Lexus ES: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), 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 | Proceed to "Wiper and Washer Switch Circuit" | |
| Windshield wiper motor assembly | | |
| Front wipers do not operate in INT | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in LO | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in HI | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in MIST | Proceed to "Wiper and Washer Switch Circuit" | |
| When the wiper switch is in INT, the front wiper intermittent operation interval cannot be adjusted by the windshield wiper switch assembly adjustment switch | Proceed to "Wiper and Washer Switch Circuit" | |
| Windshield wiper motor assembly | | |
| When the wiper switch is in INT, the front wiper intermittent operation interval does not change according to changes in the vehicle speed | Windshield wiper motor assembly | |
| Front wipers continuously operate in LO | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers continuously operate in HI | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers continuously operate in INT | Windshield wiper motor assembly | |
| "Wiper System Malfunction Visit Your Dealer" is displayed on the multi-information display | Windshield wiper motor assembly | |
| Main body ECU (Multiplex network body ECU) | | |
| Combination meter assembly | | |
| Front wipers do not move to the service position (wiper operation is normal) | Main body ECU (Multiplex network body ECU) | |
| Windshield washer motor and pump assembly does not operate | Proceed to "Washer Motor Circuit" | |
| Proceed to "Wiper and Washer Switch Circuit" | | |
| Washer fluid does not flow (Windshield washer motor and pump assembly is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position | Check the automatic stop (park) position | |
| Main body ECU (Multiplex network body ECU) | | |
| Front wipers did not operate before, but operate now | Check the Operation History | |
| Symptom | Suspected Area | Link |
|---|---|---|
| Front wipers do not operate at all | Proceed to "Wiper and Washer Switch Circuit" | |
| Windshield wiper motor assembly | | |
| Front wipers do not operate in AUTO | Check customize parameters (Auto wiper) | |
| Rain sensor tape (Check for air bubbles) | - | |
| Proceed to "Wiper and Washer Switch Circuit" | | |
| Rain sensor | | |
| Front wipers do not operate in INT* | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in LO | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in HI | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers do not operate in MIST | Proceed to "Wiper and Washer Switch Circuit" | |
| When the front wipers are operating in AUTO, the rain sensor sensitivity cannot be adjusted by the windshield wiper switch assembly (auto sensitivity adjustment switch) (wiping interval does not change) | Proceed to "Wiper and Washer Switch Circuit" | |
| Windshield wiper motor assembly | | |
| When the front wipers are operating in AUTO, the wiper interval does not change according to changes in the vehicle speed | Rain sensor | |
| Windshield wiper motor assembly | | |
| When the front wipers are operating in INT, the front wiper intermittent operation interval cannot be adjusted by the windshield wiper switch assembly (auto sensitivity adjustment switch) (wiping interval does not change)* | Proceed to "Wiper and Washer Switch Circuit" | |
| Windshield wiper motor assembly | | |
| When the front wipers are operating in INT, the front wiper intermittent operation interval does not change according to changes in the vehicle speed* | Windshield wiper motor assembly | |
| Front wipers continuously operate in AUTO | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers continuously operate in LO | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers continuously operate in HI | Proceed to "Wiper and Washer Switch Circuit" | |
| Front wipers continuously operate in INT* | Windshield wiper motor assembly | |
| When the front wipers are operating in AUTO, they do not stop operating when the driver door or front passenger door is opened | Proceed to "Front Door Courtesy Switch Circuit" | |
| Main body ECU (Multiplex network body ECU) | | |
| Windshield wiper motor assembly | | |
| "Wiper System Malfunction Visit Your Dealer" is displayed on the multi-information display | Windshield wiper motor assembly | |
| Main body ECU (Multiplex network body ECU) | | |
| Combination meter assembly | | |
| Front wipers do not move to the service position (wiper operation is normal) | Main body ECU (Multiplex network body ECU) | |
| When the customize setting "Auto Wiper" is changed, the operation of the wiper system does not change | Rain sensor | |
| Windshield washer motor and pump assembly does not operate | Proceed to "Washer Motor Circuit" | |
| Proceed to "Wiper and Washer Switch Circuit" | | |
| Washer fluid does not flow (Windshield washer motor and pump assembly is normal) | Washer fluid | - |
| Washer hose and nozzle | - | |
| When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position | Check the automatic stop (park) position | |
| Main body ECU (Multiplex network body ECU) | | |
| Front wipers did not operate before, but operate now | Check the Operation History | |
- *: When the customize setting "Auto Wiper" is set to "Not Avl".
| Symptom | Suspected Area | Link |
|---|---|---|
| "Windshield Washer Fluid Low" is displayed on the multi-information display when washer fluid level is not low | Proceed to "Washer Fluid Level Warning Switch Circuit" | |
| "Windshield Washer Fluid Low" is not displayed on the multi-information display when washer fluid level is low | Washer fluid | - |
| Proceed to "Washer Fluid Level Warning Switch Circuit" | |
READ NEXT:
Utility
UTILITY OPERATION HISTORY HINT: History of Reason for Operation: The windshield wiper motor assembly stores Operation History which can be read using the Techstream, when a malfunction of the wiper an
Terminals Of Ecu
TERMINALS OF ECU CHECK WINDSHIELD WIPER MOTOR ASSEMBLY (a) Disconnect the A38 windshield wiper motor assembly connector. (b) Measure the voltage and resistance on the wire harness side connector acco
Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / (desired system
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT FUEL SENDER GAUGE ASSEMBLY CAUTION: Perform the inspection in a well-ventilated area. Do not perform the inspection near an open flame. (a) Check that the float moves smoothly between F and E. (b) Check the fuel sender gauge assembly voltage. (1) Apply 5 V between
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) When troubleshooting a vehicle with the diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the multiplex tilt and telescopic ECU. The multiplex tilt and tele
