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 |
|
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| 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
|
| 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.
|
| 4. | VERIFY CUSTOMER SUBSCRIPTION IS ACTIVE* |
(a) Enter the VIN into Vehicle Inquiry on Techstream and verify subscription type and expiration date.
|
| 5. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs output.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output. | A |
| CAN communication system DTCs are output. | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 6. | CHECK FOR DTC |
(a) Refer to DTC Check/Clear.
Click here
| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 7. | CHECK VEHICLE CONTROL HISTORY* |
(a) Check for vehicle control history and note any codes that are output.
Click here
| 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 |
|
| 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 |
|
| 9. | OVERALL ANALYSIS AND TROUBLESHOOTING |
(a) Terminals of ECU
Click here
(b) Data List / Active Test
Click here
|
| 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 |
|
| 11. | PERFORM DCM ACTIVATION |
(a) Perform "DCM ACTIVATION".
Click here
|
| 12. | CONFIRMATION TEST |
| NEXT | | END |
READ NEXT:
Dcm Operation History
DCM OPERATION HISTORY HINT:
This function shows the telematics network status when the DCM (telematics transceiver) was operated. Use this when no DTC is present but this telematics system was unab
Dcm Activation
DCM ACTIVATION DCM ACTIVATION (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Choose "Telematics" from the System Selection Menu, and then cl
Acn Call End
ACN CALL END ACN CALL END This function terminates the ACN (Automatic Collision Notification) to the telematics provider. After a collision in which the DCM receives "Collision Detection Signal", the
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DIAGNOSIS SYSTEM DESCRIPTION The ECU stores DTCs when malfunctions occur. The diagnostic system allows for reading of the DTCs from the DLC3. Use the Techstream to check for malfunctions and perform repairs. CHECK DLC3 (a) Check the DLC3. Click here INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure t
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