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 130 (BODY CONTROL SYSTEMS)COMPONENT TESTSHEADLIGHT CONTROL RELAY
2004 Toyota Celica GT, Standard
Headlight Control Relay
2004 Toyota Celica GT, StandardSECTION Headlight Control Relay
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Headlight control relay may also be referred to as head relay.
- Turn ignition off. Remove headlight control relay. Headlight control relay is located in engine compartment junction block at left side of engine compartment, in front of shock tower.
- Note identification of electrical terminals on headlight control relay. See Fig 1. Using ohmmeter, check that no continuity exists between terminals No. 1 and 2 on headlight control relay and that continuity exists between terminals No. 3 and 4 on headlight control relay.
- Using jumper wires, apply battery voltage and ground to terminals No. 3 and 4 on headlight control relay. Check that continuity now exists between terminals No. 1 and 2 on headlight control relay. See Fig 1. If continuity is not as specified, replace headlight control relay.
RENDER: 1.0x
NO RELATED
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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.