Did you already check the bulb for your left signal light (it may be busted)?

Air bag module and you have misread the number. It actually reads E8EB-14A679-AA. Google the number and you will find some available.

It gets wet when your evaporator drain hose is clogged (when it’s get wet and not raining). If it rains, it is possible that your weather stripping is deteriorating.

Most of the time the cause is a bad EATC control head (The buttons that you push) but you must verify that there is no vacuum leak in the vacuum supply line or components including the control head. There is a procedure to confirm this if it is the control head but requires removal of the control head to access some things at the rear of the unit. If you want the procedure I'll post it. Let me know if you want to DIY this procedure. You need to be a bit mechanical for this test.

suspect blower switch.

under the hood locate the blower motor, it is on the other side of the HVAC box more toward the center of the car than the clower motor. there are two screws holding it in and the wiring goes from it to the blower motor. below is a good picture of what it looks like

http://www.autopartswarehouse.com/.../SIRU407.html

Change A/C cabin air filter. I have the same problem. I wish I could tell you where it is located. Make that your next question. Hope this helps.

Check your Fuses and your grounds leading to the lights. If that fails there might be a master relay under the hood

With those symptoms I'd guess the contacts have receded in the switch housing. Check the connections on the headlight and see if its getting power.

ITS A BAD HEADLIGHT SWITCH REPLACE THE HEADLIGHT SWITCH AND YOUR LIGHTS WILL WORK FINE TRY GOING TO A LOCAL JUNK YARD OR YOU MAY HAVE TO ORDER A NEW ONE FROM THE PARTS STORE OR DEALER

Bad EATC control head or a vacuum line is disconnected. Likely the control head (the push buttons) - get ready for sticker shock.