Q: Both turn signals stopped working at the same time

asked by on October 29, 2015

I was driving home from the other day in my 2006 Ford Fusion when my turn signals suddenly stopped working. I previously had problems with the handle not staying in position until the car has turned, but I just held the handle in place a second longer and that did the trick. This was a totally different problem. Assuming all the bulbs didn’t just go out at the same time, what would cause the turn signals to totally stop working?

It seems everywhere we look in the digital age, a computer is performing a job or task that used to be carried out by conventional means. In the case of your turn signals, what was once a simple fuse box is now called a “Smart Junction Box”. The SJB is responsible for receiving requests from the driver, and performing tasks that are associated with the command. In older vehicles, when the driver (You) moved the turn signal lever, the switch physically connected the related circuits and voila - there was light! Now, when the driver (You) moves the turn signal lever, you are sending a request to the SJB (HAL) for light activation. If the SJB (HAL) decides that any parameter is incorrect, or if HAL experiences a catastrophic failure, the lights remain off and you turn at your own peril. Each year, it seems more and more functions are integrated into these modules, and as a result, more failures become prevalent.

While these failures are fairly common, it would be wise to have a technician confirm this is the case. I strongly recommend having the vehicle inspected by a qualified technician with a diagnostic scan tool. The technician can then retrieve any potential trouble codes, perform output tests, and confirm that all of your turn signal bulbs did not in fact decide to go on strike. If SJB replacement becomes necessary, costs can vary widely because reprogramming at the dealer is typically necessary. In any case, proper diagnosis is crucial. As an aside, it is very possible that your previous concern of the turn signal stalk not holding position will still be present, and may have to be addressed with the physical switch being replaced. Once again, the technician can make that determination on site.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Can you please assist me regarding my ford bantam 2004 model 1.3 xi. It does not start when its raining or partly cloudy.

Hi there. Usually electrical issues are common when it is wet out. I recommend replacing the spark plugs as they are not producing enough spark for added moisture in the atmosphere. Then check all of the ground wires to the...

Engine is knocking loudly and has a weak acceleration.

You may have damaged the engine bearings by running it low on oil. I would suggest not driving it until you have an engine mechanic listen to and diagnose where the noise is coming from. If the noise is up...

How much would a motor mount replacement cost at Goodyear?

Hi there: A vehicle vibration while the stopped can be caused by multiple issues, ranging from improperly running engine due to a vacuum leak, ignition system or fuel system issues, or faulty or loose motor mounts. In regards to how...

Related articles

2012 Ford Escape vs. 2012 Honda CR-V: Which One Should I Buy?
SUVs represent one out of every three vehicles sold in 2012, making them one of the most-purchased types of vehicles in the country during that time period. Compact SUVs are a sub-class that are slightly smaller and offer the most...
The Top 10 Most Problematic Cars
All cars have issues, from grinding brakes to gasket leaks. The Ford Explorer's and Honda Civic's bad transmissions rank them as the most problematic.
How Car Keypad Locks Work
Pioneered Pioneered by Ford, keypads let you lock, unlock without keys Pioneered by Ford, keypad door systems began appearing on high-end car and SUV products in the early 1980s. Ford took advantage of the then-new digital computer revolution – the...