Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use this procedure to troubleshoot the theft deterrent system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer to confirm the trouble.

Click here

NEXT

3.

SYMPTOM SIMULATION

NEXT

4.

INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Click here

CAN communication system DTC is output

GO TO CAN COMMUNICATION SYSTEM

CAN communication system DTC is not output

5.

INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the LIN communication system is functioning normally.

Click here

LIN communication system DTC is output

GO TO LIN COMMUNICATION SYSTEM

LIN communication system DTC is not output

6.

CHECK POWER DOOR LOCK CONTROL SYSTEM

(a) Refer to the power door lock control system.

Click here

Power door lock control system is abnormal

GO TO POWER DOOR LOCK CONTROL SYSTEM

Power door lock control system is normal

7.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Refer to the wireless door lock control system.

Click here

Result

Proceed to

Wireless door lock control system is normal

A

Wireless door lock control system is abnormal

B

B

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM

A

8.

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function)

(a) Refer to the smart access system with push-button start (for Entry Function).

Click here

Result

Proceed to

Smart access system with push-button start (for Entry Function) is normal

A

Smart access system with push-button start (for Entry Function) is abnormal

B

B

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function)

A

9.

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

(a) Refer to the smart access system with push-button start (for Start Function).

Click here

Result

Proceed to

Smart access system with push-button start (for Start Function) is normal

A

Smart access system with push-button start (for Start Function) is abnormal

B

B

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

A

10.

CHECK IMMOBILISER SYSTEM

(a) Refer to the immobiliser system.

Click here

Immobiliser system is abnormal

GO TO IMMOBILISER SYSTEM

Immobiliser system is normal

11.

CHECK LIGHTING SYSTEM (EXT)

(a) Refer to the lighting system (EXT).

  • for Triple Beam Headlight

    Click here

  • for Single Beam Headlight

    Click here

Result

Proceed to

Lighting system (EXT) is normal

A

Lighting system (EXT) is abnormal (for Triple Beam Headlight)

B

Lighting system (EXT) is abnormal (for Single Beam Headlight)

C

B

GO TO LIGHTING SYSTEM (EXT)

C

GO TO LIGHTING SYSTEM (EXT)

A

12.

CHECK LIGHTING SYSTEM (INT)

(a) Refer to the lighting system (INT).

Click here

Lighting system (INT) is normal (w/o Power Back Door System)

GO TO STEP 14

Lighting system (INT) is abnormal

GO TO LIGHTING SYSTEM (INT)

Lighting system (INT) is normal (w/ Power Back Door System)

13.

CHECK POWER BACK DOOR SYSTEM

(a) Refer to the power back door system.

Click here

Power back door closer system is abnormal

GO TO POWER BACK DOOR SYSTEM

Power back door closer system is normal

14.

CHECK HORN SYSTEM

(a) Refer to the horn system.

Click here

Horn system is abnormal

GO TO HORN SYSTEM

Horn system is normal

15.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Fault is listed in Problem Symptoms Table

ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE

Fault is not listed in Problem Symptoms Table

16.

PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM*

(a) System Description.

Click here

(b) Terminals of ECU.

Click here

(c) Data List / Active Test.

Click here

NEXT

17.

ADJUST, REPAIR OR REPLACE

NEXT

18.

CONFIRM TEST

NEXT

END

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