2005 Chevrolet Impala Change Turn Signal Bulb

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The 2003 Chevrolet Impala is well known for its retro-styled rear turn signals, giving it the appearance of a vehicle with classic sealed beam tail lights. However, this is an illusion. The Impala uses standard capsule-style lights for the front and rear. The appearance is the result of a clever lens design. You may have to replace the turn signal bulbs once every couple of years, depending on usage. Replacing the front turn signals is much different than replacing the rear signals.

Tools Used[edit]

Bulb 3357NAK (front)
Bulb 3057 (rear)
Flathead screwdriver

Change Turn Signal Bulb[edit]

Front Turn Signal Bulbs

  • Turn the engine off and open the hood. Pry up the two fasteners from the radiator air baffle with a flathead screwdriver. Move the baffle to the side to access the top of the headlight case.
  • Pull up the two metal rods behind the headlight case. These secure the case to the vehicle. You may need your pliers to pull them up.
  • Gently pull the headlight case out to access its rear. On the rear, you will find several black dust covers. Twist off the dust cover closest to the fender (the outward dust cover) to access the turn signal bulb.
  • Turn the bulb module counterclockwise to release it. Unplug the electrical connector from the bulb module. Connect the new bulb to the electrical connector (don't touch the glass with your hands; hold it by the plastic piece). Insert the bulb module in the turn signal housing, turn it clockwise and screw the dust cover back on.
  • Insert the headlight case in the mount. Push the pins back down to secure it. Position the radiator baffle in its place and insert the fasteners.

Rear Turn Signal Bulbs

  • Open the trunk. Remove the cargo net from the side mounted wing nut (on the side with the faulty turn signal). Twist the wing nuts (there are two per side) counterclockwise to remove them.
  • Peel the carpet layer back to access the rear signal lamp wing nuts. Twist these wing nuts (two per side) counterclockwise to remove them and release the rear signal.
  • Carefully pull the rear signal assembly away from the Impala. The rear turn signal is the inner bulb (closest to the trunk). Press the tab on the bulb module and turn it counterclockwise to release it from the rear signal assembly.
  • Pull the old bulb straight off the module (don't twist). Insert the new bulb in the module. Depress the tab on the connection and insert the module back in the assembly. Twist it clockwise.
  • Insert the rear signal assembly. Re-attach the assembly's wing nuts and push the carpet layer back in place. Tighten the other two wing nuts to secure the carpet layer and reconnect the cargo net.