High beams do not work

Hi,

Thanks for your timely responses.

1. My car does not have DRL's.
2. I did the following tests (while switching high beams on).
- Check voltage between two terminals of the bulb base, 0.
- Check voltage between battery negative and two terminals of the bulb base, both are 0.
- Check voltage between battery positive and two terminals of the bulb base : both 12 volts.
- Check voltage between battery negative and both sides of the fuse, both are 0.

Looking forward to your replies.

Sorry,

When I said "check voltage between two terminals of the bulb base", it means voltage between two wire connector at the headlight. It is 0.

Thanks again for you replies.

In tests number two and three, I did attach voltmeter ground lead to the battery negative post and use positive lead to check voltage at, both leads on the bulb plug as well as both sides of the fuse, there are no voltage. I guess I have an open circuit one this side of the bulb plug.

I do not think I have bad ground as I attached voltmeter on battery positive post and checked
voltage at both leads on the bulb plugs (test no.1 ), both read at 12 volts ( it means the ground is okay, does it not?).

Now the next step is to track down the open circuit, is it not it? It is not the fuse since both sides of the fuse read 0 volts.

Next is the DIM relay. In my car, there is only one DIM relay for both high and low beams. Low beams work so DIM Relay is okay, I guess.

I might be the combination switch which is faulty so I thought I could test the continuity of the switch, but do not know which pins are used for high beams on my model.

What steps do you advise me to take? Appreciate your time.

Hello again,

The diagram does not look like what I have in my car.

My car has four fuses for each lights and the relay is Dim relay ( please see the photo attached).

Car model is MCX10R Mark II Conquest.

Again thanks for your patience,

I should disclose that I am from Australia, are your diagrams for US models?

My car has four fuses for four lights and it does not have DRL (I searched all over the engine department but found no relay labeled DRL). I do not think I ever use it (DRL). Also, your DRL diagram shows that lower beams use 15A fuses, mine (from the photos I attached) shows that lower beams use 10A fuses.

According to wikipedia (https://en.wikipedia.org/wiki/Toyota_Avalon), 2002 Australia Avalon should be the first generation Avalon. However, when I looked at diagrams for first gen (from the old post, https://www.2carpros.com/questions/toyota-camry-1999-toyota-camry-high-beams ), the circuit without DRL does not match either.

I am trying my luck to see if anyone has my model's diagrams.

Hi,

Thanks all for the answers so far. I think I found the problem.
Today I decided I will check the dimmer relay first. I took it out and check voltage between dimmer plug terminals.
1. 12 volts between two and four, which means the switch circuit is good, what a relief.
2. 12 volts between one and four, which is expected because the low beams work.
3. 12 volts between three and four, which means high beams circuit is good, voila. I connect them using a wire and high beams turn on.

So it is the dimmer relay is faulty, although I heard the click when high beams switched.

I am lucky because it is just dimmer relay. I still have not found the correct diagram for my car. The last diagram Patient_Repair_Pro attached does not have dimmer relay, which switches between low and high beams. Plus, all diagrams so far with DRL have DRL relay number four but in my car, I only have DRL dimmer relay and head relay.

Thanks again.

Yep, relay number two is the same as dimmer relay.

The tenth digit of my VIN number is letter "O" or zero 0, which means it does not exist, does it not?

Hi,

Sorry for late reply, please see the attachment.