Hi, the problem can be the relay or the body control module. The thing to do is pull the low beam relay out of the relay box under the hood and swap it wil the high beam relay. If the low beams start working instead of the low beams, buy another relay for the high beams. If there is no change, pull the relay out again and interrogate the relay socket with a 12 volt test light or voltmeter. Connect your test light clip to chassis ground and probe the relay socket. There should be 2 hot terminals in the socket. If not, there is a problem with the fuse box. If you get these 2 hot terminals, move your test light clip to battery positive and probe the other 2 terminals in the socket. With the headlight switch off, there should be one terminal that lights the test light dimly. If not, there is a problem with the wire from the relay to the headlights. If this is OK, next turn the headlights on (low beam setting) and probe the socket again. There should now be 2 terminals that light the test light. If not, there is a problem with the wiring from the body control module, the module itself, or the beam control switch. If you get to this point, you will need to check the signals AT the BCM to determine if the BCM is to blame of the switch. Please get back to me for these additional steps, if you get stuck here.
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