Low beams stopped working bulbs fuses relays are good replaced head light switch Drls work

If you have already replaced the switch and checked the connections, there could be a few other possible reasons for the low beams not working:

1. Relay issue: The headlight relay controls the low beams. Check if the relay is functioning properly, if not, replace it.
2. Fuse issue: Check if the headlight fuse is blown, if so, replace it.
3. Wiring issue: There may be a problem with the wiring between the switch, relay and lights. Inspect the wiring for any damage, such as frayed wires, loose connections, or melted insulation.
4. Ground problem: Make sure that the ground connection to the headlight is secure.
5. Light bulb problem: Finally, check if the low beam light bulbs themselves are functioning.

If these checks do not solve the problem, it may be necessary to take your truck to a professional mechanic for further diagnosis and repair.

I DON'T KNOW. $1000 ASSEMBLIES ARE PROFIT MAKERS FOR DEALERS. I THINK ASSEMBLIES ARE JUST PLASTIC LIGHT SHADES AND NOT RELATED.
VISUALLY COMPARE PART NUMBER OR LOOK OF OLD BULBS WITH NEW BULBS. CHECK WITH CAR MANUAL.
WHAT IF THE LIGHT SWITCH OR RELAYS ARE FAULTY.?
AT NIGHT LOOK AT RUNNING LIGHTS. HAVE SOMEONE TURN ON LOW BEAMS.THEN HIGH BEAMS TO BE SURE.
YOU HAVE 3 LIGHT LEVELS. YOUR RUNNING LIGHTS AND HIGH BEAMS ARE WORKING BUT NOT YOUR LOW BEAMS. LOOK IN YOUR OWNERS MANUAL FOR THE HEAD LIGHT FUSES AND OR RELAYS TO SEE IF THERE ARE SEPARATE ONES FOR HIGH AND LOW BEAMS.

Make sure the other filament is good and that it is receiving power. If no power check relays, fuses, switches,etc for low beams.

low beam bulb quit

The standard lights are quite good enough if the reflectors and lens are really shiny and not partially rusted. Large bulbs run the risk of melting the plastic reflectors costing new head lights. Adjusting the head lights to correct beam height will also help. You can use relays in the system. Disconnect the wires to the back of the bulbs and attach then to the trigger pins of the relay (4 relays-2 high beam L+R and 2LBeam L+R). Run fused power wires from the battery to the power pin of the relay and out to the beam pin of the bulb. earth the bulbs as normal. The operation works like this You switch on the lights to low beam and the power from the switch energises the relay and drops in the contacts which allows power from the battery ,through the bulb low beam to earth. Switching to high beam energises the relay and allows power from the battery through the relay and out to the high beam part of the bulb through to earth. You have full 12 volts to the lights and reduced current through the light switch. 4 relays --1 each for each light low and 1 each for each light high. jump the wire from each beam position between relays of the same light so that they work off the one wire from the switch

[Information] For a 2002 Toyota Camry, the Daytime Running Lights (DRL) operate utilizing the High Beams (inner Lamps closer to the center of the vehicle front) at a reduced power.

[The troubleshooting process:] Review the Owner's Manual and ensure the test configuration matches the following criteria:
1. According to the 2002 Toyota Camry Owner's Manual (Check your Owners Manual):
"The DRL system will make your headlights come on at a reduced brightness when:
The light switch s in the "DRL" position.
The ignition is on with the engine running.
The headlight switch is off.
The parking brake is released."

2. Set the Test Conditions according to Step 1 above.

3. Check the headlight bulbs to ensure they are not burned out. If one burns out, there is a fair chance that the other would have burned out at the same time. Replace as necessary. In this case, if the high beams operate, the DRLs should also operate.
4. Test the system, ensuring the step 1 conditions are set. (Engine running, Multi-function Switch on Turn Signals in "DRL" position, headlight switch off (repeating what the manual says -- it should be obvious that in the "DRL" position, the headlight switch should be off / do not have the switch positioned to "High Beam"), and the Parking Brake "off").
5. If DRL lights do not work, check the engine compartment Fuse and Relay Box. there is a 5 Amp DRL fuse -- replace it with the spare. Test (step 4).
6. If it does not work, swap around or replace relays -- there are three (3). Any one of them could be bad (stuck or burned out). Test (step 4).
7. Other less likely possible issues could be that the Multi-function Switch is broken or a connection / wire is broken. [Beyond the scope of this process.]

My problem was that the test configuration did not have the engine running and parking brake off - Step 1. Problem solved with much thought, repetitive tests on the vehicle and going back to the basics -- what does the Owner's Manual say and where are the applicable fuses and relays located?

if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals

this could be solved by taking the bulb out of its holder and cleaning the contact of the bulb and holder.
turn the ignition on after this with the bulbs in the holder and plugged in but not in the headlight kitself.Turn the lights on and see if the work if still the same try moving the bulb while on in its older and see if its just loose. if so holding it one way it will work. wedge something something to hold it in place or buy a used bulb holder.
Check the fuses at the same time and the wire plug that powers the bulb. check and clean the contacts of these also
Let me know how it goes and ill help again if it persists.
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Check the relay or your head light switch has gone bad. 

thare is a high beam relay and a low beam relay in the fuse box find the low beam relay and replace it. if this dont work its probabley the switch