Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
If the main body ECU (multiplex network body ECU) is replaced, refer to the Smart Access System with Push-button Start (for Entry Function).
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HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Wireless control function and entry function do not operate | Proceed to "All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate" | |
| Wireless control function does not operate but entry function operates | Electrical key transmitter sub-assembly | - |
| Only answer-back function does not operate properly | Proceed to "No answer-back" | |
| Only automatic lock function does not operate properly | Perform operation check | |
| Proceed to "Door Courtesy Switch Circuit" | | |
| Main body ECU (Multiplex network body ECU) | | |
| Only illuminated entry function does not operate | Perform operation check | |
| Lighting system | | |
| Only door ajar warning function does not operate | Perform operation check | |
| Proceed to "Door Courtesy Switch Circuit" | | |
| Wireless door lock buzzer | | |
| Only panic alarm function does not operate | Perform operation check | |
| Theft deterrent system | |
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Terminals Of Ecu
TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *1 Main Body ECU (Multiplex Network Body ECU) - - (a) Remove the main body E
Diagnosis System
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 r
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Access / Troub
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Precaution
PRECAUTION PRECAUTION FOR SERVICING VEHICLE (a) After ECUs or parts are removed and installed, or replaced during inspection or servicing the vehicle, it is necessary to perform certain procedures (adjustment, calibration, initialization or registration). Click here PRECAUTION FOR TROUBLESHOOTING
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) Headlight ECU sub-assembly (1) The headlight ECU sub-assembly stops light operation if the following malfunctions are detected. Malfunction Multi-information Display Warning DTC Output Lighting on/off LED light source malfunction Low beam Displ
