Need to access the front left turn signal bulb to replace it.

If the front and rear bulbs flash fast also, replace the hazard switch or you could live with it. As they are working. If one doesn't work, check grounds. I just run a new ground, much easier than cutting open the harness to find the break.

Did you verify that both turn signal bulbs were working on that side of the car? If so you may need to replace the turn signal flasher.

Instructions
1Start your vehicle's engine. Turn the steering wheel the opposite direction of the bulb you need to change. If you need to change the left turn signal light bulb then you will turn the wheel as far as you can to the right. This moves the wheel out of the way so that you have access to the fender and the turn signal assembly.


2Get down by the front fender of your vehicle. Use a Philips screwdriver to remove the screws from the wheel well cover. Take off the wheel well cover and set it off to the side.




3Stick your hand into the wheel well and find the turn signal bulb. Turn it to the left and unscrew it from the turn signal assembly. Remove the bulb.


4Take your new turn signal light bulb and screw it into place using your hand. Replace the wheel well cover and use the Philips screwdriver to secure it in place. Repeat this process for the turn signal on the other side of the vehicle.

Read more: Chinasinoy

Changing front, right turn signal on 2005 Buick Terraza: Open hood; when facing the front of vehicle, the right turn signal is on the passenger side (left). The headlight assembly needs to be removed to easily reach the turn signal. On my vehicle, there is a 10 mm screw on the left side. Remove it. There is L-shaped pin on the right side of the headlight assembly. Swing the pin counter-clockwise (to the left). Pull the pin straight up to remove. The headlight assembly is now loose, but there is a pin snapped in a socket on the back of the assembly that still holds the assembly. Pull the headlight assembly hard and straight to the front of the vehicle. When it snaps loose, the assembly is now held just by the rubber gasket surrounding the assembly. You need to gently work the right side of the gasket out of the grill cowling. The assembly should pull straight out. The wires are long enough to lay the headlight assembly in the engine compartment. Finally, the turn signal is now accessible. Twist the light holder counter-clockwise and pull out the light holder. Change the bulb. Do not punch your man-card for credit until you have successfully reinstalled the headlight assembly. It goes back in a little easier the second time. Once you have put the L-pin in place, the screw back, and successfully tested the lights, you can now punch your man-card.

I give the mechanical engineers and designers a D-minus instead of an F only because I was successful on the first try. No light bulb on anything commonly used by people should be this hard to figure out.

The piece of plastic that fills in under the front of the car is held to the front fender, the wheel well liner and the air dam with a number of screws. There are also two splits in this cover immediately adjacent to 2 of these screws - if you remove just the two screws that are behind the air dam that connect the black plastic to the fender, you'll find that you now have a small door that will hinge downwards to let you get your arm in. The turn signal bulb socket is now accessable. Press in the locking tab and rotate the socket to remove it. Replace the bulb with a 3157LL bulb. (The factory bulb is a 3157K, the 3157LL is a "Long-Life" bulb), and considering what a pain it is to change, long-life is well worth the extra buck or you can replace them with the LEDs that are out now. Good luck and hope this helps.

Signal and Marker Lights REMOVAL & INSTALLATION Front Turn Signal and Parking Lights

1. Disconnect the negative battery cable.
2. At the rear of the front bumper, turn the bulb socket 1⁄4 turn and remove the socket from the parking brake housing.
3. Remove the bulb from the socket; if necessary, replace the bulb.
4. If lens replacement is necessary, remove the retaining bolts and remove the lens from the bumper.
5. To install, reverse the removal procedures. Check the turn signal/parking light operations.

Fig. 1: Common front turn signal/parking light mounting


Fig. 2: Twist and remove the bulb socket from the back of the turn signal/parking light lens


Fig. 3: If lens removal is necessary, loosen and remove the retaining bolts

Your front turn signal socket is shot. Buy a new one at the dealer for about 30.00. It will fix it. You may be able to clean it and wiggle it to get it to work. But it wont last very long. I had the same problem. Replaced the socket and it is fine. Note: If one side is bad the other side it not far behind. Probably 2 or 3 months it will go also. Good Luck.
Bill

yes

Here's a diagram