The Problem: "One Several Output Has Short Circuit Lights" Error
If you own a BMW F-Series (such as the F30, F32, F20, or F15) and recently replaced a blown bulb, fixed a damaged wire, or installed aftermarket LEDs, you might be facing a very frustrating issue. Even with a brand-new bulb and perfect wiring, the light refuses to turn on.
When you scan your vehicle with an OBD2 scanner, you get the dreaded error code (usually 8041B6 or 804871). Many owners search the internet for why their f30 one several output has short circuit lights remain completely dead.
Understanding the BMW FEM and REM Short Circuit Lock
Unlike older cars with traditional fuse boxes, modern BMWs use smart modules:
- FEM (Front Electronic Module): Manages front lights, turn signals, and interior components.
- REM (Rear Electronic Module): Manages tail lights, reverse lights, and trunk electronics.
If these modules detect a short circuit multiple times (usually 50 cycles) due to a bad bulb or exposed wire, the module permanently locks the power output to that specific line to prevent a fire hazard. Simply clearing the Diagnostic Trouble Codes (DTCs) will NOT unlock the module. You must reset the internal short-circuit counter.
The Old Way vs. The Modern Solution
In the past, performing a bmw fem short circuit reset or a bmw rem short circuit reset required a Windows laptop, an ENET cable, and complex factory software like Tool32 or ISTA-D to inject hexadecimal codes.
Today, if you are looking for a fem short circut reset or a rem short circut reset (as it is often typed online), you don't need a laptop. You can do it directly from your Android smartphone using the DiagBimmer App via UDS protocols.
Step-by-Step: How to Reset BMW Short Circuit Counter with DiagBimmer
- Fix the Hardware Issue: First, repair the damaged wire or replace the faulty bulb. If the physical short circuit remains, the module will lock it again immediately.
- Download the App: Get the DiagBimmer App from the Google Play Store.
- Connect to Your BMW: Plug your OBD2 adapter (ELM327, vLinker, OBDLink, or ENET cable) into your car. Turn the ignition ON (Engine OFF).
- Open Special Functions: Launch DiagBimmer, connect to the vehicle, and navigate to the Service / Special Functions menu.
- Execute the Reset: Select "Lamp Short-Circuit Reset" (or Body Short-Circuit Reset for trunk/KL15 lines). Choose whether you need to unlock the FEM (front) or REM (rear) module and tap reset.
- Clear Codes: Clear your DTCs, turn off the ignition for 30 seconds, and turn it back on. Your lights will now work perfectly!
DiagBimmer is a powerful, one-time purchase tool (no annoying subscriptions) that also offers DPF Regeneration, Battery Registration, EPB Service Mode, and ZF 8HP Adaptation Resets.