Oh no, airbag warning light!

[mjheathcote]

Glowing bright red in my instrument binnacle. Aargh!
I haven't disturbed anything recently, no flat batteries either.
So searching the forum it appears that only a SD2 reader can turn this off/reset.
To clarify, am I right in thinking that once the light is lit, even if the cause of the fault disappears, the light will not extinguish until reset with the SD2?
The reason why I ask is that while searching I found a post with the same problem on a similar vintage Ferrari, where the fault could possibly be the passenger airbag -end of dash- isolation switch, a weak point on our cars too it appears. In that case it suggested waggling the key to clean the contacts, then doing a battery isolation for 12 hours...
If the only cure is a SD2 reset, for the cost of a new switch (£20 it appears), is it worth just replacing this troublesome isolation switch before going to a dealer/specialist to reset, to save a potential second trip after replacing this switch, this having a high probability of being the cause of the problem?

Ta.

 

[ncslee]

It will need the SD2 to resort the light.

I think that theres an Alfa Part thats the same but the switch isn't that expensive anyway from Maserati

Make sure you clean up the contacts in the plug as these are know to cause problems

Lee

 

[BennyD]

The light will remain until the code has been erased. It could be your steering wheel 'clock Spring' as I had the same problem.

 

[Wack61]

I've got this now, left the car for 10 days while on holiday , came back,started ok but 2 minutes later both airbag lights on , the red one and the amber one that blinks fast then goes out, or used to.

bought a ctek to top the battery up, just took it out for a 30 min drive, isolated the battery so i'll see if that sorts anything out , if not i'll have to book it in with autoshield

 

[zagatoes30]

The switch that turns the passenger airbag light off is often the cause on 4200s. Clean the terminals and it may all be fine but you will still need an SD2 to reset once its triggered. It's only £30 to replace the switch completely which is what I had to do in the end.

 

[Wack61]

thanks for that, is it under the passenger seat

 

[CatmanV2]

Nope you can see it when you open the passenger door

 

[zagatoes30]

Nope you can see it when you open the passenger door

What he said

 

[Wack61]

thanks ill have a look in the morning

 

[CatmanV2]

thanks ill have a look in the morning

Problem is it might need an SD2 to reset.

C

 

[Wack61]

I think it will, pulled the connector off and back on and the blinky light has gone out but the red light has stopped on, might just swap it for a new switch if it's only £30 rather than pay to get the light put out to have it come on in a week or two, luckily it's just been MOTd so I could leave it for a bit to see if it comes on again

Thanks everyone, another cheap fix

anyone know how much autoshield charge to switch the light off

 

[Panicracing]

Happened to.me last week. Same thing for no reason, passenger/deactivation light came on then airbag warning light 2 minutes later. Dick Lovett put on SD2/3, switch failure. Replaced with new and Dick Lovett reset. Sorted. Looking at old switch was not fauty just needed cleaning. By the way both lights stay on until system reset, even after switch replacement.

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