Whenlow beams are on and i put the high beams on, both low and high go out. i replaced the multi funtion sw., the bulbs and relays. help.

could it be the low beam relay ,they do burn out

The multi funtion control is shot, It will have to be replaced.

The multi funtion switch problly has to be replaced,

[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?

yes, it's a complicated circuit, so there are lots of possible reasons. The most likely problem is the DRL relay or the hi-lo/dimmer switch. Since you say the DRLs work, I would check the hi-lo beam switch to see if it has continuity between the tan and yellow wires when set to low beams.

have you checked the fuse for the head lights? it only has one bulb for both low and high beams, so it could be the low beam fuse that went out, and if not replace the light bulbs, but make sure you check the fuses first.. good luck!

Start, check for 12Vpwr. eng. comp fuse box 30A runs into the multifuction switch.
Head light sw. runs into the multifunction switch.
out of multi sw. pass. comp. fuse box 20A # 38 for high beam
out of multi sw. two 10A fuses #10 & #4 for low beam
make sure you grounds ar good G102 & G103
G102 LH front eng. comp.
G103 RH front eng, comp.

The multi function switch does have the dimmer switch in it, but that is only a momentary contact to toggle the relay.
But is does not have to be the relay either, it could also be fuses, since the high beams and low beams have different fuses.
It is even possible both bulbs burned out at about the same time.
Use a test light to verify before replacing anything.

the head lights have tree wires goig to it one groun one gets power when high beams on the 3rd gets power only with low beam on test the wires or try by plugin a good known head light to conector if it works with low beam then replace both head ligts because head light come with two bulbs in one high and low