There are two ways bluetooth car kits can be installed, one is the difficult way, the other is easier (however can still be fairly difficult dependant on vehicle). The problem is, Bluetooth kits are made with ISO connections as standard. ISO is an older industry standard which determins the locations of various wires (which perform different functions) For example, the front left and right speakers, back left and right, power, mute and ignition. If your vehicle is ISO, then the kits will install fairly easily.
The problem is, the ISO standard is now fairly old. More modern vehicles utilise systems such as CAN bus & fibre Optic MOST systems which do not use conventional wires. If this is the case you will either need to splice into the wires (where possible) or use a mute cable, ISO2CAR, Drive&Mute or Audio2Car. They all perform the same task, however each has a slightly different compatibility. For example Audio2Car work particularly well with amplified systems.
The only other difficult task when installing the bluetooth kit is to route the microphone into position. This routes from the back of the bluetooth unit. Usually installed behind the car stereo. From here its usually best to route the opposite direction from the driver. Remove the glovebox where ever possible (Different for each vehicle, but usually fairly pain free when the screws are found).
Remove the fascia from the A pillar in the vehicle, they usually un-clip, however sometimes they are screwed in, if so you should be able to pull out the airbag clip plate (a little plastic clip showing where the air bag is) a screw is usually found beneath this. There may be a couple more hidden screws to remove before the fascia can be removed. A little pull on the rear-view mirror fascia should allow you to install and route wire through the lining of the roof. (Dont pull too hard as you may pull the mirror off, and they can be a pain to reinstall) a metal coat hanger will do nicely when pushing it through. From here wire down the A pillar, avoid the air bags at all costs and do not tangle the wire around them. And route behind the glove box to the bluetooth unit.
After this do done double check you have the Power, Ground (when required) & Ignition wires are active. The Ignition is a must to check, the kits will not work with out it. In fact thid is the number one cause for people thinking they have a faulty unit. If your harness doesn't have an ignition (not all do) the best point is either the fusebox, or the Cigarette lighter wire. A simple way of testing is by turning the ignition on when the wires are connected. The unit should power up.
Assuming the kit is working tidy up behind the stereo and re connect the dashboard & fascias and position the microphone to exactly where you want it near the mirror (make sure is doesn't obstruct it). Pair your phone using the manufacturers instructions and you will have a fully working Bluetooth car kit at your disposal. (If you choose well, you'll wonder how you ever lived with out one).
All in all the job shouldn't take longer than an hour of your time, unless you have a particulatly difficult vehicle such as a BMW X5 (Due to the location of the unit) or most Porsche's (Because of the firewall).
Bluetooth Car Kits are known to improve driver safety when using the mobile phone, if you dont have one installed in your vehicle. Don't use your phone.
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