430 Sparco/aftermarket seats

Good day gents. So I measured the resistance @ 1.49 ohms, and I purchased a resistor to match (1.5 Ohm 1/2 Watt Resistor). I'm going to attach it to the wire as you suggest.

There are 3 wires, do you, or others, know what wire it attaches to?

Thanks all!
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Contact Ian and see if he has the wiring info for this connector.

I am betting the brown is a ground and that the resistor should go across the yellow and the black.

don't take that for authority until you know for sure or you'll end up with a dash light on!

solder to wires before the plug so you leave plug alone for any future use

 

Thank you, the wires are actually red, black and yellow

 

I can't see the colors clearly in photo

thanks for that

all the more reason, however, to see if Ian has that diagram

 

Understood, that's why I called them out.

Very much appreciate all the support!

 

I am sure the yellow is one of them.

The big issue though is which of other two!

 

I was helping Lorenzo with this same issue just before the hurricane was coming.

So he did the green apple two-step out of the area

He's just getting back to normal now

 

Lol, just talked to him this morning

Yeah we're in the same boat 'cept my light's already been triggered.

Apparently I stupidly do stuff and then figure out what I have to fix, and Lorenzo wisely thinks things through before proceeding.

 

if it had flooded where he is he would have needed a boat!!!

 

you were very lucky.

hope we can now get the correct info on the seat plug wiring to finish the job.

 

Lol

 

I don't know if this Scud wiring diagram will help:

https://www.dropbox.com/t/etLRATPNjuAx38V0

The passenger presence sensor has 3 wires, but it doesn't appear to have a 3 pin plug. There are no internals shown for the sensor.

 

colorfull what did you measure to get the 1.5 Ohm resistance?

on Ian's diagram (and it is for the Scuderia and not the regular 430) connector R009 is for the passenger airbag.

it has blue and brown leads

that is the connector I would bypass for airbag removal

So I have to trace his diagram a bit more to determine exactly what the 3 prong connector is for

I am thinking that 3 prong connector colorful is showing maybe the wiring for the electric seat control and not the airbag!

Airbag systems almost always have blue and brown leads

There is no blue to that connector!

More research is needed

 

I think the resistance goes across the yellow and red lines since black is ground.

colorful which leads did you measure to get that resistance - yellow and red?

 

Assuming that plug is for the passenger weight sensor and assuming the sensor has some kind of potentiometer circuit ... like this...

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I would measure the resistance across each wire pair.

1) What is the resistance of red to black and does it not change with someone sitting in the seat?
2) is the red to black resistance roughly the same as the red to yellow resistance PLUS the yellow to black resistance?

Airbag wire harnesses usually have yellow sheaths as a warning, but perhaps the passenger weight sensor is not as critical as the airbag pyrotechnic circuits.

Are you sure the wire is red and not brown with a red stripe? Brown with a red stripe matches the wire colour in the wiring diagrams for the passenger weight sensor.

 

Ian

With black being ground that resistance with be w/o value

Plug Z071 - Passenger Presence Sensor - is the plug in your recent drawing

I am at this point zeroing in on the red/brown & yellow leads

If colorfull can confirm which leads he measure it may confirm my theory

 

The resistance measurement is being taken across the "red" and the black wires (across the seat sensor with the plug not connected). You would get the value across the entire length of potentiometer. If the sensor internals are as I've shown, this resistance should not vary with someone sitting in the seat. Once you've established the resistance across all wire pairs, it should be easy to figure out which wire pairs to put the dummy resistor across.

 

Apologies for picking up so late on this

I measured on the outer 2 wires (not black)

Tomorrow,

I will measure all pairs

I will see if I can experiment with having someone sit in the seat to see what happens

Stupid question, will it matter that the seat is out of the car? Ie, not connected, no power?

I dont think this smaller 3 pronged connector is for seat power, there is a much larger connector for that
Thank you both for all your help!

 

colorfull

measure w/o anyone in the seat

we need the full resistance measurement which may change with one in the seat

black is ground.

So measure across the brown/red and the black.

that should give you the approx 1.5 ohms you previously had measured

You can measure the yellow to black and then the brown/red to yellow just to get readings if any for comparison

 

Will do, thank you SO MUCH!

John

 

Omg, I'm such an idiot, I dug up the wrong photo. I am so sorry guys.

Scratch the blue connector I showed, that is on the CAR side

HERE is what is under the seat, and I measured the yellow and black wire to get the attached reading with no one in the seat.
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OK John

That makes things easier!

So there are two (2) plugs then?

I assume one for electric seat power and the other for the sensor.

I do not see a connector on Ian's drawing with just yellow & black wires unfortunately.

I would assume this small 2-wire connector is the one.

If you are measuring that resistance then a resistor across the leads should trick the system.

However you already have a light that has to be reset after you install the resistor to know if this is the correct wiring

John, is there a white trace on that black lead? Can't tell from photo.

 

Yes, a larger plug for the electronics and this smaller one, I presume airbag related

I looked on Ian's drawing and didn't see it either, perhaps the SCUD is different

There is no white trace, solid black

So when you say 'across the leads', on the car side, I would attach one end of the resistor to the brown/red wire and the other end of the resistor to the yellow wire?

I do realize I'm going to need someone to reset it when I'm ready

Can't thank you enough for your help

 

yes across those two wires before the plug so if needed in future you can remove the resistor and then plug it into the OEM seat

then have light reset and hopefully it should remain off

always happy to help when able

let us know what the result is

Lorenzo will need to do the same