How do I get to the electronic flasher - for the turn signals - to replace it?

Looking at the schematic diagram for the system(s), the flasher module is the first and only component common to the turn signals and hazard flashers, Unless the replacement module is bad, then there are only two possibilities: Both the Left and Right Turn Fuses in the left instrument panel fuse block are blown, or you have a ground problem from the flasher module.

Most likely this is a brake light switch issue. Replace switch.

If your emergency flashers don't work, all flasher bulbs are fine, but flashing too fast, then check and replace Hazard light switch.

This is weird! It seems to me that the left turn signal is getting 12v from somewhere at all times.I don't think the flasher is the problem(most GM systems use a single flasher for left and right)You probably have a crossed wire somewhere(or an add on accessory was connected to the left signal wire,allowing 12 volts to bleed through to the circuit)

First, is it doing it on BOTH isdes or just on one side? Example: turn signnals flash OK when turning left, but only come on and stay on when turning right. If it is doing this, then you most likely have either a blown bulb or a bad bulb socket on the side that is not flashing. You need to check both the FRONT and REAR bulbs to make sure they are all functioning properly.
If it is doing it on BOTH sides, then you either have a bad flasher, or at least 2 bulbs burned out (one or more on each side).

Are you sure you replaced the correct flasher? The flasher for the HAZZARD lights is plugged into the convinience center under the left side of the dash. If this is the flasher you replaced, it is the wrong one.
The turn signal flasher is mounted to the driver's knee bolster bar near the steering column. It is held to the bar with a clip. (see diagram)

YOUR CAR USES A ELECTRONIC TURN SIGNAL FLASHER .IT CONTROLS THE 4WAY AND TURN SIGNALS SOUNDS LIKE THE FLASHER CONTACTS ARE BURNED FAST .REPLACE THE FLASHER UNIT.

Get the proper flasher from the parts store and start searching under the dash for the one that clicks when the turn signals are operating.

I have the exact same problem. I replaced both underdash relays, checked all fuses and replaced the turn signal switch. Still no turn signals. Did you figure out what was wrong with yours?

possibly one side of your signal flasher is out turn on emergency flashers to locate one flasher then you can locate the other

For 3 bucks or so, I'd do what bunnydawg suggests & look for the signal flasher & replace it, or try 4 way flasher in signal flasher spot & it will tell you.