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Seat belt warning light and chime constantly on

Windy_Miller

Guest of the Club
Got in my car to return from Porches on the Prom and the seatbelt warning dash light and ‘bing-bong’ chime came on (despite both belts being clipped in)- thankfully the chime stops after 2 minutes, or it would have driven me mad for 4hrs driving back.

But it every time I switch off, get out, and then get back in and turn the ignition and drive off over 10mph it starts again.

Ive clipped in both belts, it makes no difference.

I think its he drivers side as there’s obviously the weight of me on the seat upon starting up (and seat belt clipped in).

The seat belt ‘receiver’ attached to the seat has a wire connected to it.

So, I’m assuming either this wire is damaged (resulting in an open circuit that causes the chime), or the receiver itself is damaged.

Anyone experienced similar?

Is it possible to replace the wire /
receiver alone? Is it a seat out job?

Thanks in advance

Jason
 
Jason,

Sorry I can't help with a definitive answer to your questions but there's bound to be a connector somewhere close to the belt clip. Try breaking and remaking the connection to see if that clears the fault. If that doesn't help then running some suitable diagnostics (PIWIS or equivalent) should point you in the right direction.

Jeff

 
Thanks Jeff.

I’ve unshipped the yellow connections housing from under the seat and then disconnected it. i identified the seat seat belt receptacle cable in the loom, and which 2 pins the blue and yellow cables go to.

Ive continuity checked between the pins both with the seat belt clipped in, and out, of the receptacle. In both instances it reads 400ohms. So there’s resistance there whether the belts clipped in or not. I’d have expected there to be nil resistance (ie total continuity) with the belt clipped in.

Interestingly, I’ve started the car without sitting in the seat, with the belt clipped in and it still gives me the warning.

And, with the yellow connector disconnected I get no seat belt warning, but I also lose electric seat adjustment.

Which makes me think:

1) the seat ‘thinks’ someone’s sat in it even when not

2) the belt receptacle is not registering when it’s clipped in

Strange / low probability that both functions would ‘fail’ simultaneously...

i can’t see anything under the seat that is the actual ‘load sensor’ for someone sitting in it 🧐🤔

Now considering a new seat belt receptacle (with cable loom), and/or load sensor in the seat.

Or see if there’s a way to ‘kill’ the warning function as I never drive without a seat belt anyway.

 
Sounds as though you're on top of it Jason.

That's the snag with electrics - either you try swapping out components in an attempt to cure the problem or you run some diagnostics to go straight to the source of the problem.

Hope you get it sorted - 2 minutes of futile chiming must be driving you mad..!

Jeff

 
This is total guess work: If the buckle sensor wires reads 400ohms no matter if the belt is clipped in or not the contacts in the buckle must be to blame. I would expect the resistance to reduce or drop to zero. Is this the case for both seats? If not then maybe contact cleaner may help or new buckle for the offending side.

 
Hi Geoff,

you could be right, I’ll try and clean out the buckle with WD40.

Strangely the passenger side doesn’t have a wire fitted to the buckle to make a comparison with.

Ill report back later.

 
You don't say which model of Cayman. Are you sure the passenger seat has a weight sensor? My 997 doesn't. That may explain why there is no wire to the buckle that side. As previous posts it sounds to me like the problem is within the buckle.

 
Hi, it’s a MY2010 987.2 Cayman S.

The passenger seat belt buckle has no lead coming out of it, so perhaps it has no warning function.

For now I’ve disconnected the seat belt buckle lead from a yellow connector attached under the drivers seat. This has ‘killed’ the seat belt warning light and bing-bong chime, but now I have an airbag warning light....! 🙄😠

 
Might be better to use electrical contact cleaner over wd40 as it tends to evaporate and dry “clean” whereas wd40 may run the risk of oily residue and staining.....

 

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