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.

Fig 1: Identifying Electrical Terminals On Headlight Control Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.

Safety Warning

Headlight Control Relay

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?