Replace the rear right turn signal bulb

check the bulbs when you get rapid flash normally 1 pf the bulbs are out

A dead bulb could do it.
Try the hazard lights to determine

replace both bulbs,, on the chevy they use the new bulbs with the very thin wire that goes into the socket, they have been having problems with the plastic in the socket getting hot and being partially covered, which makes the connection no good,, try this, with a small, screwdriver or if you have one a small pick tool, gently pry the wire outward from the socket,, Just a very little will do the trick,, then put the bulb in the socket, you should be fine after that ,, if the rear lights are working, then nothing is wrong with the signal switch, since they are on the same circuit. your hazard switch you replaced was probably ok also. if this doesn't work, do the same thing on the bulbs,, to insure a good contact

check all related fuses.Fuse panel on left side of dash.

there should be an access panel in the trunk.

FACE THE VEHICLE SO THAT BATTERY IS ON YOUR RIGHT;
2.REMOVE THE BLACK PLASTIC PIECE THAT RUNS OVER RADIATOR BETWEEN HOOD LATCH AND FAN. IT IS ABOUT 53 1/2" LONG AND HOLDS THE HOOD PROP CLIP. (3 PLASTIC PUSH RETAINERS & 2 SHEET METAL SCREWS);
3.REMOVE THE GRILL ASSEMBLY UNDERNEATH THE PIECE IN STEP 2 BY PUSHING DOWN FIRMLY ON 4 RETAINER CLIPS WHICH RUN ALONG THE TOP. USE A WIDE SLOT SCREWDRIVER. PULL UP GENTLY ON GRILL ASSEMBLY. IT WILL POP OUT. THE GRILL ASSEMBLY EXTENDS UNDER EACH HEADLIGHT ASSEMBLY (HA) AND IT DISPLAYS THE CHEVROLET LOGO IN THE MIDDLE. MY GRILL ASSEMBLY POPPED OUT EASILY AND ALL THE OTHER RETAINER CLIPS ON THE BOTTOM AND BENEATH AND TO THE SIDE OF HA WERE AUTOMATICALLY RELEASED WITHOUT ANY FUSS;
4.ON TOP OF HA SEE ONE TAB (ABOUT 1" LONG)ON THE RIGHT SIDE AND ONE ON THE LEFT (THE ONE ON L IS CLOSER TO THE FENDER);
5.PULLUPWARDDIRECTION ON TABS. THEY WILL SLIDE UPWARD A COUPLE OF INCHES AND WILL RELEASE THE HA WHICH YOU CAN THEN PULL OUT TOWARDS YOU;
6.AT BACK OF THE HA, REMOVE 2 ROUND RUBBER CAPS (ABOUT 4" IN DIAMETER)--ONE FOR LOW BEAM--ONE FOR HIGH. REVEAL BULBS. UNSNAP THE WIRE HARNESS FROM BULB BASE AND TURN BULB 1/4 TURN CLOCKWISE (REMEMBER YOU ARE FACING THE TRUCK)
7.REPLACE BULB(S). #9006 BULB IS GRAY-BASE, FOR HIGH BEAM ON OUTSIDE. #9005 IS BLACK-BASE, LOW BEAM TO INSIDE OF HIGH BEAM.
CHANGING HIGH AND LOW AND REASSEMBLY TOOK ABOUT HALF HOUR. GOOD LUCK. ALTERNATIVE: IF YOU ARE REPLACING THE PASSENGERSIDE HEADLIGHT JUST REMOVE THE AIR FILTER COVER AND PULL PLUG OUR FROM BEHIND HEADLIGHT AND REPLACE. BE CAREFUL HANDLING LIGHT BULB. TO CHANGE THE ONE ON THE DRIVER'S SIDE JUST REACH IN FRONT OF THE BATTERY TO ACCESS THE PLUG AND HEADLILGHT. TOOK ABOUT 5 MINUTES. ENJOY YOU TRAILBLAZER, GREAT TRUCK.

check the bulb with a test meter and alsof or a feed

resistance from the bulbs activate the flasher, so if a light is out it won't flash, could be a ground or an open circuit, time to check wiring

Thanks Pierre!

Merci beaucoup!

Everything worked as mentionned. Be carefull with the plastic in the winter. Make sure to use a flat screw driver and get it close to the slider and not on the edge. I cracked one of the tongues. Those L shaped slots are under the plastic cover with the two big plastic plugs that you also remove with the flat screw driver

Pierre Godin, Boissevain Manitoba.

If it's a Malibu Maxx, there will be no wingnut to take off. Just unscrew the the two screws you can see (and that the book tells you) and pull back. The entire piece comes out - so be prepared for that.

Mine stuck a little on the bottom but after wiggling a bit - I grabbed the part that the screws came out of and it came out REALLY easy. It's the middle bulb. When done - just put it back in place and line the screws up.

This is the first time that I've ever had to remove the entire piece like you have to do on the Maxx - but once you get past that and the worry about breaking it - you'll be fine.