Check the harness behind the drivers side headlight, connections can get weak behind it and that extends to the passenger side.


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Also when I turn either turn signal on they blink fast in the back.

 

This is caused due to the front turn signal not operating - GM's way of alerting the driver to a problem with one or more of the turn signals (the front in your case).

 

And how do I go about checking the connection?

 

Remove the driver side headlamp assembly and inspect the wiring harness and its connectors. Look for corroded or damaged connectors and/or wiring - especially pinched wiring that may have been damaged when the assembly was removed and re installed.

The assembly is removed by pulling up on the white plastic tab at the top, rear of the assembly - then carefully lifting the assembly up and away from the body. Instructions are in your vehicle owner's manual.

If the harness or its connectors are damaged badly and cannot be easily repaired, GM sells a forward lamp wiring harness (you don't have to buy the entire front body wiring harness). However, I suspect you will find a loose, damaged or corroded connector.

 

Got it fixed. The passenger side headlight plug had a bad ground so I just cut it and ran a new wire until I buy a new plug.