Lexus NX: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use this procedure to troubleshoot the seat belt warning system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
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| 2. | CUSTOMER PROBLEM ANALYSIS |
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 problem analysis:
| What | Vehicle model, system name |
| When | Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time |
| Where | Whether the problem occurs at a specific location |
| Under what conditions? | Whether the doors were locked or unlocked, whether the power switch was on (IG), whether the hybrid control system has started |
| How did it happen? | Problem symptoms |
|
| 3. | INSPECT AUXILIARY BATTERY VOLTAGE |
(a) Measure the auxiliary battery voltage.
Standard voltage:
11 to 14 V (power switch off)
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.
|
| 4. | CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN DTCs are not output | A |
| CAN DTCs are output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 5. | CHECK DTC OUTPUT (AIRBAG SYSTEM)* |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO AIRBAG SYSTEM |
|
| 6. | CHECK DTC OUTPUT (OCCUPANT CLASSIFICATION SYSTEM)* |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO OCCUPANT CLASSIFICATION SYSTEM |
|
| 7. | CHECK COMBINATION METER ASSEMBLY |
(a) Check the operation of the speedometer and shift indicator on the combination meter assembly.
OK:
The speedometer and shift indicator on the combination meter assembly operate normally.
| NG | | GO TO METER / GAUGE SYSTEM |
|
| 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 |
| B | | ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE |
|
| 9. | OVERALL ANALYSIS AND TROUBLESHOOTING* |
(a) Data List / Active Test
Click here
(b) Terminals of ECU
Click here
(c) Operation check
Click here
(d) Inspection
|
| 10. | REPAIR OR REPLACE |
|
| 11. | CONFIRMATION TEST |
| NEXT | | END |
READ NEXT:
Operation Check
OPERATION CHECK INSPECT DRIVER SIDE SEAT BELT WARNING LIGHT HINT: The front seat belt warning light on the combination meter assembly is used for both the driver side seat and front passenger side sea
Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE SEAT BELT WARNING SYSTEM HINT: The following items can be customized. NOTICE:
When the customer requests a change in a function, first make sure that the function can
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to the Smart Access System with Push-button Start (for Entry Function). Click here HINT:
Use
SEE MORE:
Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: Perform "Inspection After Repairs" after replacing the engine coolant temperature sensor. Click here PROCEDURE 1. INSTALL ENGINE COOLANT TEMPERATURE SENSOR HINT: Perform "Inspection After Repairs" after replacing the engine coolant temperature sensor. Cli
Reassembly
REASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The following procedure is for the LH side.
PROCEDURE 1. TEMPORARILY INSTALL REAR DISC BRAKE BLEEDER PLUG (a) Temporarily install the rear disc brake bleeder plug to the rear disc brake cylinder assembly
