Lexus NX: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use this procedure to troubleshoot the immobiliser 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 |
| 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, whether the hybrid control system was starting. |
| How did it happen? | Problem symptoms |
|
| 3. | INSPECT AUXILIARY BATTERY VOLTAGE |
(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.
HINT:
A simple method to determine whether the auxiliary battery is discharged is to operate the horn.
|
| 4. | TURN POWER SWITCH ON (IG) |
NOTICE:
When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
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| 5. | INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check for CAN communication system DTCs.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN DTCs are not output | A |
| CAN DTCs are output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 6. | INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check for LIN communication system DTCs.
Click here
| Result | Proceed to |
|---|---|
| LIN DTCs are not output | A |
| LIN DTCs are output | B |
| B | | GO TO LIN COMMUNICATION SYSTEM |
|
| 7. | CHECK FOR DTC* |
(a) Check for DTCs and make a note of any codes that are output.
Body Electrical > Smart Access > Trouble Codes Powertrain > Hybrid Control > Trouble Codes(b) Based on the DTCs output above, proceed to each diagnostic procedure.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| Hybrid control system DTCs are output | B |
| Steering lock system DTCs are output | C |
| Immobiliser system DTCs are output | D |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
| C | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
| D | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 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 |
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| 9. | OVERALL ANALYSIS AND TROUBLESHOOTING* |
(a) Data List / Active Test
Click here
(b) Terminals of ECU
Click here
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| 10. | REPAIR OR REPLACE |
HINT:
If the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU), steering lock ECU (steering lock actuator assembly), main body ECU (multiplex network body ECU), hybrid vehicle control ECU, or electrical key transmitter sub-assembly are replaced, refer to Registration.
Click here
|
| 11. | CHECK FOR DTC* |
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs Powertrain > Hybrid Control > Clear DTCs(b) Check for DTCs.
Body Electrical > Smart Access > Trouble Codes Powertrain > Hybrid Control > Trouble CodesHINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| Immobiliser system DTCs are output | B |
| A | | END |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
READ NEXT:
Registration
REGISTRATION PROCEDURE 1. INSTALL CAUTION REGARDING INTERFERENCE WITH ELECTRONIC DEVICES CAUTION:
People with implantable cardiac pacemakers, cardiac resynchronization therapy-pacemakers or implant
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
If the problem only occurs in certain locations or at certain times o
Terminals Of Ecu
TERMINALS OF ECU CHECK POWER SWITCH (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Input/Output Wiring Color Terminal Description
SEE MORE:
Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HORN RELAY ASSEMBLY (a) Remove the horn relay assembly. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Vo
PIG Power Supply Voltage (C1552,C1554)
DESCRIPTION When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note C1552 PIG Power Supply Voltage PIG
