Blue wires with caps on

Two blue wires with caps on. One labelled ‘Wi-Fi Antenna’ and the other labelled ‘Bluetooth Antenna’. What to do with them and how to connect them?

Wiring your android headunit to your vehicle is usually straight forward but you can come across some anomalies that are confusing. The instructions are not clear and the labels on the cables don’t answer any questions, but just raise more questions.

Why are there caps?

Should the caps on the ends of the bluetooth and wifi cables be removed? They just pull off, and if you do remove the cap, what do you connect it to?

The caps on the cables are to insulate the ends of the wires and should not be removed. The wire end on the wire needs to be insulated from any GND – ground, like the vehicle metalwork.

How to connect the bluetooth and wifi wires?

There is no need to connect these wire to anything. The caps stay on the ends of the cable and they are just left to hang free behind the android headunit. That’s it, not cutting, no joining. Just a free cable. Unlike all the other cables from your android headunit that have an connection to be made, these two capped off cables don’t connect to anything at the capped end.

Why does bluetooth and wifi need a cable anyway?

Good question. You don’t have a cable for bluetooth hanging from a phone, came for wifi. Laptops don’t have an aerial connected to the wifi or bluetooth? But they do, you just can’t see them. The aerials for bluetooth and wifi are hidden inside the plastic and glass of phones and laptops.

Metal Body

The body of an android headunit is almost completely made of metal. This metal cage around the internal electronic components is designed to keep the electronic interference inside the android headunit. Having the electronic interference escape could, in an unknown and thoroughly untested way affect the vehicle electronics. Anything from an annoyance to a serious safety fault. The metal body of the android head unit keeps the car electronics separated from the vehicle electronics.

But this will also keep the internal wifi and internal bluetooth signals safe inside the headunit and this is not useful for the data from wifi or bluetooth. So the solution is to run a cable, one each for bluetooth and wi-fi, outside of the protective metal cage.

Extending the BT and Wi-Fi cables

A longer cable isn’t going to give you a better signal. The wires are cut to the right length in the factory and a plastic cap is applied to one end. The cap insulates and indicates that the wire is not to be connected to anything. Don’t expect any improvement in the poor wifi or poor bluetooth by extending the wires. You may be better off just repositioning the wifi and bluetooth cables, separate them form each other and from other cables in the vehicle wiring.

Android guy who loves his android head units as much as he loves his cherry pie.

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