What's this connector? & speed sensor question

Technical Area Electrics & ICE
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  1. My model of MX-5 is: NC2 3.5 PRHT
  2. I’m based near: Manchester
  3. I’m looking for technical help or recommendations on: Double Din install to replace Bose head unit.

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Couple of questions please. I’m considering installing a double din wireless carplay unit (Kenwood DMX8019DABS) into my recently acquired NC2 to replace the Bose head unit. The Kenwood unit has a vehicle speed sensor connection for the GPS and I wondered if this was catered for in the various wiring harnesses that I will need to get or will it need to be dealt with separately?

Also, whilst looking behind the glovebox earlier, I noticed a white block connector (circled in the pic), any idea what it’s for?

Thanks,
Sean

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Can’t answer the questions about the Kenwood but I think that connector maybe for the factory Bluetooth module. Has your car not got Bluetooth?

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Thanks for the prompt reply, yes it has bluetooth.

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Ah, not that then…

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Could that be a spare connection to do with the cooling/Aircon system?

Whilst looking at the pic, have you had or got leaky grommets of the scuttle variety, bit of rust in there?

1 Like
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I wonder if it’s for the advanced keyless entry module, a system not fitted to UK cars.

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Yes, I could not help seeing the rust streaks - classic on the NC. The accursed rotting Scuttle Grommets!

Sorry I don’t know about the plug, I’d be interested too.

My 2008 NC1 also has the same one unused and I could not find out for sure what it was for when I first noticed it a few years ago. I speculated it was perhaps the control module to do with the Advanced Keyless locking, and am so glad I only have the usual push button remote central locking.

Ah Robbie beat me to it!

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Thanks for the replies, general consensus then is keyless entry. I’ve had the car since December but seems OK with regards to any water ingress - previously had a 2006 NC so somewhat aware of that issue.

Regarding the speed sensor connection, seems to be similarities to finding Lord Lucan - there doesn’t seem to be a definitive answer anywhere that I can find!

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VSS wire is a blue and white at the white radio loom connector according to this post on miata.net
[NC] VSS wire in the cabin? Yes or no? - MX-5 Miata Forum

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Thanks for that, although it casts doubt on whether vehicles fitted with Bose actually have VSS? The plot thickens.

I’ve been looking at software updates on the Kenwood website and a YouTube video, albeit American, seems to suggest that updating the software by USB now eliminates the need to connect the VSS wire.

I suppose the only way to find out is to install the unit and try it.

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There are also several references around that it’s required for the speed dependent volume control, cruise, speedo etc so you should have it.
It comes either from the abs controller or a gearbox unit on non abs cars.
You should be able to read vehicle speed thru obd2 port with appropriate dongle and torque app. That would prove it exists.