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Old 2 Weeks Ago   #1
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Fuel pump inertia switch

2019 Ducato, can I cut into the wiring on this switch to add a hidden remote sucurity switch ? Concerned about Canbus
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Old 2 Weeks Ago   #2
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Re: Fuel pump inertia switch

It's not a physical switch these days it's tied into the airbag ECU (at least on most fiat cars)
A switch tied into the electric in tank fuel pump
power feed may be a better idea
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Old 1 Week Ago   #3
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Re: Fuel pump inertia switch

It is physical switch, in the passenger footwell
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Re: Fuel pump inertia switch

Simple way of checking would be to unplug the wiring loom to it and see if it still runs or not. If it doesn't then you should be able to tap into the wiring a locate a switch elsewhere to immobilise the car
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That's a maybe, it would be good to hear from someone who has actually done it without compromising the canbus system
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Quote Originally Posted by Brgjohn View Post
It is physical switch, in the passenger footwell
Strange vans must retain an actual switch while cars have it built into the computer
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Re: Fuel pump inertia switch

If the wiring and switch do not add any significant resistance, the Canbus will not know it is there.
The wires are likely to be just a feed in, and out to the pump. If you can find identical terminals, make up a loom to divert one wire to and from your switch.

Might be able to recognise your connectors form this site, then search the web for a source.
https://www.te.com/usa-en/plp/automo...als/Y30g2.html
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Re: Fuel pump inertia switch

Quote Originally Posted by Brgjohn View Post
That's a maybe, it would be good to hear from someone who has actually done it without compromising the canbus system
There would be no compromise.

Its an on / off switch. You'd simply be adding an additional one in line
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Re: Fuel pump inertia switch

Why not get a 2nd FIAT switch and loom section

So the Old reset button is disconnected and does nothing..

And the proper wired as it left the factory button is in a spot only you know
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Re: Fuel pump inertia switch

How do you turn it off? It usually requires a bump of some sort, such as hitting a wall! Not a good method of theft control every time you park.
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Re: Fuel pump inertia switch

Thanks guys, all I've read about canbus is that you cannot modify the wiring in length or with soldered joints. A bit more clarity would help.
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Re: Fuel pump inertia switch

Quote Originally Posted by Brgjohn View Post
Thanks guys, all I've read about canbus is that you cannot modify the wiring in length or with soldered joints. A bit more clarity would help.
Not sure what you've read and where you've seen that, but it all depends on the type of circuit. What you've mentioned should only be an issue if a voltage sensitive circuit, where different voltages and resistances will be meaning different messages are being portrayed.

For the circuit you're looking at it's a simple Yes/No / On/Off logic circuit.
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Re: Fuel pump inertia switch

Thanks for the reply.Just to confirm, I can cut into the inertia switch circuit without check engine warning light coming on or 'confusing' the canbus system
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Re: Fuel pump inertia switch

Quote Originally Posted by Brgjohn View Post
Thanks for the reply.Just to confirm, I can cut into the inertia switch circuit without check engine warning light coming on or 'confusing' the canbus system
Yes.

But. Don't 'cut' anything. Get a pair of correct connectors, and make up your won loom to your switch and back. Then nothing disturbed, and can be returned to standard easily.
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Re: Fuel pump inertia switch

Yes, thanks,that's a good idea, will do that. Just don't want to find out the hard way
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