Having problems with your 2004 GMC Envoy ?
2003 gmc Envoy Low Beam Headlights both quit at the same time. Checked fuses and replaced bulbs. No dice. ????
Relay in fuse box under hood on driver side wheel well labeled HDM, #46 on 2004 Envoy XUV. Swap with relay #45 labeled "Fan" to test. That was my problem.
Could be a relay
Repair Help & Product Troubleshooting for 2004 GMC Envoy
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