The module is failing. The turn signals and emergency flashers are both controlled electronically. The module is behind the emergency flasher switch and requires partial disassemble of the dash to access it There are several screws: 2 on the ends under the fuse covers 2 on the panel under the steering wheel and 2 by the odometer Take your ignition key off the ring, put it in the ignition and position to run so that you can put the column shift into 1 (full down) and put the steering wheel to full down in order to get the clearance to get the pannel off. Gently pull the face off the dash. Don't break off the clips. A replacement is about $40 from the dealer. GO to the junk yard and if your lucky u might find 1 for 10 bucks.. this is a commen problem with impalas i bet i looked throught 15 cars b4 i found one with a switch in it. why buy a new switch that will go bad when u can get a used one that might do the same
Try turning the hazard flashers on and off a couple times, see if that starts your signal lights working. If so, replace the hazard switch/module.
Defective flasher module - common problem
See Hazard Warning Flashers on page 3-6 of your "Owner's Manual", under Section 3: Instrument Panel Overview.....
Turn signal flasher is part of the hazard warning module and replaced as a unit
See {Hazard Warning Flashers} on page 150 of your "Owner's Manual" for info, and item "E" on page 148 for location.....
The module in the dash is for the turn signals and hazard flashers. It is the flasher unit for both so since this occurs when using either system i suspect the module itself is faulty..it is a common part that fails on these.
The hazard switch itself is bad. The flasher module for the turn signal is built into it. Replace it yourself for 100 dollars(cost of part).
First be sure to check all fuses. If OK, then a common cause is actually the hazard switch. This is also the turn signal flasher. Try ressing in very lightly on the hazard button and see if the turn signals start to work. Of press button on and off very quickly and harchly several times, then try the turn signals.
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Part of the hazard warning module
http://www.topix.com/forum/autos/chevrolet-impala/T4P2NGT979PJ7QT2P
It is integrated into the hazard switch on the dashboard