Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 136 (WIPER/WASHER SYSTEMS)TROUBLE SHOOTINGSYSTEM OPERATION CHECK
2004 Toyota Celica GT, Standard
System Operation Check
2004 Toyota Celica GT, StandardSECTION System Operation Check
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.
- Trouble shooting of a wiper/washer system complaint begins with verification of the customer problem. If problem occurs, go to step 4. 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. If problem still cannot be created, go to next step.
- Perform pre-check.
- Check the rain drop sensing wiper operation. Check that the wiper operates properly in INT, LO and HI mode depending on the amount of rain drops on the windshield glass when the wiper switch is on AUTO.
- Check the fail safe function. Check that the wiper operates intermittently depending on the sensitivity control position in the wiper switch AUTO on the following condition: rain sensor temperature is less than 14°F (-10°C), the rain sensor temperature is more than 176°F (80°C) or the rain sensor malfunctions.
- If wiper system does not operate properly, diagnose by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- Perform check of the terminals of the ECU. See TERMINALS OF ECU under COMPONENT TESTS.
- After problem has been identified and repaired or replaced, 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 and no DTCs are present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.