Fuel pump inertia switch

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Fuel pump inertia switch

Brgjohn

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2019 Ducato, can I cut into the wiring on this switch to add a hidden remote sucurity switch ? Concerned about Canbus
 
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
 
That's a maybe, it would be good to hear from someone who has actually done it without compromising the canbus system
 
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/automotive-terminals/Y30g2.html
 
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.
 
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.
 
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
 
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.
 
Yes, thanks,that's a good idea, will do that. Just don't want to find out the hard way
 
Gets more complicated, had a look today. It's not just a switch, it's got 3 wires connecting to it! Which is in? Which is out and what's the other one doing
 
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