I don’t have the oem lights. The 4th light has been wired in since I’ve had the car and hasn’t created any issue. So I don’t know. I’m wondering if maybe third brake light went out and that is causing the issue.
I haven’t tried it yet. Will see.
No just flashing back to stock so Forscan will work. Then flash BCM with Forscan. So have aftermarket euro style taillights with diode dynamic sequencers. Also have led side markers and an aftermarket 4th light at bottom of bumper that is hardwired into taillights. Everything was good then lost...
Does anyone have access to stock tune for the 2018 Mustang GT. Having light issues and need to update BCM firmware but afraid the “stock” tune I have access to isn’t actually stock and therefore may not be able to get Forscan to connect.