Turn signals not working ? - 1996 Chevrolet Blazer

There are a few possible reasons why your turn signal light is not working while your brake and tail lights are functioning properly:

1. Blown fuse: The turn signal lights are connected to a different fuse than the brake and tail lights. The fuse for the turn signals may have blown and needs to be replaced.
2. Turn signal switch: The turn signal switch, located on the steering column, could be malfunctioning and needs to be replaced.
3. Wiring issue: A wiring issue, such as a broken wire or loose connection, could be preventing power from reaching the turn signal lights.
4. Flasher relay: The flasher relay is responsible for controlling the turn signal lights. A faulty flasher relay could be preventing the turn signals from working.
5. Signal/light module: Some cars have a signal/light module that controls the turn signals, this could be faulty and need to be replaced.

Do you know anything about automotive electronic's ? BCM - body control modules ? DTC'S - diagnostic trouble codes ?

Turn Signal Lamps
The body control module (BCM) is responsible for controlling the turn signals and hazard lamps. When the turn signal switch is placed in either the left turn or right turn position, the BCM receives a signal from the turn signal switch. The BCM then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, the BCM receives a signal from the hazard switch. The BCM then will send an on-off voltage signal to all the turn signal lamps. All the turn signal lamps will flash including both IPC turn signal indicators.

Hooking up a professional type scan tool an checking for DTC'S in the BCM would be the first step in the diagnostic procedure .

In the diagram for rear lamp, the top wires are voltage, the bottom black wire is ground. The brown wire on either side should be tail lamps, goes hot when you turn on the headlamp switch. The other top wire on either should be for turn signal. With everything turned on, is there voltage on that wire?
Because the front works and the rear don't, possible wiring circuit problem? The voltage for turn signals comes from bcm. The bcm knows when you turn on turn signal switch, either side, then the bcm sends voltage to turn signal lamp at the rear and front.

either wrong signal bulb or short in left turn signal wiring if both left signal lamps not working.if only one of left turn signal dont work could have corroded bulb socket spray a little electronic cleaner in bulb sockets see if left signal work.

https://s1.postimg.org/89tia75ozz/turn_signal.jpg

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This is for turn signals. Get at the turn signal switch. See the purple wire, L terminal on top of turn signal switch in diagram, that should go hot with key on, use jumper wire from that terminal to one of the wires on bottom of turn signal switch in diagram, those are, front/rear, left/right turn signals. If the turns signals work properly with the jumper, but, other wise don't, the problem should be the turn signal switch. If it still doesn't work properly, you would have to check wiring circuits.
Sometimes a faulty ground can cause weird problems. Sometimes the bulb doesn't make good contact in the bulb socket? Try putting a little pressure on the bulb in the bulb socket, see if it starts working?

my oldsmobile 1995 cutlass supreme has the same problem, so I replaced turn signal switch.

Sounds like the flasher unit to me. Normally the emergency flasher and turn signal are separate.

Turn signals have a relay (its a small switch that charges and discharges current) which controls your turn signals blinking speed and interval. This is most likely your problem. You should be able to get a new one at your local parts store. Follow these instructions, in this order, and let me know how it works.

Step 1:Turn on the hazard lights and walk around the Taurus checking that all four turn signal lights are working. If any of them are not working, replace the bulbs. A non-working bulb in any of the turn signals will often make the turn signals appear that a flasher is going bad.

Step 2:
Locate the fuse box and check the fuses for the turn signals. There may be more than one. Replace any fuses that are blown and then recheck the turn signals again. If they still aren't working properly, then move on to replace the flasher. Step 3: Look for a round, silver-colored object near the fuse box. Put your finger on the object and turn on the turn signal. You should be able to feel a mechanical clicking as the turn signal blinks. This is the flasher. Step 4: Pull the silver flasher out of the socket and replace it with the new one. Each of the flashers should have two pins sticking out of the bottom side. Start the Taurus and recheck the turn signals to ensure that they work. Joel

replaced turn signal flashers and muti switch turn signal still won't work Why?

Now replace the flasher unit! Frankster016