System Operation Check

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

Trouble shooting of wiper/washer system complaint begins with verification of the customer problem. If problem occurs, go to step 3. If problem does not occur, go to next step.
If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.

Determine problem symptom. See PROBLEM SYMPTOM INDEX table.

PROBLEM SYMPTOM INDEX

Symptom

Suspected Area ⁽¹⁾

Wiper & Washers Do Not Operate

⁽²⁾⁽³⁾⁽⁴⁾⁽⁵⁾⁽⁶⁾

Wipers Do Not Operate In LO, HI Or MIST

⁽³⁾⁽⁴⁾⁽⁶⁾

Wipers Do Not Operate In INT

⁽³⁾⁽⁴⁾⁽⁵⁾⁽⁶⁾

Washer Motor Does Not Operate

⁽³⁾⁽⁷⁾⁽⁶⁾

Wipers Do Not Operate With Washer Switch In ON

⁽⁷⁾⁽⁵⁾⁽⁶⁾

Washer Fluid Does Not Operate

⁽⁸⁾

When Wiper Switch Is At HI Position, Wiper Blade Is In Contact With Body &/Or When Wiper Switch Is OFF, Wiper Blade Does Not Retract Or Retract Position Is Wrong

⁽⁹⁾⁽¹⁰⁾⁽⁵⁾

⁽¹⁾	Perform test procedures in order listed under suspected area.

⁽²⁾	Check the WIPER fuse located in the instrument panel junction block.

⁽³⁾	Check the appropriate wiper/washer switch. See FRONT WIPER & WASHER SWITCH or REAR WIPER & WASHER SWITCH under COMPONENT TESTS.

⁽⁴⁾	Check the appropriate wiper motor. See FRONT WIPER MOTOR or REAR WIPER MOTOR under COMPONENT TESTS.

⁽⁵⁾	Check the body ECU. See BODY CONTROL SYSTEM article.

⁽⁶⁾	Check the wire harness.

⁽⁷⁾	Check the appropriate washer motor. See FRONT WASHER MOTOR or REAR WASHER MOTOR under COMPONENT TESTS.

⁽⁸⁾	Check the washer hose and nozzle.

⁽⁹⁾	Check the appropriate wiper motor. See FRONT WIPER MOTOR or REAR WIPER MOTOR under COMPONENT TESTS. Inspect the wiper arm and blade set position.

⁽¹⁰⁾	Check the wire harness. Inspect the wiper arm and blade set position.

Inspect the wiper/washer circuits. See CIRCUIT TESTS .
After problem has been identified and repaired, confirm repairs. After repairs have been completed, confirm that problem has been eliminated. Operate system under same conditions recorded for original complaint. If problem is no longer present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.