Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: How To Proceed With Troubleshooting

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Pre-collision / Pre-collision System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the pre-collision system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

PRE-CHECK

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the 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.

INSPECT 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 message is displayed, perform each inspection in the order listed in the table.

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 Unavailable See Owner's Manual"

C

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.

HINT:

Refer to CAN Bus Check in CAN Communication System.

Click here

OK:

CAN communication system is functioning normally.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

5.

CHECK FOR DTCs*

(a) Using the Techstream, check for DTCs.

Body Electrical > Pre-Collision System > Trouble Codes

(b) Make a note of the output DTCs.

Result

Proceed to

DTCs are not output

A

DTC C142571 is output

B

DTCs other than C142571 are output

C
B

GO TO DTC CHART (C142571)

C

GO TO STEP 7

A

6.

CHECK VEHICLE CONTROL HISTORY*

(a) Using the Techstream, check for Vehicle Control History (RoB).

Body Electrical > Pre-Collision System > Utility

Tester Display

Vehicle Control History (RoB)

(b) Record any output Vehicle Control History (RoB).

Result

Proceed to

Vehicle Control History (RoB) codes are not output

A

Vehicle Control History (RoB) code X2006, X2013, X2015, X2022, X2024, X2025, X2026 or X2028 is output

B

Vehicle Control History (RoB) codes other than X2006, X2013, X2015, X2022, X2024, X2025, X2026 and X2028 are output

C
A

GO TO SYMPTOM SIMULATION

B

GO TO VEHICLE CONTROL HISTORY (X2006, X2013, X2015, X2022, X2024, X2025, X2026 or X2028)

C

GO TO STEP 8

7.

RECONFIRM DTC OUTPUT*

(a) Using the Techstream, clear the DTCs.

Body Electrical > Pre-Collision System > 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) Using the Techstream, check for DTCs.

Body Electrical > Pre-Collision System > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
A

GO TO SYMPTOM SIMULATION

B

GO TO DTC CHART

8.

RECONFIRM VEHICLE CONTROL HISTORY*

(a) Using the Techstream, clear the Vehicle Control History (RoB).

Body Electrical > Pre-Collision System > Utility

Tester Display

Vehicle Control History (RoB)

(b) Using the Techstream, check for Vehicle Control History (RoB).

Body Electrical > Pre-Collision System > Utility

Tester Display

Vehicle Control History (RoB)

Result

Proceed to

Vehicle Control History codes (RoB) are not output

A

Vehicle Control History codes (RoB) are output

B
A

GO TO SYMPTOM SIMULATION

B

GO TO VEHICLE CONTROL HISTORY

9.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table for the pre-collision system.

Click here

Result

Proceed to

Problem symptoms are not listed in the Problem Symptoms Table.

A

Problem symptoms are listed in the Problem Symptoms Table.

B
B

GO TO PROBLEM SYMPTOMS TABLE

A

10.

INSPECT WARNING LIGHT

(a) Check the condition of the warning lights.

Result

Proceed to

The PCS warning light is not illuminated

A

Only the PCS warning light is illuminated

B
B

GO TO VEHICLE CONTROL HISTORY (X2015)

A

11.

CHECK FOR DTCs* (Confirmed)

(a) Using the Techstream, check for DTCs (Confirmed).

Body Electrical > Pre-Collision System > Trouble Codes

(b) Make a note of the output DTCs (Confirmed).

Result

Proceed to

DTCs (Confirmed) are not output

A

DTCs (Confirmed) are output

B
B

GO TO STEP 15

A

12.

CHECK VEHICLE CONTROL HISTORY*

(a) Using the Techstream, check for Vehicle Control History (RoB).

Body Electrical > Pre-Collision System > Utility

Tester Display

Vehicle Control History (RoB)

(b) Record any output Vehicle Control History (RoB).

Result

Proceed to

Vehicle Control History codes (RoB) are not output

A

Vehicle Control History codes (RoB) are output

B
B

GO TO VEHICLE CONTROL HISTORY

A

13.

CHECK CONDITIONS WHEN PRE-COLLISION SYSTEM DID NOT OPERATE

(a) Check if the exception conditions for the pre-collision system were met.

Click here

Result

Proceed to

The exception conditions were not met.

A

The exception conditions were met.

B
B

END (The pre-collision system operated accordingly with the operation and prohibition conditions.)
A

14.

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 engine 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

GO TO SYMPTOM SIMULATION

B

ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY

15.

GO TO DTC CHART

(a) Refer to each corresponding DTC (Confirmed) for details on the detection conditions.

Click here

NEXT

END
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