Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the safety connect system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK

HINT:

  • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
  • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
  • The following 5 items are important points for analysis:

    What

    Vehicle model, system name

    When

    Date, time, occurrence frequency

    Where

    Road conditions

    Under what conditions?

    Driving conditions, weather conditions

    How did it happen?

    Problem symptoms

NEXT

3.

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

4.

VERIFY CUSTOMER SUBSCRIPTION IS ACTIVE*

(a) Enter the VIN into Vehicle Inquiry on Techstream and verify subscription type and expiration date.

NEXT

5.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs output.

Click here

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B

B

GO TO CAN COMMUNICATION SYSTEM

A

6.

CHECK FOR DTC

(a) Refer to DTC Check/Clear.

Click here

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTCs are not output.

A

DTCs are output.

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

7.

CHECK VEHICLE CONTROL HISTORY*

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

Click here

Body Electrical > Telematics > Utility

Tester Display

Vehicle Control History (RoB)

Result

Proceed to

No vehicle control history is output

A

Any vehicle control history is output

B

B

GO TO VEHICLE CONTROL HISTORY

A

8.

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

HINT:

If the symptom does not reoccur and no DTC is output, attempt to reproduce the symptoms.

Click here

B

GO TO STEP 10

A

9.

OVERALL ANALYSIS AND TROUBLESHOOTING

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

NEXT

10.

REPAIR OR REPLACE

(a) Check if the DCM (telematics transceiver) has been replaced.

Result

Proceed to

The DCM (telematics transceiver) has been replaced

A

The DCM (telematics transceiver) has not been replaced

B

B

GO TO STEP 12

A

11.

PERFORM DCM ACTIVATION

(a) Perform "DCM ACTIVATION".

Click here

NEXT

12.

CONFIRMATION TEST

NEXT

END

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