTILITY NOTICE: If any of the following parts has been replaced due to pre-collision system malfunction, those systems using those parts may be affected without performing necessary operations.
For
SEE MORE:
Cruise SET Indicator Light Circuit
DESCRIPTION The hybrid vehicle control ECU illuminates the cruise SET indicator by sending request signals to the combination meter assembly via CAN communication. The cruise SET indicator illuminates when the dynamic radar cruise control system is controlling vehicle speed. If the cruise SET indica
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Access / Trouble Codes. Body Electrical > Smart Access > Trouble Codes (e) Check the details of the DTCs. Cl
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