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Pothole Triggered Hazards?


Paddy_SP

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I was driving home from a pest control session late the other night when I hit an unseen pothole. There was an almighty crash as my HD suspension did its job, but the bang set my hazards off. Since I was about to drive through a town centre with firearms on board, I didn't want to attract any unnecessary attention. I therefore pulled over, switched the ignition off, and started the old girl back up again. Luckily, all was fine, but it still concerns me - rather than have it happen again, I'd like to trace the cause - if anyone would be kind enough to point me at things to check, I'd be most grateful!

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I think the sensor on the bulkhead cuts the fuel and triggers the hazards after an impact, why it didn't cut the fuel as well if it was that I don't know.

The only other thing I could imagine is that a relay got a big knock and managed to connect, the keep current is a lot lower than make, IIRC, so it may have stayed in until ignition was turned off.

Just educated guessing though

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then you can unplug the inertia switch and bridge the pins in the plug... then it will not trigger the hazards either... though all that "junk" was conceived for your(and the passenger's) protection as to not end up stuck in case of an accident in a car with the fuel pumped over god knows what short circuits ... God forbid

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In my Classic 300TDi, the inertia switch is integrated in the alarm ECU. I had this problem a few times on speed bumps, gradually became worse. Eventually traced it down to the alarm ECU having come loose, which allowed it to move separately of the car, and triggering much more quickly.

On my LHD it was on the passenger side behind the glovebox.

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  • 2 weeks later...

As above the crash inertia sensor has tripped by the bump u had, it's a safety feature incorporated in your security system, if your doors had be locked they would have unlocked also, it does not cut off the fuel supply, that's a separate item.

Why not read the owners handbook all the info is there.

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  • 2 weeks later...

I had the same problem in my Disco until I removed the offending device and settled for opening the doors with a key rather than with the remote.

The electronic alarm module has an impact sensor built into it, this "safety feature" allows for accidents/collisions and if such an occurrence happens the impact automatically opens all the door latches and switches on the hazard lights, the only way of resetting this is, as you did, to turn off the engine and restart. Turning it off resets the module.

On badly corrugated desert roads I was having to turn the bloody ignition off/on every 500 metres so I removed it.

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