QuickDtc.Com
Volvo D13 Headlights Are Not Working — What To Check
If your Volvo D13 headlights are not working, the first thing you need to think about is your safety, not the fix. I’ll walk you through the real causes and how to check them, but read the warning below first before you do anything else.
⚠️ Warning — Read This First
If it’s dark outside and your headlights are not working, do not keep driving. Pull over and park the truck in a safe place right away. Turn on your 4 way flashers so other drivers can see you, and call the police for assistance and towing. Your safety and the safety of other drivers on the road comes first. Once you’re parked safely, you can move on to checking the truck.
1. Don’t Waste Time Looking For Headlight Fuses
A lot of people pop open the fuse box right away and start hunting for a headlight fuse. On Volvo trucks, there is no separate fuse just for the headlights, so you won’t find one no matter how long you look. What you need to check instead are the fuses for the Light Control Module. This module is what controls power going out to your lights, so if one of its fuses is blown, your headlights can go out completely even though there’s no actual “headlight fuse” involved. Go through each fuse related to the Light Control Module and check them one at a time. Pull each one out and look closely for a broken wire inside or any burnt marks.
2. Check The Main Connector Near The Left Headlight
Open the hood and look near the left side headlight. You’ll see a big connector plugged in close to it. This connector carries power and signal to your headlights, so it’s worth checking closely. Make sure it’s fully pushed in and locked, and look for any pins that look bent, pushed back, or corroded. Sometimes vibration from the road or a recent repair can knock this connector loose just enough to cut power to the lights without it looking obviously disconnected. Give it a firm push to make sure it’s properly seated.
3. Check For Voltage If You Have The Tools
If you have a multimeter or test light with you, this is a good time to use it. Check for voltage at the connector and at the fuses you already looked at. This tells you whether power is actually reaching the headlight system or stopping somewhere along the way. If you don’t have tools on hand, that’s okay, just move on to the next step.
4. If Everything Looks Fine, The System Likely Needs A Reset
If you checked the fuses, the connector looks good, and your voltage reads fine, then in my experience it’s about 99% likely your system just needs a reset. This happens more often than people expect on these trucks. The good news is the fix is simple and doesn’t need any parts.
5. How To Reset The System
First, turn off all your light switches inside the cab. Then find your main power switch. This is usually located on the batteries, or inside the truck on the driver’s seat side, near where you step in to enter the cab. Turn that main power switch off completely. Now just wait. Leave everything off for 15 minutes to give the system enough time to fully power down and reset itself. Don’t rush this part, the full 15 minutes matters.
Once the 15 minutes is up, turn the main power switch back on. Turn your headlight switch back on and check. In most cases, your headlights will be working again at this point.
Frequently Asked Questions
Why are my Volvo D13 headlights not working but other lights are fine?
This usually points to a blown fuse on the Light Control Module, a loose connector near the left headlight, or the system needing a reset. It’s rare for it to be a wiring problem if your other lights are working normally.
Where is the main power switch on a Volvo D13?
It’s usually located on the batteries themselves, or inside the cab on the driver’s side, close to the step you use to climb into the truck. Check both spots since placement can vary slightly by model year.
How long should I wait when resetting the system?
Wait a full 15 minutes with the main power switch off. Cutting it short can stop the modules from fully resetting, and you may end up with the same problem right after turning it back on.
What should I do if my headlights go out while driving at night?
Pull over in a safe spot right away, turn on your 4 way flashers, and call the police for assistance and towing. Don’t attempt to keep driving or try to fix it on the side of the road in the dark.
Disclaimer
Electrical diagnostics and repairs should only be performed by a qualified, licensed mechanic. Working around batteries, fuses, and connectors can be dangerous if not handled correctly. If you are a driver performing a basic visual check, always do so in a safe, well lit area away from traffic, and wear safety boots and safety glasses. If your headlights fail while driving at night, prioritize pulling over safely and calling for help before attempting any inspection.
