Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Washer Motor Circuit
DESCRIPTION
When the washer motor and pump assembly receives signals from the windshield wiper switch assembly it operates to spray washer fluid from the washer nozzle sub-assemblies.
WIRING DIAGRAM
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(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 / Wiper / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Wiper > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Washer Switch | Washer switch ON position signal | ON or OFF | ON: Front washer switch in ON position OFF: Front washer switch not in ON position | - |
| Tester Display |
|---|
| Washer Switch |
OK:
The Techstream display changes correctly in response to the front washer switch operation.
| NG | .gif) | REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY |
|
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| 2. | INSPECT WASHER MOTOR AND PUMP ASSEMBLY |
(a) Inspect the washer motor and pump assembly.
Click here .gif)
| NG | | REPLACE WASHER MOTOR AND PUMP ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (WASHER MOTOR AND PUMP ASSEMBLY - WINDSHIELD WIPER SWITCH ASSEMBLY) |
(a) Disconnect the A34 washer motor and pump assembly connector.
(b) Disconnect the J31 windshield wiper switch assembly connector.
(c) Disconnect the J33 windshield wiper switch assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J31-5 (WR) - A34-1 | Always | Below 1 Ω |
| J33-7 (WF) - A34-2 | Always | Below 1 Ω |
| J31-5 (WR) or A34-1 - Body ground | Always | 10 kΩ or higher |
| J33-7 (WF) or A34-2 - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Headlight Cleaner Motor and Relay Circuit
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Washer Fluid Level Warning Switch Circuit
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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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