A bad headlight relay is among the more common reasons we see for low beam headlights not working while the high beams do. You see, the low and high beams each have their own relay, which is essentially an electrical switch. Like fuses, sometimes relays go bad.
Table of Contents
How do you fix a low beam fault?
- Find the blown out bulb.
- Buy the replacement bulb.
- Get your tools ready.
- Disconnect the negative terminal on the battery.
- Remove the trim pieces.
- Find the headlight holder.
- Disconnect the cables from the headlight.
- Remove the headlight bulb from the bulb housing.
What causes headlight malfunction?
Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don’t work or low beams don’t work. The cause: A burned out bulb, or a problem with the high beam switch or relay.
What would cause low beam headlights not to work?
Headlight Fuse or Relay If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.
Is there a fuse for low beam lights?
If your headlights have stopped working, locate the fuse in your car connected to the low-beam headlights circuit. The fuse box is typically located under the hood or behind the dashboard. You can often find this information in your owner’s manual or on the inside of the fuse box cover.
How do I know if my low beam relay is bad?
Headlights Don’t Turn On The most common sign of a bad headlight relay is headlights that don’t work. A headlight relay will typically fail in the open position, preventing voltage from reaching the headlights. If the low beam relay fails, the low beams won’t work.
How do you reset BMW headlights?

What is BMW Adaptive headlight malfunction?
The main cause for the failure of the adaptive headlight module is water. This can happen for many reasons, such as driving through heavy rain or flooding, or going through a car wash. When this happens, the adaptive malfunction error message will display on the dashboard of your BMW.
How much does it cost to fix BMW Adaptive headlights?
The Best in Auto Repair The average cost for a BMW 328i headlamp control module replacement is between $841 and $890. Labor costs are estimated between $186 and $234 while parts are priced at $656.
Does AutoZone replace low beams?
AutoZone can help you replace a burnt-out headlight bulb, but only if you’ve purchased the new bulb from their company, and only if the replacement doesn’t require any vehicle disassembly. Experienced AutoZone employees can help you with a simple replacementโbut AutoZone isn’t a stand-in for a professional mechanic.
Is there a fuse for each headlight?
Most headlight systems are going to involve a fuse, switch, relay, and bulb.
How can you tell if a headlight fuse is blown?
The blown fuse will be apparent because the wire element within will have melted or burned from the higher electrical current. You can also use a test light or a multimeter to identify the dead fuse without having to pull it out. Both tools are affordable and easy to use.
Where is the headlight fuse located?
They’re usually located in a plastic fuse box in the engine bay, and/or in the cabin.
How much does it cost to replace a low beam light?
The average cost for Halogen bulb for example is between $15 to $20 and an extra $50 for installation. According to an aftermarket auto part retailer, the cost per each High-Intensity discharge bulb replacement is $100 or more while the average cost of replacing an entire headlight assembly is ranges from $250 to $700.
How do I know if a fuse has blown in my car?

How do you check a headlight relay?

Should you replace both low beams at once?
Thankfully, most modern vehicles have more than one set of headlights. The secondary headlights, however, are not enough to carry a full beam in the darkness. For this reason, our mechanics recommend installing both lights when one goes out.
How do you fix a headlight relay?
- Materials Needed.
- Step 1: Locate the headlight closure relay.
- Step 2: Remove the fuse box cover or lid.
- Step 3: Remove the old relay.
- Step 4: Insert the new relay.
- Step 5: Test the headlights.
- Step 6: Reattach the fuse box cover.
How can you tell if a relay is blown?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
Can AutoZone test a relay?

What are the most common signs and symptoms of a bad relay?
Car suddenly stalls while operating: One of the most common symptoms of a failed ignition relay is a car that suddenly stalls while operating. If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system.
Do BMW headlights need to be programmed?
Yes it needs to be programmed since you installed different modules, the car does not know that. Okay thanks. So it’s normal that no light is coming on even turn signal? It’s a led headlight.
How do I reset my BMW electronics?

How do you hard reset a BMW?

What does headlight system error mean?
If it is not working properly it means you cannot turn the headlights on the car and it is required that you replace the headlight switch immediately to avoid any dangerous driving conditions. Sometimes, if moisture sits in the headlight it can hamper the performance of the bulb.