Vehicle is 2004 Chevrolet Impala.
Problem is left and right headlamps nt working,but all other lights functioning right.
Troubleshooting details:----
First confirm the headlamp controlling fuses are not blown.
Next check the headlamps,are they blown or are they powering up right if you try them connecting anywhere else.
If both bulbs and fuse checked ok,
Then the issue can be with faulty headlight controlling relay.
These relay is located in the left side dash junction box.It will be on the driver side end with the door open.Also there will be the Access panel to be removed.Once the panel is dismounted,the internal fuse box diagram will be seen.It will give accurate info of which fuse and which relay is for what purpose.
These details will help
Thanks
