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 |
|---|---|---|
| Front wipers do not operate at all | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Front wipers do not operate in AUTO | LIN communication system | |
| Windshield wiper switch assembly | | |
| Map light assembly | | |
| Rain sensor tape (Make sure there are no air bubbles.) | - | |
| Rain sensor | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| When the front wiper switch is in AUTO, the rain sensor sensitivity cannot be adjusted by the windshield wiper switch assembly adjusting ring | Windshield glass (Rain sensor sensing portion) is dirty | - |
| Rain sensor tape (Make sure there are no air bubbles.) | - | |
| Rain sensor | | |
| Windshield wiper switch assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| When the front wipers operate in AUTO, the wiping interval does not change according to changes in the vehicle speed | Meter / gauge system | |
| Windshield wiper switch assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Front wipers do not operate in HI | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Front wipers do not operate in LO or MIST | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Front wipers do not operate when the washer fluid is sprayed with the washer switch on | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Only front washer does not operate | Windshield wiper switch assembly | |
| Windshield washer motor and pump assembly | | |
| Windshield wiper relay assembly | | |
| Harness or connector | - | |
| Washer fluid does not flow (Washer motor is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Front wiper arms do not return to their original positions when wiper switch is turned off | Front wiper arm installation position | |
| Windshield wiper switch assembly | | |
| Windshield wiper motor assembly | | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Front wipers do not operate at all | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Harness or connector | - | |
| Front wipers do not operate in INT | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Harness or connector | - | |
| Front wipers do not operate in LO, MIST or HI | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Harness or connector | - | |
| When the wiper switch is in INT, the front wiper intermittent operation timing does not change (Intermittent operation is normal) | Windshield wiper switch assembly | |
| Front wipers do not operate when the washer fluid is sprayed with the washer switch on | Windshield wiper switch assembly | |
| Windshield wiper motor assembly | | |
| Harness or connector | ||
| Only front washer does not operate | Windshield wiper switch assembly | |
| Windshield washer motor and pump assembly | | |
| Harness or connector | - | |
| Washer fluid does not flow (Washer motor is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Front wiper arms do not return to their original positions when wiper switch is turned off | Front wiper arm installation position | |
| Windshield wiper switch assembly | | |
| Windshield wiper motor assembly | | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Rear wiper does not operate at all | Windshield wiper switch assembly | |
| Rear wiper motor assembly | | |
| Harness or connector | - | |
| Rear wiper does not operate in ON or INT | Windshield wiper switch assembly | |
| Rear wiper motor assembly | | |
| Harness or connector | - | |
| Rear wiper does not operate when the washer fluid is sprayed with the rear washer switch on | Windshield wiper switch assembly | |
| Rear wiper motor assembly | | |
| Harness or connector | - | |
| Only rear washer does not operate | Windshield wiper switch assembly | |
| Windshield washer motor and pump assembly | | |
| Harness or connector | - | |
| Washer fluid does not flow (Washer motor is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Rear wiper arm does not return to its original position when wiper switch is turned off | Rear wiper arm installation position | |
| Windshield wiper switch assembly | | |
| Rear wiper motor assembly | | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Headlight cleaner system does not operate (for Triple Beam Headlight) | Lighting system | |
| Check headlight cleaner washer nozzle cover | - | |
| Check headlight cleaner hose | - | |
| Proceed to "Headlight Cleaner Motor and Relay Circuit" | | |
| Headlight cleaner system does not operate (for Single Beam Headlight) | Lighting system | |
| Check headlight cleaner washer nozzle cover | - | |
| Check headlight cleaner hose | - | |
| Headlight cleaner motor and pump assembly | | |
| Headlight cleaner control relay | | |
| Instrument panel junction block assembly | | |
| Main body ECU (multiplex network body ECU) | | |
| Harness or connector | - |
| Symptom | Suspected Area | Link |
|---|---|---|
| Washer fluid level warning system does not operate | Proceed to "Washer Fluid Level Warning Switch Circuit" | |
READ NEXT:
Terminals Of Ecu
TERMINALS OF ECU CHECK WINDSHIELD WIPER RELAY ASSEMBLY (w/ Rain Sensor) (a) Disconnect the I56 windshield wiper relay assembly connector. (b) Measure the voltage and resistance according to the value
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (w/ Rain Sensor) (a) When the windshield wiper switch assembly is in the AUTO position and any of the following conditions are met, intermittent operation according
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Th
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