Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Washer Fluid Level Warning Switch Circuit

DESCRIPTION

When the washer fluid level is lower than a certain level, a warning message is displayed on the combination meter assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of circuits related to this system before performing the following procedure.

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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Washer Switch

Washer fluid level warning switch

ON or OFF

ON: Washer fluid level low

OFF: Washer fluid level not low

-

Body Electrical > Combination Meter > Data List

Tester Display

Washer Switch

OK:

The Techstream display changes correctly in response to the washer fluid level.

OK

GO TO METER / GAUGE SYSTEM

NG

2.

CHECK HARNESS AND CONNECTOR (LEVEL WARNING SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the A59 level warning switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A59-1 (S) - Body ground

Engine switch off

Below 1 V

A59-1 (S) - Body ground

Engine switch on (IG)

11 to 14 V

NG

GO TO STEP 4

OK

3.

CHECK HARNESS AND CONNECTOR (LEVEL WARNING SWITCH ASSEMBLY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A59-2 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE LEVEL WARNING SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (WASHER MOTOR AND PUMP ASSEMBLY - WINDSHIELD WIPER SWITCH ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A59-1 (S) - J10-16 (WLVL)

Always

Below 1 Ω

A59-1 (S) or J10-16 (WLVL) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    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 ...

    Wiper Switch
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