Had the 12v disconnected, now the brake and turnsignal honk at me.

[Arian]

So i now own my first car that doesnt have an analog dashboard and its all very confusing. During a cold spel i brought in the 12v battery for a spell to warm up since the car wouldnt turn on(dash said half charge but after a start up attempt it dropped to empty) Turns out it was something simpler and not an issue, just me living in the last century.

However, when reconnecting the battery the big red plastic covered thing that bolts onto the regular connector it made a honking sound. And now any time i depress the brake or use my turn signal it makes that honking from the back of the car.... I searched the forum for an answer but any thread talking of strange noises seems to mention very different sounds, this isnt mechanical, it sounds like a tiny car horn going off in the trunk.

It didnt do this before.

Its from 2014

 

[PHEV07]

So i now own my first car that doesnt have an analog dashboard and its all very confusing. During a cold spel i brought in the 12v battery for a spell to warm up since the car wouldnt turn on(dash said half charge but after a start up attempt it dropped to empty) Turns out it was something simpler and not an issue, just me living in the last century.

However, when reconnecting the battery the big red plastic covered thing that bolts onto the regular connector it made a honking sound. And now any time i depress the brake or use my turn signal it makes that honking from the back of the car.... I searched the forum for an answer but any thread talking of strange noises seems to mention very different sounds, this isnt mechanical, it sounds like a tiny car horn going off in the trunk.

It didnt do this before.

Its from 2014

Very strange indeed.

You stated that tgd original problem was something simple and not the battery.

Can you please elaborate on what the original problem was?

 

[Arian]

Very strange indeed.

You stated that tgd original problem was something simple and not the battery.

Can you please elaborate on what the original problem was?

trying to start the car with the charger plugged in i got every single error message imaginable and the ICE wouldnt start, display took ages to start up. Warmed up the 12v as i would do on my old diesel. Display came on as normal but still error messages and no ICE (also locked out of shifting gear) unplugged the charger and voila car started as normal. Since then same thing, car wont start with charger plugged in but starts fine of charged and unplugged.

No idea if that is normal, i just got it and my only knowledge is of old volvo diesels

 

[DaveL59]

The honking is likely the reversing audio alert if your car has that fitted. Is it possible you've crushed or snagged a cable in the boot area when you removed and refitted the battery?

You'd only expect that to come on with the reversing light, normally, so worth checking (or getting someone else to) if that Is coming on when you hit the brake or turn signal. Perhaps a canbus reset will be needed.

 

[Arian]

would that sound like a muted horn? basically the same sound as the main horn but softer. it goes toooot when i brake and toot toot toot when using the turn signal. It also seems to randomly turn on and off. Il check for the cables but nothing should have been moved, i was careful to leave everything as it was. I noticed it made the honking sound as well when putting that second connector with the red plastic cap back on.

 

[PHEV07]

trying to start the car with the charger plugged in i got every single error message imaginable and the ICE wouldnt start, display took ages to start up. Warmed up the 12v as i would do on my old diesel. Display came on as normal but still error messages and no ICE (also locked out of shifting gear) unplugged the charger and voila car started as normal. Since then same thing, car wont start with charger plugged in but starts fine of charged and unplugged.

No idea if that is normal, i just got it and my only knowledge is of old volvo diesels

The Mitsubishi Outlander PHEV will not allow starting the vehicle with the Charging Cable plugged in.

 

[Arian]

The Mitsubishi Outlander PHEV will not allow starting the vehicle with the Charging Cable plugged in.

yea that turned out to be the original issue, hence no need to even warm up the 12v, was a dumb thing done from old diesel logic. I know now so no issue there, the issue is that since reconnecting the battery it makes that honking noise on braking and turning

 

[PHEV07]

yea that turned out to be the original issue, hence no need to even warm up the 12v, was a dumb thing done from old diesel logic. I know now so no issue there, the issue is that since reconnecting the battery it makes that honking noise on braking and turning

Disconnect the Cable clamp from Negative Battery Terminal. Leave off for one minute and attach again.

See if the horn keeps honking at you.

If it does, check to see that both brake lights illuminate when brake pedal is pressed and turn signal lights come on when the turn signal is activated.

Sounds like the horn circuit relay is energizing when rear lights come on.

Might be a faulty fuse, but not certain yet.

 

[Arian]

Disconnect the Cable clamp from Negative Battery Terminal. Leave off for one minute and attach again.

See if the horn keeps honking at you.

If it does, check to see that both brake lights illuminate when brake pedal is pressed and turn signal lights come on when the turn signal is activated.

Sounds like the horn circuit relay is energizing when rear lights come on.

Might be a faulty fuse, but not certain yet.

it just went away on its own this morning. Perhaps this mystery will remain unsolved. If it happens again il try that but iam not touching it anymore unless i have to, nearest professional is hours away so iam often resigned to DIY. If there is one thing i hate about the car its that its inner workings appear to be above my paygrade, but thats a "me" problem not a car problem. Il continue reading along on the forum to learn what i can.

Oh and yes all lights came on as normal while it was happening, The honking went in synch with the lights infact. I may have some more questions but those deserve a seperate thread, mainly i would like to find some way to disable the beeping sound when opening my trunk. Taking out my rifle shouldnt be alerting every moose in the area

 

[Zulu67MP]

Does it have - or have had - a towbar fitted? If so, check for a signal-sound- repeater box as that may be what's honking.

 

[kernelpanic]

I see from your first post that it's a 2014.
Take a good look at all the earth/ground connections to the body. rear lights, whereever they get their ground from.
Older cars often end up with iffy ground connexions, it can manifest as some strange things like brake lights going on and off instead of indicators and other strange stuff. You car is the right age to potentially have this sort of problem, check the horn earth, in fact any earths you can find or think of. Try a bit of sandpaper (emery paper for some) to clean up connexion surfaces.

 

[Arian]

I see from your first post that it's a 2014.
Take a good look at all the earth/ground connections to the body. rear lights, whereever they get their ground from.
Older cars often end up with iffy ground connexions, it can manifest as some strange things like brake lights going on and off instead of indicators and other strange stuff. You car is the right age to potentially have this sort of problem, check the horn earth, in fact any earths you can find or think of. Try a bit of sandpaper (emery paper for some) to clean up connexion surfaces.

That actually makes sense, as a sound technician i should have thought of that. For now the issue just went away on its own so i wont touch anything else until i have a better idea of how everything works. I do miss my old v70 in these cases, no chips to speak off and runs on the 1,00/L heating oil they sell here (essentially red diesel) But with tax being what it is here owning a pure combustion vehicle costs more standing in the barn than my outlander costs me driving around (90 euro tax and 2 months on a single tank) Lets hope the old batteries survive the lappish winter, iam a bit worried of getting stranded while out hunting.

 

[Daixiwen]

Does it have - or have had - a towbar fitted? If so, check for a signal-sound- repeater box as that may be what's honking.

I was about to say the same thing, I had a trailer with a ground fault, meaning that none of the lights worked, and then I had a soft honk coming from the back, synchronized with the brakes or the turnsignals. If you have that same box fitted to your car it may think that you have a trailer connected, with non working lights.

 

[Arian]

I was about to say the same thing, I had a trailer with a ground fault, meaning that none of the lights worked, and then I had a soft honk coming from the back, synchronized with the brakes or the turnsignals. If you have that same box fitted to your car it may think that you have a trailer connected, with non working lights.

I do have a towbar etc. Cant really go moose hunting without a trailer Could be possible. Oddly it went away on its own and hasnt returned. So perhaps il never know for sure.