Trouble Shooting

Perform a visual inspection, checking for open fuses, disconnected or damaged wire harnesses and components. Repair or replace as necessary, and retest system operation. If no problems are found, diagnose system by symptom. See SYMPTOM INDEX table.

SYMPTOM INDEX

Problem

Inspect

Wipers & Washers Do Not Operate

WIPER Fuse
⁽¹⁾ Wiper/Washer Switch
⁽¹⁾ Wiper Motor
⁽²⁾ Body ECU

Wipers Do Not Operate In LO, HI Or MIST

⁽¹⁾ Wiper/Washer Switch
⁽¹⁾ Wiper Motor
⁽³⁾ Wiring Harness

Wipers Do Not Operate In INT

⁽¹⁾ Wiper/Washer Switch
⁽¹⁾ Wiper Motor
⁽²⁾ Body ECU
⁽³⁾ Wiring Harness

Washer Motor Does Not Operate

WASHER Fuse
⁽¹⁾ Wiper/Washer Switch
⁽¹⁾ Washer Motor
⁽³⁾ Wiring Harness

Wipers Do Not Operate When Washer Switch Is On

⁽¹⁾ Washer Motor
⁽²⁾ Body ECU
⁽³⁾ Wiring Harness

Washer Fluid Does Not Operate

Washer Hose & Nozzle

With Wiper Switch In HI Position, Wiper Blade Contacts Body

⁽¹⁾⁽⁴⁾ Wiper Motor
⁽³⁾⁽⁴⁾ Wiring Harness
⁽²⁾ Body Control ECU

With Wiper Switch In OFF Position, Wiper Blade Does Not Retract Or Position Is Incorrect

⁽¹⁾⁽⁴⁾ Wiper Motor
⁽³⁾⁽⁴⁾ Wiring Harness
⁽²⁾ Body ECU

⁽¹⁾	Perform appropriate circuit test under SYSTEM TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	Perform BODY ECU PIN VOLTAGE TESTS under COMPONENT TESTS in BODY CONTROL SYSTEMS - LS400 article.

⁽³⁾	Check wiring harness for opens or shorts. See WIRING DIAGRAMS . Repair or replace as necessary, and retest system operation.

⁽⁴⁾	Check wiper arm adjustment. See WIPER ARMS under ADJUSTMENTS.