Skip the auto shop - Our mechanics make house calls

Q: Quits running multiple times

asked by on

The car wouldn't start this morning. But I was able to open the door with the remote control and turn on the power, but there wasn't any display or radio. I got a jump from my neighbor and the car was working OK. But later on the remote wouldn't open the door again the horn was making a short soft honk every few seconds. I saw that the horn relay in the engine fuse box was blinking a green light and pulled it. I got another jump for my car. But then it quit again later on not too long after it was jumped. The horn was honking and the relay was blinking again, so I pulled it. The car went dead yet another time. I just remembered that a few weeks ago I left the car power on for 3 hours. I wondered if that was causing all the problems. I hope it’s only the 12 volt battery and not something major. What do you think? Do you have any ideas?

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

Hey there, thanks for writing in about your 2010 Lexus HS250h. Your problem is most likely the power integration relay/module (what you're referring to as the horn relay). The component is used to supply power to the horns, keyless entry system and all kinds of other stuff. It can also prevent the vehicle from starting if it is drawing energy from the rest of the system. I suggest having a professional, such as one from YourMechanic, test the cause of the no start and replace the horn relay if necessary.

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・Save up to 30%

Get a quote

What others are asking

Q: No sound from the stereo system

The most common cause of the radio not having volume in the way you have described is that the radio is failing. Other possible causes are the speakers have failed, or a wiring issue. A qualified technician such as one...

Q: Security light flashes when key is in key lock

Hey there, thanks for writing in about your 2001 Lexus ES300h. This problem needs a professional mechanic trained in Lexus security and immobilizer systems to diagnose and resolve this problem.

Q: Computer taken out by close lightning strike.

[The National Lightning Safety Institute]((https://weather.com/storms/tornado/news/what-happens-when-lightning-hits-car-20140625) reports that some vehicles struck by lightning experience external damage, including pitting and arcing, as well as internal damage to electronic systems and components. It is pretty likely that an electric pulse from the lightning...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.