Skip the auto shop - Our mechanics make house calls

Q: Headlights stop functioning after starting SUV

asked by on

When I activate the headlights, they stop functioning after I have started my SUV. I went to an independent mechanic and he replaced the lamp control relay fuse. He has done this two separate times. He also reported that there is damage to the fuse box and that the head lamp driver module has melted. Fortunately, it did not cause a fire, nor smoke. Before proceeding with more replacements, I would like your assessment since the lamp control relay fuse has already had to be replaced “twice.” Thank you.

A: Hi there, thanks for writing in about your ...

Hi there, thanks for writing in about your 2008 Saab 9-7x. The circuit protection devices are trying to warn of an issue in the system. The rest of the electronics along the lighting circuit must be inspected to prevent further damage. Something had to go wrong in order to melt and electronic module. Common finds are faulty light bulbs and malfunctioning modules. If you would like to have this checked out, a certified technician from YourMechanic can inspect the headlights at your home or office in order to pinpoint the problem and conduct a repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Fuel Pump replaced now car won't start 2007 Saab 9-3

Hi there - the story certainly doesn't make sense. Excessive fuel pressure won't "ruin an injector", although it will certainly leak and cause high fuel consumption, as well as a rough idle and rough running. Check for problem codes, whether...

Q: Does 4k seem reasonable to replace the wiring harness on a 2011 Jaguar XJ?

I think you should get a second opinion on this. The wiring harness should be trouble free unless something has happened to damage it. Accidents, fires, water damage, salt corrosion, or electrical overloads can damage a wiring harness, but you...

Q: Headlights independently fail and SUV shuts down

Any time bulbs are replaced, they must be done so in pairs. Especially high powered headlights. The module driving the lights or the switch may be experiencing a malfunction. I recommend having another expert inspect the electrical circuit for any...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...