2004 coupe: my left siginal started blinking rapidly. the front turn signal does not blink but the rear is rapid. right siginals are fine .emergency works fine Is this the front bulb gone bad. thanks joe

 

Rapid flash tells you the bulb is dead.

You'll get three suggestions

Go in through the brake ducts - not easy with a Z06 or if you have screens

Go in through the bottom by taking out the lower close out panel



The one that works for me is:

Turn on the headlights and back off one position to kill the lights.
Unscrew the 3 small screws on the black plastic housing around the headlight. Gently pull the housing clear. Reach down around the headlight unit and release the bulb holder. It comes out by turning the bulb holder a ¼ turn counter clockwise but it has a plastic clip which you need to squeeze to release it. Here’s how the bulb fits into the lamp unit. The DRL bulb is the lower of the two.



Here’s the light socket. This one’s after market but it gives you the idea. You can see the clip you need to squeeze.



BTW, if you ever need to replace this socket the part #s are GM 12083689, AC Delco LS15 or Dorman 85882 (Thanks to UM Rebel)

Change the bulb. It’s a push fit into the lamp holder. Push it home firmly but don’t handle the glass. Use latex gloves if you have them. Reseat the bulb holder and turn clockwise until it clicks back in place. Put the plastic headlight housing back in place making sure to locate the small plastic tab in the bracket on the headlamp cover. Replace the 3 screws and close the lights.

It’s a 10 minute job. Some guys have had the lights close if they’ve taken a while to do the fix. If you’re worried about that, disconnect the battery once the lights are up.

The bulb is a 4157NA A 3157 will work but the 4157 is slightly brighter (28.5 vs 27 watts for the 3157).

Some guys with big arms remove the hood adjusting screw for better access. Guys with even bigger arms have had to take off the headlight cover. Four torx screws (2 back, 1 each side). Take the back ones off first with the lamps down. Raise the lights and take the side ones out.