Change rear turn signal light

How do I know if my flasher relay is bad?

Symptom of a bad or failing turn signal / hazard flasher is hazards or turn signal lights that do not function. If the flasher breaks or has any internal issues it can cause the lights to malfunction, or not respond at all when the turn signal lever or hazard light button are pressed.
Jan 19, 2016

Symptoms of a Bad or Failing Hazard / Turn Signal Flasher - YourMechanic

For the cost involved, I would change it.

https://www.fixya.com/cars/t24552531-flasher_turn_signal_located

https://www.google.com/search?q=2011+kia+sorento+flasher+relay

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Note the diagram. Left rear turn, the light green wire with orange tracer is voltage. The black wire ground. You need both voltage and ground. Use a test light to check. The voltage for turn signal comes from multifunction switch. As far as the ground, you could try a redundant ground? good luck

Lamp, bulb, supply and ground obviously ok as the hazards work - I suspect the hazard switch might be faulty or something like a dodgy multiway connector onto the switch...

Brake lights /rear hazard lights not working - Ford Truck ...

www.ford-trucks.com > ... > 1967 - 1972 F-100 & Larger F-Series Trucks
Jul 9, 2010 - After checking the brake lights I tried the emergency flashers and found that they are working in the front but not in the back. I do have rear turn ... 1995 F350 Brake Lights / Turn Signals not working
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check the bulb there some bulbs have two elements in them the turn signal element might be broken change the bulb

check the elements in the light bulbs sometimes they short together

most likely the RF turn signal does not operate. turn on hazard lamps and walk around vehicle to confirm all lights operate. addresss the inop lamp to correct rear turn signal lamp concern.

More than likely, the problem is in the turn signal modual. The turn signal/cruise control/wiper/bright switch is all contained in the module in the steering column. Mine did similiar stuff a year ago.

Have you checked your brake light fuse? If it is good do your rear turn signals work? If you have turn signal and no brake lights it is probably the turn signal switch these are a common problem and your power for your brake lights goes through your turn signal switch. Sometimes it is actually the hazard switch that melts but this can not be serviced alone. If you have no rear turn signals and no break lights it could still be the turn signal switch but is more likely to be a wiring problem in the rear usually trailer wiring T connections. Chiltons has wiring diagrams in there manuals but they are not always accurate. Let me know if I can help you further and please rate.