Sorry to bump this thread from the dead but I ran across the same issue earlier today.
What's weird is I haven't changed anything electronically in my car for a while now so it I'm suspecting mine is also a wiring/ground issue. Will have it checked out by a technician later this week and report back on what's happening.
Electrical mods I have:
- HID (I have a 2015 FRS which comes with halogen standard)
- Switchback Turn Signals/Front Parking Lights
- LED front and rear Sidemarker bulb
- LED Turn signal bulb
- LED Map light
- LED Trunk Light
- Aftermarket relay for LED bulbs
- Dashcam hardwired in
I tried disconnecting them to no avail. I also tried disconnecting the headlight switch and issue persists when I put the key in accessory/on position
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