Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
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.
Front Wiper and Washer (w/ Auto Wiper System)| Symptom | Suspected Area | Link |
|---|---|---|
| Front wipers do not operate at all | Perform Active Test (Wiper Motor LO and Wiper Motor HI) | |
| Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch AUTO, Wiper Switch MIST, Wiper Stop Request, Ignition Switch and Remote Engine Starter Control) | | |
| Proceed to "Wiper Motor Power Source Circuit" | | |
| Front wiper motor and link assembly | | |
| Wire harness or connector (windshield wiper switch assembly - front wiper motor and link assembly) | - | |
| Windshield wiper switch assembly | | |
| Wiper motor wire | | |
| Front wiper motor and link assembly | | |
| Main body ECU (multiplex network body ECU) | | |
| Wire harness or connector | - | |
| Front wipers do not operate in AUTO | Read Data List (Wiper Switch AUTO, Wiper Stop Request, Wiping Mode Signal (Sensor to Wiper) and Wiping Mode Signal (Wiper to Sensor)) | |
| Wire harness or connector (windshield wiper switch assembly - front wiper motor and link assembly - rain sensor) | - | |
| Windshield wiper switch assembly | | |
| Rain sensor tape (Check for air bubbles) | - | |
| Rain sensor | | |
| Main body ECU (multiplex network body ECU) | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in LO | Read Data List (Wiper Switch LO) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in HI | Read Data List (Wiper Switch HI) | |
| Front wiper motor and link assembly | | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in MIST | Read Data List (Wiper Switch MIST) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the front wipers are operating in AUTO, the rain sensor sensitivity cannot be adjusted by the windshield wiper switch assembly adjustment switch | Read Data List (Intermittent Time Volume, Switch AUTO, Vehicle Speed, Wiping Mode Signal (Sensor to Wiper) and Wiping Mode Signal (Wiper to Sensor)) | |
| Windshield wiper switch assembly | | |
| Rain sensor tape (Check for air bubbles) | - | |
| Rain sensor | | |
| Front wiper motor and link assembly | | |
| When the front wipers operate in AUTO, the wiper interval does not change according to changes in the vehicle speed | Read Data List (Intermittent Time Volume, Vehicle Speed, Wiping Mode Signal (Sensor to Wiper) and Wiping Mode Signal (Wiper to Sensor)) | |
| Rain sensor tape (Check for air bubbles) | - | |
| Rain sensor | | |
| Main body ECU (multiplex network body ECU) | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in INT* | Read Data List (Wiper Switch INT) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the wiper switch is in INT, the front wiper intermittent operation interval cannot be adjusted by the windshield wiper switch assembly adjustment switch | Read Data List (Intermittent Time Volume) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the wiper switch is in INT, the front wiper intermittent operation interval does not change according to changes in the vehicle speed | Read Data List (Vehicle Speed) | |
| Main body ECU (multiplex network body ECU) | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in AUTO | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch AUTO, Wiper Switch MIST and Wiper Switch INT) | |
| Rain sensor | | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in LO | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch AUTO, Wiper Switch MIST and Wiper Switch INT) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in HI | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch AUTO, Wiper Switch MIST, Wiper Switch INT and Wiper Switch HI (Line)) | |
| Wire harness or connector (windshield wiper switch assembly - front wiper motor and link assembly) | - | |
| Windshield wiper switch assembly | | |
| Wiper motor wire | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in INT* | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch AUTO, Wiper Switch MIST and Wiper Switch INT) | |
| Rain sensor tape (Check for air bubbles) | - | |
| Rain sensor | | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the front wipers are operating in AUTO, the front wipers do not stop operating when the driver door or front passenger door is opened | Main body ECU (multiplex network body ECU) | |
| Rain sensor | | |
| Front wiper motor and link assembly | | |
| "Wiper System Malfunction Visit Your Dealer" is displayed on the multi-information display | Front wiper motor and link assembly | |
| Main body ECU (multiplex network body ECU) | | |
| Combination meter assembly | | |
| Front wipers do not move to the service position | Read Data List (Wiper Switch MIST and Ignition Switch) | |
| Front wiper motor and link assembly | | |
| When the setting of the customize setting "Auto Wiper" is changed, the operation of the wiper system does not change. | Rain sensor | |
| Washer motor and pump assembly does not operate | Proceed to "Washer motor circuit" | |
| Washer fluid does not flow (Washer motor and pump assembly is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Front wipers do not operate when the front washer switch is on | Front wiper motor and link assembly | |
| Windshield wiper switch assembly | | |
| When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position | Front wiper motor and link assembly | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | |
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- *: When the customize setting "Auto Wiper" is set to "Not Avl".
| Symptom | Suspected Area | Link |
|---|---|---|
| Front wipers do not operate at all | Perform Active Test (Wiper Motor LO and Wiper Motor HI) | |
| Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch MIST, Wiper Stop Request, Ignition Switch and Remote Engine Starter Control) | | |
| Proceed to "Wiper Motor Power Source Circuit" | | |
| Front wiper motor and link assembly | | |
| Wire harness or connector (windshield wiper switch assembly - front wiper motor and link assembly) | - | |
| Windshield wiper switch assembly | | |
| Wiper motor wire | | |
| Front wiper motor and link assembly | | |
| Main body ECU (multiplex network body ECU) | | |
| Wire harness or connector | - | |
| Front wipers do not operate in LO | Read Data List (Wiper Switch LO) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in HI | Read Data List (Wiper Switch HI) | |
| Front wiper motor and link assembly | | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in MIST | Read Data List (Wiper Switch MIST) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers do not operate in INT | Read Data List (Wiper Switch INT) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the wiper switch is in INT, the front wiper intermittent operation interval cannot be adjusted by the windshield wiper switch assembly adjustment switch* | Read Data List (Intermittent Time Volume) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| When the wiper switch is in INT, the front wiper intermittent operation interval does not change according to changes in the vehicle speed* | Read Data List (Vehicle Speed) | |
| Main body ECU (multiplex network body ECU) | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in LO | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch MIST and Wiper Switch INT) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in HI | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch MIST, Wiper Switch INT and Wiper Switch HI (Line)) | |
| Wire harness or connector (windshield wiper switch assembly - front wiper motor and link assembly) | - | |
| Windshield wiper switch assembly | | |
| Wiper motor wire | | |
| Front wiper motor and link assembly | | |
| Front wipers continuously operate in INT | Read Data List (Wiper Switch LO, Wiper Switch HI, Wiper Switch MIST and Wiper Switch INT) | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | | |
| "Wiper System Malfunction Visit Your Dealer" is displayed on the multi-information display | Front wiper motor and link assembly | |
| Main body ECU (multiplex network body ECU) | | |
| Combination meter assembly | | |
| Front wipers do not move to the service position | Read Data List (Wiper Switch MIST and Ignition Switch) | |
| Front wiper motor and link assembly | | |
| Washer motor and pump assembly does not operate | Proceed to "Washer motor circuit" | |
| Washer fluid does not flow (Washer motor and pump assembly is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Front wipers do not operate when the front washer switch is on | Front wiper motor and link assembly | |
| Windshield wiper switch assembly | | |
| When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position | Front wiper motor and link assembly | |
| Windshield wiper switch assembly | | |
| Front wiper motor and link assembly | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Rear wiper does not operate at all | Windshield wiper switch assembly | |
| Rear wiper motor and bracket assembly | | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| Rear wiper does not operate in INT | Windshield wiper switch assembly | |
| Rear wiper motor and bracket assembly | | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| Rear wiper does not operate in LO | Windshield wiper switch assembly | |
| Rear wiper motor and bracket assembly | | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| Rear wiper continuously operate in INT | Windshield wiper switch assembly | |
| Rear wiper motor and bracket assembly | | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| Rear wiper continuously operates in LO | Windshield wiper switch assembly | |
| Rear wiper motor and bracket assembly | | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| Rear washer motor and pump assembly does not operate | Proceed to "Washer motor circuit" | |
| Windshield wiper switch assembly | | |
| Washer motor and pump assembly | | |
| Washer fluid does not flow (Rear washer motor and pump assembly is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| Rear wiper does not operate when the rear washer switch is on | Windshield wiper switch assembly | |
| Wire harness or connector (windshield wiper switch assembly - rear wiper motor and bracket assembly) | - | |
| When the rear wiper switch is turned off, the rear wiper does not stop (park) or stops (parks) in the wrong position | Rear wiper motor and bracket assembly | |
| Windshield wiper switch assembly | | |
| Rear wiper motor and bracket assembly | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Headlight cleaner system does not operate when the front washer switch is operated (Washer motor and pump assembly is normal) | Proceed to "Headlight Cleaner Motor and Relay Circuit" | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Washer fluid level warning message on the multi-information display does not operate | Washer fluid | - |
| Proceed to "Washer Fluid Level Warning Switch Circuit" | |
Customize Parameters
CUSTOMIZE PARAMETERS RAIN SENSOR CUSTOMIZE (w/ Auto wiper system) (a) Customizing with the Techstream (1) Connect the Techstream to the DLC3. (2) Turn the engine switch on (IG). (3) Turn the Techstrea ...
Terminals Of Ecu
TERMINALS OF ECU CHECK WINDSHIELD WIPER MOTOR ASSEMBLY (a) Disconnect the i1 windshield wiper motor assembly connector. (b) Measure the voltage and resistance on the wire harness side connector accor ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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