Wiper Switch

WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

Check the continuity of each terminal of the wiper switch assembly connector. See INSPECTING FRONT WIPER/WASHER SWITCH CONTINUITY . See Figure.

INSPECTING FRONT WIPER/WASHER SWITCH CONTINUITY

Switch Position

Tester Connection

Specified Condition

Front Wiper Switch

MIST

7 (+1) - 17 (+B)

Continuity

OFF

16 (+S) - 7 (+1)

Continuity

INT ⁽¹⁾

16 (+S) - 7 (+1)

Continuity

AUTO ⁽²⁾

16 (+S) - 7 (+1), 4 (AUTO) - 14 (E)

Continuity

7 (+1) - 17 (+B)

Continuity

17 (+B) - 8 (+2)

Continuity

Front Washer Switch

OFF

.....

No Continuity

11 (WF) - 2 (EW)

Continuity

⁽¹⁾	Without AUTO wiper system.

⁽²⁾	With AUTO wiper system.

Check the intermittent operation as follows. Connect the voltmeter (+) terminal to terminal No. 7 (+1) of the connector, the voltmeter (-) terminal to terminal No. 2 (EW) of the connector. Connect the battery (+) to terminal No. 17 (+B) of the connector, the battery (-) to terminals No. 2 (EW) and 16 (+S) of the connector. Turn the wiper switch to INT. Connect the battery (+) to terminal No. 16 (+S) of the connector for 5 seconds. Connect the battery (-) to terminal No. 16 (+S) of the connector. Voltage should be as shown in illustration. See Fig 1.
Check the front wiper operation as follows. Turn the wiper switch to OFF. Connect the battery (+) to terminal No. 17 (+B) of the connector, the battery (-) to terminal No. 16 (+S) and 2 (EW) to the connector. Connect the voltmeter (+) terminal to terminal No. 7 (+1) of the connector and the voltmeter (-) terminal to terminal No. 2 (EW) of the connector. Turn the washer switch to ON and OFF. Voltage should be as shown in illustration. See Fig 2.

Fig 1: Inspecting Intermittent Wiper Relay Voltage

Fig 2: Inspecting Front Wiper Switch Voltage