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Hello I will help you with your question,
Is it the turn signal indicators on the dash that you are seeing or do they flash?
Are the light bulbs original or have they been replaced?
OK, the rear lights have not been replaced and the turn indicators come on but do not flash when you step on the brakes, is that correct?
Is there any body damage?
If the bulbs are original then the problem is in the rear lamps, can you pull the bulbs and inspect them?
Were the rear lamps replaced with original style bulbs or aftermarket LED bulbs?
I am thinking that your brake lamps are backfeeding into the turn signal circuit. They share a ground in the back so I am asking if there is any body damage and if the bulbs are original style.
OK, then first place to check is the G701 ground below the access to the left bulbs. See if it is corroded or loose. You will see a cluster of wires bolted to the body inside the lining.
This is a 4 door?