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 |
|---|---|---|
| All doors lock/unlock functions do not operate via door control switch or door key cylinder. | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch or Door Key Cylinder" | |
| All doors lock/unlock functions do not operate via door control switch. | Proceed to "All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch" | |
| All doors lock function do not operate via door control switch and door key cylinder. | Instrument panel junction block assembly | |
| Main body ECU (Multiplex network body ECU) | | |
| All doors unlock function do not operate via door control switch and door key cylinder. | Instrument panel junction block assembly | |
| Main body ECU (Multiplex network body ECU) | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Only driver door lock/unlock functions do not operate. | Front door lock assembly LH | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Only driver door unlock function does not operate (lock function operates). | Instrument panel junction block assembly | |
| Main body ECU (Multiplex network body ECU) | | |
| Only front passenger door lock/unlock functions do not operate. | Front door lock assembly RH | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Only rear door LH lock/unlock functions do not operate. | Rear door lock assembly LH | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Only rear door RH lock/unlock functions do not operate. | Rear door lock assembly RH | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Only back door open function does not operate*1. | Power Back Door System | |
| Only back door open function does not operate*2. | Proceed to "Only Back Door cannot be Opened" | |
- *1: w/ Power Back Door System
- *2: w/o Power Back Door System
| Symptom | Suspected Area | Link |
|---|---|---|
| Speed-sensitive automatic door lock function does not operate (meter/gauge system operates normally). | CAN communication system | |
| Main body ECU (Multiplex network body ECU) | | |
| Shift-linked automatic door lock/unlock functions do not operate (transaxle hybrid transmission system operates normally). | CAN communication system | |
| Main body ECU (Multiplex network body ECU) | | |
| Hybrid vehicle control ECU | | |
| Key lock-in prevention function does not operate. | Proceed to "Room Oscillator does not Recognize Key" | |
| Front door courtesy light switch assembly LH | | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Main body ECU (Multiplex network body ECU) | | |
| Lock operation continues even after doors have been locked* | Front door lock assembly LH | |
| Front door lock assembly RH | | |
| Rear door lock assembly LH | | |
| Rear door lock assembly RH | | |
| Harness or connector | - | |
| Instrument panel junction block assembly | | |
| Main body ECU (Multiplex network body ECU) | | |
| Only remote door LOCK/UNLOCK functions do not operate (power door lock operation is normally) (w/ LEXUS ENFORM Remote) | Telematics system | |
- *: When the door unlock detection switch detects an unlock position signal after a door lock operation has been performed, a door lock operation will be performed 3 times.
READ NEXT:
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 CHECK DLC3 (a) Check the DLC3. Click here INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage. Standard voltage: 11 to 14 V (power switch off) If the voltag
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 / Main Body / Trouble
SEE MORE:
Driver Side Door Entry Unlock Function does not Operate
DESCRIPTION If the entry unlock function does not operate for the driver door only, but the entry lock function operates, the request code is being transmitted properly from the driver door. In this case, there may be a problem related to the unlock sensor (connection between the certification ECU (
System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU Receiving ECU Signal Communication Method Multiplex Network Master Switch Assembly Front Power Window Regulator Motor Assembly LH Power window auto up and down signal LIN
Front Power Window Regulator Motor Assembly RH
