Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the audio and visual system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS

  • When 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 problem 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.

INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage.

Standard voltage:

11 to 14 V

HINT:

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

NEXT

4.

CHECK CABIN

(a) Check that condensation is not likely to occur in the cabin and that the temperature is not high or extremely low in the cabin.

OK:

Condensation is not likely being produced and the temperature is not high or extremely low.

HINT:

  • A humid cabin and a rapid change in temperature may lead to condensation. Condensation in the cabin may cause a short circuit.
  • The audio and visual system may not operate normally when the temperature is -20°C (-4°F) or lower, or 65°C (149°F) or higher.
NG

SET CABIN TO APPROPRIATE TEMPERATURE

OK

5.

CHECK AUDIO AND VISUAL SYSTEM NORMAL CONDITION

(a) Refer to Check System Normal Condition.

Click here

Result

Proceed to

Symptom is not normal operation.

A

Symptom is normal operation.

B

B

SYMPTOM IS NORMAL OPERATION

A

6.

CHECK CAN COMMUNICATION SYSTEM*

(a) Check if CAN communication system DTCs are output.

Click here

Result

Proceed to

CAN DTCs are not output.

A

CAN DTCs are output.

B

B

GO TO CAN COMMUNICATION SYSTEM

A

7.

CHECK FOR DTC*

(a) Refer to DTC Check / Clear.

Click here

Body Electrical > Navigation System > Trouble Codes

HINT:

Following DTC will not continue to output when clear DTC is performed even if the malfunction is continuing. Therefore, refer to the troubleshooting flowchart before clearing the DTC when the following DTC is output.

  • B1323
  • B1324
  • B1325
  • B1326

Result

Proceed to

DTCs other than B1323, B1324, B1325 or B1326 are output.

A

DTCs B1323, B1324, B1325 or B1326 is output.

B

DTCs are not output.

C

B

GO TO DTC B1323

C

GO TO STEP 11

A

8.

DTC CLEAR*

(a) Refer to DTC Check / Clear.

Click here

Body Electrical > Navigation System > Clear DTCs

HINT:

The present DTCs may not indicate actual malfunctions depending on the vehicle operating conditions.

NEXT

9.

RECHECK FOR DTC*

(a) Refer to DTC Check / Clear.

Click here

HINT:

  • Even if the malfunction symptom is not confirmed, check for DTCs. This is because the system stores history DTCs.
  • If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream.
  • Check the DTCs and inspect the area that the code indicates.
Body Electrical > Navigation System > Trouble Codes

Result

Proceed to

DTCs are output.

A

DTCs are not output.

B

B

GO TO STEP 11

A

10.

DIAGNOSTIC TROUBLE CODE CHART

(a) Find the output code in Diagnostic Trouble Code Chart.

Click here

NEXT

GO TO STEP 13

11.

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 recur and no DTCs are output, attempt to reproduce the symptoms.

Click here

B

GO TO STEP 13

A

12.

PERFORM TROUBLESHOOTING BASED ON MALFUNCTION SYMPTOM

(a) Refer to Terminals of ECU.

Click here

NEXT

13.

CHECK CIRCUIT

(a) Adjust, repair or replace as necessary.

NEXT

14.

RECHECK FOR DTC

(a) After clearing DTCs, recheck for DTCs.

Click here

Body Electrical > Navigation System > Clear DTCs Body Electrical > Navigation System > Trouble Codes
NEXT

15.

PERFORM CONFIRMATION TEST

NEXT

END

READ NEXT:

 Operation Check

OPERATION CHECK REMOTE TOUCH SELF CHECK NOTICE: Before entering self-diagnostic mode, make sure there are no obstacles which may interfere with operation of the remote touch screen, and that the to

 Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZING WITH MULTI-DISPLAY ASSEMBLY (a) Turn the power switch on (IG). (b) Using the multi-display assembly, select "Setup", "General", and then feedback force and change the

 Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: When replacing the radio receiver assembly, always replace it with a new one. If a radio receiver assembly which was installed to another vehicle is used, the following

SEE MORE:

 Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases. If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there is a short in t

 Removal

REMOVAL CAUTION / NOTICE / HINT NOTICE: When the brake pedal is first depressed after replacing the brake pads or pushing back the disc brake piston, DTC C1214 may be output. As there is no malfunction, clear the DTC. While the auxiliary battery is connected, even if the power switch is off, th

© 2016-2024 Copyright www.lexunx.com