Skip the auto shop - Our mechanics make house calls

Q: Electrical problems with keyless entry, headlights and radio

asked by on

I've been using the keyless entry but it wouldn't work correctly and open all doors. I changed the batteries and tried but it still didn't work right. I turned the car on with the secondary key. The headlights didn't work and the radio was randomly going off and on. These issues don't happen when the car is warmed up. What should I check first?

A: Hello. We will be happy to assist. The prob...

Hello. We will be happy to assist. The problem you are experiencing is common. The symptoms you have are identical to many other SL500 owner complaints. The component which causes all the misbehavior is the EIS (Electronic Ignition Switch). Symptoms of a faulty EIS include SRS light illumination, rollbar light illumination, radio flickering, headlights not working, or no start conditions. I'd recommend having a certified technician diagnose the electrical issue with these components and test the EIS to help determine what the problem is.

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: Sliding door not closing.

The door is on a track and on rollers in that track. If the track is blocked or the rollers are broke could bind the door. The door has several safety items that cannot tell the difference between someone in...

Q: Loud snap when closing window

Hello. If you heard a loud snap and your window is no longer working, that is probably a sign that the motor or regulator have failed. The snap you heard may have been a piece of the motor breaking, or...

Q: Soft close trunk feature not working

This is a common issue on your car. Most of the time it is caused by a programming issue. The rear module needs to be reprogrammed to fix this. If the problem continues then the contact sensors may have failed....

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...
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 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...