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Home >> Lexus >> 2021 >> NX 300 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System / Washer System - Diagnostics & Circuit Tests >> Wiper And Washer System >> Problem Symptoms Table [10/2014 - 09/2017] >> Problem Symptoms Table [10/2014 - 09/2017]
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Problem Symptoms Table [10/2014 - 09/2017]

NOTE:
  • 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.

    Refer to REGISTRATION [10/2014 - 05/2019]

HINT: 

FRONT WIPER AND WASHER SYSTEM (W/ RAIN SENSOR)

Symptom Suspected Area Link
Front wipers do not operate at all Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
Front wipers do not operate in AUTO LIN communication system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Map light assembly Refer to INSPECTION [10/2014 - ]
Rain sensor tape (Make sure there are no air bubbles.) -
Rain sensor Refer to ON-VEHICLE INSPECTION [10/2014 - 09/2017]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
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 Refer to ON-VEHICLE INSPECTION [10/2014 - 09/2017]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
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 Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
Front wipers do not operate in HI Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
Front wipers do not operate in LO or MIST Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
Front wipers do not operate when the washer fluid is sprayed with the washer switch on Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
Only front washer does not operate Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield washer motor and pump assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper relay assembly Refer to REMOVAL [10/2014 - 05/2019]
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 Refer to ON-VEHICLE INSPECTION [10/2014 - ]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
FRONT WIPER AND WASHER SYSTEM (W/O RAIN SENSOR)

Symptom Suspected Area Link
Front wipers do not operate at all Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
Front wipers do not operate in INT Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
Front wipers do not operate in LO, MIST or HI Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
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 Refer to INSPECTION [10/2014 - ]
Front wipers do not operate when the washer fluid is sprayed with the washer switch on Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector  
Only front washer does not operate Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield washer motor and pump assembly Refer to INSPECTION [10/2014 - ]
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 Refer to ON-VEHICLE INSPECTION [10/2014 - ]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
REAR WIPER AND WASHER SYSTEM

Symptom Suspected Area Link
Rear wiper does not operate at all Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Rear wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
Rear wiper does not operate in ON or INT Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Rear wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
Rear wiper does not operate when the washer fluid is sprayed with the rear washer switch on Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Rear wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
Only rear washer does not operate Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Windshield washer motor and pump assembly Refer to INSPECTION [10/2014 - ]
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 Refer to ON-VEHICLE INSPECTION [10/2014 - ]
Windshield wiper switch assembly Refer to INSPECTION [10/2014 - ]
Rear wiper motor assembly Refer to INSPECTION [10/2014 - ]
Harness or connector -
HEADLIGHT CLEANER SYSTEM (W/ HEADLIGHT CLEANER SYSTEM)

Symptom Suspected Area Link
Headlight cleaner system does not operate (for Triple Beam Headlight) Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017]
Check headlight cleaner washer nozzle cover -
Check headlight cleaner hose -
Proceed to "Headlight Cleaner Motor and Relay Circuit" Refer to Headlight Cleaner Motor and Relay Circuit [10/2014 - 09/2017] 
Headlight cleaner system does not operate (for Single Beam Headlight) Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017]
Check headlight cleaner washer nozzle cover -
Check headlight cleaner hose -
Headlight cleaner motor and pump assembly Refer to INSPECTION [10/2014 - ]
Headlight cleaner control relay Refer to ON-VEHICLE INSPECTION [10/2014 - ]
Instrument panel junction block assembly Refer to REMOVAL [10/2014 - 05/2019]
Main body ECU (multiplex network body ECU) Refer to REMOVAL [10/2014 - 05/2019]
Harness or connector -
WASHER FLUID LEVEL WARNING SYSTEM

Symptom Suspected Area Link
Washer fluid level warning system does not operate Proceed to "Washer Fluid Level Warning Switch Circuit" Refer to Washer Fluid Level Warning Switch Circuit [10/2014 - ]