Good morning,
Diagnostics cost money and $50.00 is very cheap for a diagnostic. You need to have this done otherwise they will be guessing at there failure on your dime.
If the turn signal switch will not move up or down, they need to see why by removing the steering wheel and inspecting the switch for the failure.
As far as cost, that repair could run $150.00 to $200.00 depending on if it is the switch but that needs to be confirmed.
I attached a wiring diagram for you to view. Check the wire from the stoplight switch to the turn signal switch for power with the brake pedal depressed to be sure power is going to the turn signal switch.
Roy
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Tuesday, October 1st, 2019 AT 2:47 AM