300TDI hazards

9255 steve · Apr 21, 2024

I've noticed the hazard flashers switch on after going over rough ground or a large bump and can't be switched off until the engine is stopped. I'm wondering if this is a fault or some built in safety device, is it adjustable to be less sensitive I wonder. Thank you.

lynall · Apr 21, 2024

I think it is built in, I remember first time it happned on my old 200 disco as I drove into a ditch!

Anaconda · Apr 21, 2024

Don't some vehicles automatically switch on hazards when it registers its been in an accident, along with tripping the fuel cut off?
Related to that maybe?

D1Nut · Apr 21, 2024

mine did the same for many years till it wore out

while doing 60 on the road you just need to switch off while still driving and then on again a second later and it clears till the next time
no need to even take it out of gear

discool · Apr 21, 2024

9255 steve said:
I've noticed the hazard flashers switch on after going over rough ground or a large bump and can't be switched off until the engine is stopped. I'm wondering if this is a fault or some built in safety device, is it adjustable to be less sensitive I wonder. Thank you.

It should only be an issue when the vehicle has a very hard knock or bump as in an accident, there’s inertia switch which will signal the doors to unlock, if locked, and also set the hazards flashing.
To cancel, is by switching off the ignition switch and then back on… which you have already found.
But Inertia sensors can go over sensitive in time, if this issue keeps happening.

Don’t worry about the crash sensor fuel supply cut off, only the petrol D1s have that additional inertia switch.

9255 steve · Apr 22, 2024

discool said:
It should only be an issue when the vehicle has a very hard knock or bump as in an accident, there’s inertia switch which will signal the doors to unlock, if locked, and also set the hazards flashing.
To cancel, is by switching off the ignition switch and then back on… which you have already found.
But Inertia sensors can go over sensitive in time, if this issue keeps happening.

Don’t worry about the crash sensor fuel supply cut off, only the petrol D1s have that additional inertia switch.

Thanks for your reply you sound very knowledgeable, I wonder if you could direct me to the inertia switch location so as I can "adjust" it. Many thanks. If it helps it's a 1998 discovery 300tdi RHD. Cheers.

discool · Apr 22, 2024

9255 steve said:
Thanks for your reply you sound very knowledgeable, I wonder if you could direct me to the inertia switch location so as I can "adjust" it. Many thanks. If it helps it's a 1998 discovery 300tdi RHD. Cheers.

it’s a printed circuit board mounted component which is factory built for particular inertia spec for its application, and part of the vehicles security ECU PCB. It can’t be adjusted and it is a safety feature.

9255 steve · Apr 22, 2024

Thankyou for your help

discool · Apr 22, 2024

9255 steve said:
Thankyou for your help

You’re welcome

300TDI hazards

9255 steve

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lynall

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Anaconda

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D1Nut

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discool

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9255 steve

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discool

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9255 steve

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discool

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