Would Dealer Reprogramming Fix No Taillights on 2017 Jeep Grand Cherokee

Question:

If the harness isnt activated by the dealer would the brake and turn signal lights still work on the trailer just not the running lights? In other words- the brake and turn signal lights are working on the trailer but the running lights are getting no power from the vehicle. Could that mean I need the dealer to activate or are they all or nothing?.

asked by: Paolo L

Helpful Expert Reply:

If the vehicle requires dealer reprogramming then it's likely that none of the trailer lighting signal would work. If you only have a few that are not working then this is just likely a blown fuse so that is what I recommend checking first. The owner's manual for the vehicle will be able to tell you what fuses are located where. If the fuses are good then you'd need to take a trip to the dealer. That said, you can bypass any factory trailer wiring issues using the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118727 as it plugs-in behind the taillights.

expert reply by: Conner L