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Do you have a volt meter?
I see you have power out at the headlights. This means they are lacking ground.
This is going to be a little tricky for us to determine where the cause of the problem is, but I feel we can eliminate some things.
So, the first thing I would like to have you check is continuity to ground on the yellow/white stripped and yellow/blue stripped wires out at the harness connectors near the headlights. Try this with the lows on and not working and let me know if there is ground there.
Ok, basically the first thing we are checking is to see if ground is missing from the DRL module. Also, when you go to high beams, will the high beams work after that or then you simply get no lights at all?
Out at the headlights there should be a 3 wire connector, it should have the wire colors I gave you, one is one side and the other color the other side. The first is driver side.
Please see the diagram
Is the brake light on by chance? The one on the dash?
We are going to have to locate the wiring in the steering column next to see if the light switch is sending signals to the drl module. If it is, then the module is the likely issue here.
If the parking brake light is on though, it might be the parking brake switch.
This is going to be a fairly large connector possibly at the base of the steering column under the dash. We are going to pick on 4 wires. First thing that we need to check is the Orange/white wire. It should have power on it with the headlights off and the key on.
Please check it out and let me know.
Ok, then we have to run the test on the switch.
If it's not sending any signals then we know the switch is the problem, if it is, then the module is the issue. It's possible the module is getting hot and shutting down, but can't be 100% sure if the module is the problem without testing.
Well, in essence we are testing it as best we can without a scan tool. Basically we know it's not providing ground or the lights would work and you would have ground on the wires I had you check.
Subaru doesn't provide the exact location. I have the wiring harness routing and the connector number. I am sending it along with it highlighted. Should help. Upper left corner under the dash.
Yes, but it's just the harness routing, it should give you a general area. It looks like it's basically a black box with 2 harness connectors going to it. Also, you may be able to unplug the white harness and have the headlights return to normal without the DRL. If this works, then we know it's the DRL module for certain.
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Sorry we weren't able to locate the exact issue, but I suspect the drl module will be the repair.