Toyota Tundra Service Manual: Washer Fluid Level Warning Switch Circuit

Toyota Tundra Service Manual / Vehicle Interior / Wiper / Washer / Wiper And Washer System / Washer Fluid Level Warning Switch Circuit

DESCRIPTION

When the volume of washer fluid decreases below a certain level (when the washer fluid level warning switch is turned ON), the combination meter warns the driver through the warning message on the combination meter.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (WASHER FLUID LEVEL WARNING SWITCH)

(a) Check the Data List for proper functioning of the washer fluid level warning switch.

Combination Meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Washer Switch

Washer fluid level warning switch / ON or OFF

ON: Washer jar is empty

OFF: Washer jar is full

-

OK:

On screen, each item changes between ON and OFF according to above chart.

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK WASHER FLUID LEVEL WARNING SWITCH ASSEMBLY

(a) Disconnect the A27 switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A27-1 (S) - A27-2 (E)

Washer jar is empty

Below 5.5 Ω

A27-1 (S) - A27-2 (E)

Washer jar is full

10 kΩ or higher

NG

REPLACE WASHER FLUID LEVEL WARNING SWITCH ASSEMBLY

OK

3.

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

(a) Disconnect the A27 switch connector.

(b) Disconnect the J28 meter connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A27-1 (S) - J28-15 (WLVL)

Always

Below 1 Ω

A27-2 (E) - Body ground

Always

Below 1 Ω

A27-1 (S) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    System Diagram

    Wiper Switch

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