Toyota Corolla Head Light Relay

22 Aug 2014 | Author: | Comments Off on Toyota Corolla Head Light Relay

Questions and Answers

Toyota Corolla Head Light Relay

Q. Hello Mr. Ciulla: I have a 1990 Toyota Corolla with 366,000 kilometers. Quick History: My alternator’s bearing burned up two months ago and broke the fan belt so I have done the following:

Purchased and installed a used alternator from a large scrap company and automotive parts supplier. The alternator was tested by this company as Passed and is still under warranty.

Replaced all three belts on the vehicle and re-tensioned them after several hours of running time.

All was fine until two days ago when the brake warning light and the charge light (little battery with + and – picture) both came on and remained on constantly. I immediately suspected an alternator problem but then I noticed that I had no low headlight beams and did not hear the familiar click of the daytime running lights coming on when I shut the car off and restarted it a few times.

All other external lights are working correctly, high beams, parking, side marker, tail and brake.

I visually inspected all fuses in the engine compartment and driver’s side kick panel, all okay, and removed both headlight bulbs to see if I could see one broken filament in either bulb as this is usually the case when I have replaced headlight bulbs in the past. Neither bulb appeared to have any broken filaments.

After looking at schematics from Haynes for the headlight system I see a Headlight Relay mentioned along with two 10 A fuses and on another page of the book I see mention of a Running Light Relay on the passenger side kick panel.

Two questions:

Are the Headlight Relay and the Running Light Relay the same relay. If not, where is the Headlight Relay located in this vehicle?

Do you suspect a faulty alternator component and can I test the alternator myself with a multimeter (analog) that only measures volts and resistance as I would like to learn how to do this.


A. 1. It depends if you have a Canadian model or a USA model. In the Canadian model it is called the Daytime Running Lamp Relay. In the USA model it is called the Headlamp Relay.

In the 1991 Toyota Corolla there are three Daytime Running Lamp Relays located in the dash behind the glove box.

2. If the CHARGE and BRAKE warning lights are on, that points to a bad diode pack inside the alternator. Read Charging System Check for information on testing the charging system.

Additional Information provided courtesy of AllDATA

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