C4 playing a tune

[Vic Evans]

Every now & then when either hitting a bump or turning a corner quickly my wife's 2014 C4 Millenium, bought from new, plays a few musical notes.The onboard log shows 'no faults' & it can go for days between the 'musical interventions'. This has been happening for the last 6 months or so.
This morning she said that the airbag light stayed on & the tune played until she started the car .
Trouble is, she's not the most technical or observant person so I'm inclined to take what she says with a 'pinch of salt'.
None the less there's no doubt that some form of musical notes are played at times as I've witnessed them but in the absense of other indication of a fault put it down to maybe the dashcam but she assured me the noise was there when the camera was disconnected after it fell off the screen & she unplugged it.
The car is due for a dealer service soon so she can ask them to check but in the meantime;
Any ideas what it could be?

[Doo]

Every now & then when either hitting a bump or turning a corner quickly my wife's 2014 C4 Millenium, bought from new, plays a few musical notes.The onboard log shows 'no faults' & it can go for days between the 'musical interventions'. This has been happening for the last 6 months or so.
This morning she said that the airbag light stayed on & the tune played until she started the car .
Trouble is, she's not the most technical or observant person so I'm inclined to take what she says with a 'pinch of salt'.
None the less there's no doubt that some form of musical notes are played at times as I've witnessed them but in the absense of other indication of a fault put it down to maybe the dashcam but she assured me the noise was there when the camera was disconnected after it fell off the screen & she unplugged it.
The car is due for a dealer service soon so she can ask them to check but in the meantime;
Any ideas what it could be?

Without being there, it's hard to decide, but playing a tune sounds like the car is sounding an audible warning that something requires attention. It usually flashes up on the display screen (in my 12 plate Berlingo, the orange info screen will tell of various issues such as ABS & Traction Control for instance) telling what it is. It then returns to the standard screen showing time, temp, radio station, etc. But you can retrieve any messages by pressing menu & following through the various options. I think it's Vehicle Config then Diagnostics.... But it's all there. If you mess it up, just press menu again & scroll through the various options. The Diagnostics will tell you what it thinks is wrong.

[admiral51]

Just a guess but could it be a seat belt fastening issue or something on the seat registering as a person whilst being bumped around ?

Colin

[Doo]

Just a guess but could it be a seat belt fastening issue or something on the seat registering as a person whilst being bumped around ?

Colin

What with me having a wife, I'd hazard a guess at a heavy handbag

[admiral51]

I was just thinking of airbag light and seatbelt light symbols and the music:)
Drive it and un fasten the seatbelt ( obviously in a safe and secure situation ) and see if the noise is the same. Cheap and easy way to determine if it is the same noise

Colin

[Vic Evans]

Thanks for suggestions folks.
This morning the car wouldn't turn over with dash lights flashing when key turned to start.
The car's date & time was incorrect & flashing & my 'intelligent' CTEK MS5 5a charger showed battery didn't have enough charge. After about 3 hours it was showing full charge with car starting 'on the button' & charger diagnostics indicating battery condition OK. This is the first time in the vehicle's 8-9 years since new this has happened & usage has been normal. The onboard fault log indicated 'no faults' & all usual dash lights went out when engine started.
A 30km trip this morning was fine until arriving home & 'bumping' up a slope into the barn resulted in the now familiar tune.
It's possible (probable) that a couple of days ago my wife left the boot open after a foray to the garden center & shut it the next day without thinking so maybe the boot light dragged down the battery. Tomorrow will tell to see if the battery is holding it's charge.

[Vic Evans]

Didn't start again this morning. Battery voltage 11.7.
I've put it on charge again & arranged for local Citroen garage to check for faults on their computer & change battery this afternoon.
Hopefully it'll start & get me there.

[Vic Evans]

Charger showed battery fully charged but car wouldn't turn over/start.
Jumped it from my old Pug 806 & took it to local Citroen garage.
Owner said tune playing plus non starting almost certainly due to duff 8-9 yo battery but plugged in his machine, carried out diagnostic check & reported no faults.
Battery changed for new'un & all seems OK.
Will it still play a tune? Dunno but us'll see.

[Doo]

Charger showed battery fully charged but car wouldn't turn over/start.
Jumped it from my old Pug 806 & took it to local Citroen garage.
Owner said tune playing plus non starting almost certainly due to duff 8-9 yo battery but plugged in his machine, carried out diagnostic check & reported no faults.
Battery changed for new'un & all seems OK.
Will it still play a tune? Dunno but us'll see.

Bad battery will "always" create havoc with CanBus system. I have 2 Citroen's, a 2004 Jaguar XK8 and a 2000 Range Rover. All apart from Rover are full CanBus whereas the Rover is the 1st of the non CanBus fully reliant on many modules & a BECM, which needs special attention from a specific computer (Nanocom being one).

ALL of these cars are affected in various ways by corrupt signals. I just posted about wife's C4 having a bad high beam bulb, which brought in the need for the PAS pump to run constantly until ordered to stand down by my Autel MaxiPro comms reader.

The XK8 plays all manner of trickery as it sits for ages with no battery or a battery which went flat. Then I have to interrogate the system and erase up to 20 faults