Seatbelt Warning Light

[Wagon Sailor]

The flashing red seatbelt warning light in our 240 has become more irritating, in that it won't switch off. We've tried running it with all belts connected, but it makes no difference.

Is there a quick fix?

[Stephen Edwin]

Have you tried removing the bulb?


If I remember correctly that is what worked for me.



.

[Bob Meadows]

Some information:~
https://www.volvoforums.org.uk/showthread.php?t=77221

[Stephen Edwin]

Originally Posted by Bob Meadows

Some information:~
https://www.volvoforums.org.uk/showthread.php?t=77221

Thank you.

I see Wooble said remove both bulbs. I thought that was what I have done successfully on all my Volvos.



.

[Wagon Sailor]

Thanks for the responses.
The thing is, I'd like it work when it's supposed to and not flash all the time even in if seat belts are correctly buckled. Removing the bulb won't do this.

(Curiously, it behaved properly today.)

[Othen]

Originally Posted by Wagon Sailor

Thanks for the responses.
The thing is, I'd like it work when it's supposed to and not flash all the time even in if seat belts are correctly buckled. Removing the bulb won't do this.

(Curiously, it behaved properly today.)

An intermittent fault: in that case it sounds like it is probably a poor connection in one of the sensors in the seat belts (I'm guessing the driver's one as that gets most wear). A random spray with some contact cleaner might solve it?

I'll look up the wiring diagram after walking Bob, there should be somewhere to access the wiring so you could short each one with a jumper to isolate the problem.

Alan

PS. Back from walking Bob: I'm not sure whether this diagram will be helpful or not, it is for the 1981 MY (I think your motor car is later). It shows there is just one sensor - and that is for the driver's seat belt alone - if that is the case it should be pretty easy to find the fault.



I note from this diagram the light and buzzer are supposed to go out after 8 seconds - but I think you said yours does not. In that case it seems most likely that the relay has failed, rather than the sensor in the drivers seat belt.

The relay is clipped under the steering wheel:



Good fortune,

Alan

PS. If your car is much later than 1981 the wiring diagram may not apply, but in general I don't think the arrangements changed much over 30 years.

[Bob Meadows]

Once it is fixed: ~ the dummy blanking belt clip is useful- just push in if you are working on the car etc. Quite cheap on eBay some may require the plastic reshaping a little where it plugs into the holder (fitted to an ’88 240)
Bob

[Othen]

... further to the above, I've just had a look at the set up for the RB.

I didn't take it apart to have a look, but I'm guessing there must be a microswitch in the seat belt stalk such that the tongue causes to make an open circuit to earth. The handbook says this should work on both the drivers' and passenger's sides, but it only seems to work on the offside, so either the system is not fitted to the passenger's seat or it isn't connected there. Neither circumstance concerns me in the slightest, but I'm happy it works on the driver's side.

The light doesn't go off after 8 seconds as the manual suggests it should, nor does the buzzer operate (except when the driver's door is open with the ignition on, as it should), so either the RB's set up is different to the green book (quite possible) or the 40 year old relay is not working exactly as it should. Again, neither circumstance concerns me in the slightest and I won't be searching for a problem that probably doesn't exist.

I'm thinking the best way of finding the source of the problem would be to remove the single bolt holding the seat belt stalk, somewhere under there should be a wire - an open circuit should extinguish the light (I'm guessing, but I can't think where else the switch would be). If it isn't that it probably has to be the relay that is kaputt.

Good fortune,

Alan

[140]

Check the pressure switch under the passenger seat it may of come unclipped or need adjusting

[Wagon Sailor]

We never got to the bottom of the problem, but now it's moved on. There seems to be a partial blockage, in that the driver's seatbelt tongue no longer fits in the receptacle. It will fit in the passenger clip, though.

I think we might need to replace the "stalk".