can you check the fuses for the turn signals themselves ?
for bat voltage -both are 15 amp fuses if you have voltage then you will have to check at the body control module
I am including 2 diagrams -one showing imputs to the BCM and the other showing OUTPUTS from the BCM to the lights
the one for the outputs a re # ***** -yellow wire for the left turn signal rear
# ***** -dark green wire for the right turn signal rear
# ***** blue/white wire for the front right turn signal
# ***** -light blue/white for the front left turn signal
the imputs are red/white wires from the fuses (underhood) to the bcm these should show voltage when the key is on and the turn signal in on left or right .
I would have to say that the multifunction switch assembly is most likely the issue a s you also, don.t have hazzards as well. but you have brake lights .
if it was an issue with a flasher the lights would light up but would not flash ..jazzmaster ..