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 |
|
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| 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
|
| 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.
|
| 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 | .gif) | SET CABIN TO APPROPRIATE TEMPERATURE |
|
| 5. | CHECK AUDIO AND VISUAL SYSTEM NORMAL CONDITION |
(a) Refer to Check System Normal Condition.
Click here .gif)
| Result | Proceed to |
|---|---|
| Symptom is not normal operation. | A |
| Symptom is normal operation. | B |
| B | | SYMPTOM IS NORMAL OPERATION |
|
| 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 |
|
| 7. | CHECK FOR DTC* |
(a) Refer to DTC Check / Clear.
Click here
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 |
|
| 8. | DTC CLEAR* |
(a) Refer to DTC Check / Clear.
Click here
HINT:
The present DTCs may not indicate actual malfunctions depending on the vehicle operating conditions.
|
| 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.
| Result | Proceed to |
|---|---|
| DTCs are output. | A |
| DTCs are not output. | B |
| B | | GO TO STEP 11 |
|
| 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 |
|
| 12. | PERFORM TROUBLESHOOTING BASED ON MALFUNCTION SYMPTOM |
(a) Refer to Terminals of ECU.
Click here
|
| 13. | CHECK CIRCUIT |
(a) Adjust, repair or replace as necessary.
|
| 14. | RECHECK FOR DTC |
(a) After clearing DTCs, recheck for DTCs.
Click here
|
| 15. | PERFORM CONFIRMATION TEST |
| NEXT | | END |
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