You've installed your new lights, and something isn't quite right: the turn signal blinks fast, the dash says a bulb is out, or the DRL shimmers at idle. Good news first: each of these has a known cause and a quick fix, usually one connection step that didn't fully take.
Every RIGNOX headlight and tail light is built for a quiet dash, with CANbus decoders inside the assembly, and everything else needed to prevent hyperflash is included — built into the light or packed in the box. This guide gets you from symptom to fix fast, and if it doesn't, we'll sort it out with you.
Step 1: find your symptom
| What you see | What it is | Go to |
|---|---|---|
| Turn signals blink about twice as fast as normal | Hyperflash: the circuit reads too little current | Fix 1 |
| A "bulb out" or lamp warning on the dash | Same cause, reported by the vehicle's computer | Fix 2 |
| DRL or running light shimmers, pulses or flickers | The vehicle is pulsing that circuit | Fix 3 |
Hyperflash and bulb-out warnings are a current issue: fix them with load. Flicker is a signal issue: fix it with a clean ground and steady power. Knowing which one you have is most of the job.
Why it happens
Your vehicle checks its own bulbs. A halogen turn-signal bulb draws around 21 to 27 watts, and when that current drops, the car assumes a filament has burned out. Depending on the vehicle, the flasher relay or the body control module (BCM) reports it as a fast blink, a bulb-out message on the dash, or both. Many vehicles also pulse their lighting circuits to check a bulb is connected or to dim the DRL. A halogen filament is too slow to show those pulses; an LED is fast enough to show them as flicker.
An LED draws a fraction of a halogen bulb's current. The light is working perfectly. The vehicle just needs the right signal back, and that's what RIGNOX builds in.
What's already built in and in the box
- CANbus decoders, built into every RIGNOX headlight and tail light, give the vehicle the signal it expects and smooth out its check and dimming pulses.
- Hyper-flash protection, built into the light or packed in the box, works with the built-in CANbus decoders to keep the flash at the factory rate, with no dash codes. They plug in where your installation guide shows: no cutting, no splicing, no tapping into factory wiring.
- Adapter harnesses, included where your vehicle's lighting plug differs from the lamp's.
So when one of the symptoms above shows up, the fix is almost always making sure these parts are connected the way the installation guide shows.
Fix 1: turn signals blink fast (hyperflash)
Cause: too little current on the turn-signal circuit. Fix: the hyper-flash protection that came with your lights.
- Test with the turn-signal stalk, one side at a time. Hazards often run through a different circuit and won't show hyperflash, so they don't tell you anything here.
- Both sides fast? If your kit came with plug-in resistors, plug one in on each side, where your installation guide shows. Mount each one on a metal surface, away from plastic, paint and wiring, and don't wrap it in tape: load resistors get hot to the touch when the signal is on. That's normal, and it's why they mount on metal.
- One side fast? Re-seat that side's connector (and resistor, if your kit has one) until they click. A plug that's 90% in is a common cause, and it's a ten-second fix.
- Older vehicle with a plug-in flasher relay? An LED-compatible electronic flasher relay also sets the correct blink rate.
Fix 2: dash says a bulb is out
Cause: the same low-current reading, reported by the BCM. Fix: check the hyper-flash protection that came with your lights, then let the BCM recheck.
- If your kit came with plug-in resistors, plug them in and check every connector is clicked home.
- Give the BCM time to recheck. Many vehicles keep the message until a few ignition cycles or a short drive have passed.
- Still showing? Disconnect the negative battery terminal for 30 minutes, then reconnect. This clears the stored bulb state on many vehicles.
- Message names a lamp you didn't replace? A neighboring connector was likely bumped during the install. Re-seat it.
Fix 3: DRL or running light flickers
Cause: the vehicle is driving that circuit with a pulsed (PWM) signal, usually to dim the DRL when the headlights come on. The built-in decoder smooths the PWM pulses, but it needs solid power and ground to do it. A weak ground lets the pulses through as flicker, so clean the ground first.
- Check the ground first. Remove it, clean to bare metal, retighten. Paint and undercoating don't conduct, so a weak ground is the first thing to check for any intermittent LED behavior.
- Flicker only at idle, gone when you rev? Check the battery terminals: it's usually alternator ripple showing through a marginal terminal connection.
- Started after a dealer visit? Re-seat the connectors and do the 30-minute reset; if it continues, send us a video and we'll sort it out.
Before you contact us: three quick checks
- Every connector (and resistor, if your kit has them) is fully seated and latched.
- Every ground point is bare metal and tight.
- You tested the turn signals with the stalk, one side at a time.
Still not right? We'll sort it out
Send us these and we'll pinpoint it:
- A 15–30 second video of the symptom, engine running (turn signals one side at a time; for flicker, at idle and with a light rev)
- A photo of the dash message, if there is one
- A photo of each connection at the lamp (resistors too, if your kit has them), and of the ground point
- Your order number, year/make/model/trim, and whether the headlights and tail lights on this vehicle are both RIGNOX
We reply within 1 business day and ship whatever your vehicle needs. Sending those details together helps us give you a clear next step in our first reply.
The short version
- Hyperflash or bulb-out message: plug in the resistors if your kit came with them, click every connector home, then let the BCM recheck or reset it with the battery.
- Flicker: clean the ground to bare metal, check the battery terminals.
- Test turn signals with the stalk, not the hazards.
- Every RIGNOX LED light has CANbus decoders built in, and everything else needed to prevent hyperflash is included — built into the light or packed in the box: no cutting, no splicing.
The connector and mounting steps for your vehicle are in the RIGNOX installation guides. Seeing moisture in the lens instead? That's a different topic: normal fog or a real leak.
Planning a lighting upgrade for another vehicle? Match your vehicle and factory setup in RIGNOX headlights or RIGNOX tail lights.
