Do not have rear turn signals but the front

Make sure that all the bulbs are the correct ones and have a good ground.

Turn Signal Lamps
The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the left or right position, ground is applied to the BCM on the left or right turn signal switch signal circuit. The BCM then applies voltage to the appropriate front and rear supply voltage circuits.
Grounds for the various lamps are as follows:
• G100 supplies the right front lamps
• G101 supplies the left front lamps
• G400 supplies the right rear lamps
• G401 supplies the left rear lamps

Replace bulbs in front would be the 1st thing. If that doesn't fix it check the wiring between the switch and the front turn signals. The rear ones flash fast to indicate a problem with the front signals. Usually the bulbs are out in the front.

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Replace the bulb

Looks can deceive you. If the front light comes on when the turn signal is on but there is no blink you need to find a burned out bulb on that side. Many cars have more than one bulb in the rear. One bulb out of the set can stop the blinking.

I doubt the rears will work.
Your TSM will see a break in the current.

However, with just the fronts removed, installing a load equalizer MIGHT trick the module and the rears to work.

There are kits that relocate the front turn signals to the fork tubes between the upper/lower triple trees, and there are aftermarket rear view mirrors that have the front turn signals built into them.

I would suspect the turn signal switch is defective, that is the most common cause.

The 2 filament on the LH Front turn signal is most likely burned out, ...........or the ground to it, & the entire socket needs replaced. Caution lights, send signals to ALL FRONT & REAR lights. All turn signal lights must be in working order, as it is a "pulsating" currect surge sent to the bulbs, LH or RH, depending which direction you wisk to turn. If 1 filament is broken, the circuit is incomplete, & no flash will occur. Usually you will get one light that stays on, & the front or rear missing lighting, is the one whichis the culpret.

Hello. This happens when one of the bulbs is starting to go bad. pull all of the turn signal bulbs and look carefully at each one. you will find one with the filaments crossed. Replace that one. J.