Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
- Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
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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 |
|---|---|---|
| Driver side power window does not operate with power window master switch | Proceed to "Driver Side Power Window does not Operate with Power Window Master Switch" | |
| Front passenger side power window does not operate with front passenger side power window switch | Proceed to "Front Passenger Side Power Window does not Operate with Front Passenger Side Power Window Switch" | |
| Rear power window LH does not operate with rear power window switch LH | Proceed to "Rear Power Window LH does not Operate with Rear Power Window Switch LH" | |
| Rear power window RH does not operate with rear power window switch RH | Proceed to "Rear Power Window RH does not Operate with Rear Power Window Switch RH" | |
| Power windows do not operate using all window switch | Main body ECU (multiplex network body ECU) | |
| Power window inching function operates during driver side power window up operation (approximately 0.4 seconds) | Front power window regulator motor assembly LH | |
| Power window inching function operates during front passenger side power window up operation (approximately 0.4 seconds) | Front power window regulator motor assembly RH | |
| Power window inching function operates during rear power window RH up operation (approximately 0.4 seconds) | Rear power window regulator motor assembly RH | |
| Power window inching function operates during rear power window LH up operation (approximately 0.4 seconds) | Rear power window regulator motor assembly LH | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Driver side power window auto up / down function does not operate with power window master switch (manual up / down function is normal) | Proceed to "Driver Side Power Window Auto Up / Down Function does not Operate with Power Window Master Switch" | |
| Front passenger side power window auto up / down function does not operate with front passenger side power window switch (manual up / down function is normal) | Proceed to "Front Passenger Side Power Window Auto Up / Down Function does not Operate with Front Passenger Side Power Window Switch" | |
| Rear power window LH auto up / down function does not operate with rear power window switch LH (manual up / down function is normal) | Proceed to "Rear Power Window LH Auto Up / Down Function does not Operate with Rear Power Window Switch LH" | |
| Rear power window RH auto up / down function does not operate with rear power window switch RH (manual up / down function is normal) | Proceed to "Rear Power Window RH Auto Up / Down Function does not Operate with Rear Power Window Switch RH" | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Remote up / down function does not operate | Proceed to "Remote Up / Down Function does not Operate" | |
| Symptom | Suspected Area | Link |
|---|---|---|
| All power windows do not operate with driver side door key cylinder or wireless transmitter | Proceed to "All Power Windows do not Operate with Driver Side Door Key Cylinder or Wireless Transmitter" | |
| Key-off operation function operates even if operating conditions are not satisfied | Proceed to "Key-off Operation Function Operates even if Operating Conditions are not Satisfied" | |
| Auto up operation does not fully close power window (jam protection function is activated) | Proceed to "Auto Up Operation does not Fully Close Power Window (Jam Protection Function is Activated)" | |
| Auto down operation does not fully open power window (catch protection function is activated) | Proceed to "Auto Down Operation does not Fully Open Power Window (Catch Protection Function is Activated)" | |
| Jam protection function does not operate | Proceed to "Jam Protection Function does not Operate" | |
READ NEXT:
Terminals Of Ecu
TERMINALS OF ECU CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY (a) Disconnect the M10 multiplex network master switch assembly connector. (b) Measure the voltage and resistance according to the valu
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Body El
Fail-safe Chart
FAIL-SAFE CHART PULSE FAILURE (a) If the pulse sensor malfunctions, the following power window operations are prohibited. Multiplex Network Master Switch Assembly, Power Window Regulator Switch Assemb
SEE MORE:
Side Camera Feedback Malfunction (C1683)
DESCRIPTION This DTC is stored if the parking assist ECU judges as a result of its self check that a synchronization problem is occurring in the image signal sent from the passenger side television camera assembly to the parking assist ECU. DTC No. Detection Item DTC Detection Condition Tro
Abnormal Leak in Accumulator (C1391)
DESCRIPTION This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake actuator (brake booster with master cylinder assembly) or brake booster pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking. DTC
