In the plug that you have chopped off is the voltage regulation circuitry needed to convert the 12V to 5V, if you connect a TomTom dirrectly to +12V it will emit rather costly smoke so DON'T DO THIS
You need to purchase another ciggy lighter socket and wire that to the cars 12V electrical supply, insert the TomTom charger lead to this and bind with tape to secure the unit and stop it falling out, route the cable through the back of the dash and you will have a neat installation, I did something rather similar over the last weekend with some of my kit, perhaps this might help as a guide:
I decided I had seen enough of all those cables strewn about the car and decided to tidy it all up - Far from a small task due to the amount of wiring from the new stereo that seems to have apeared since the first post:
Having removed the central air vent from the car I set to with a Dremel to cut a small access hole for the cables that were going to the 940, in this case the power lead, audio line out and the RDS-TMC round style plug
The three cables are easily fed through the newly made hole, any V70 owners should note the area I cut through is doubled skinned so you need to make two cuts and if you remove the Climatic Control Panel do not disconnect it or the car will throw an airbag fault.
Feeding the cables through the airvent was good fun, in the end I took the vent to bits and put the cables through where I needed them before reassembling the vent afterwards, fiddly but not impossible, the trick is to only put the power cable through one opening and the othe other two cables through an adjacent vent hole. Doing this lets the airvent still operate correctly and spreads the cables ready to connect to the 940 mount.
As I had most of the dash trim out of the car for access and I hate wires in the car I decided to sort out the iPhone cables at the same time, the power connector for the iPhone is easily removed from the Brodit holder by releasing the two screws on the rear of the phone holder, this makes it much easier to push the cable with connector through any available gaps in the trim.
Push the connector back in to position within the Brodit mount then resecure using the closure plate and two screws.
Resecure the Brodit Active holder to the swivel coupling by tightening the center screw, only finger tight is needed though, any more than this will snap the plastic on one part of the ball joint.
I pulled out the stereo to gain access to certain connections, firstly the RDS-TMC receiver needed connecting to the car aerial cable via a splitter cable I made a while ago (detailed in
This Thread).
I was also fitting a three way 12V outlet socket to power the TomTom charger and iPhone power addaptor, the feeded wires to this were simply tagged to the stereo ignition switched power wires using Scotch locks.
At this point its worth checking the power is working correctly so I switched it all on and got indications of charge for both the 940 and the iPhone so it was time to start tidying up.
Before burying all of this I taped up the power addaptors so they couldn't migrate out of the sockets due to vibration and/ or thermal creep - easy to do just bind them together with PVC tape.
The power addaptor was then secured to the underside of the glovebox support bracket with more tape, it looks a little unsightly but once the cars back together non of this will be seen. The orange boxes are part of the iO-Play device I added to the car for decent Handsfree support, this is detailed in
This Thread, the boxes get hidden when the trim is replaced.
I added a new cable to the stereo during this install which adds iPOD support to the stereo, whilst I probably don't need this (yet) it saves taking the whole lot out again to add a simple cable, this is nothing to do with the TomTom but adds iPOD input to the stereo and offers full control of a device plugged in to it. I decided against using this with the iPhone as I have a Bluetooth module for that which negates the need for cables.
All cabled up and working - Oh look no wires and remember this includes an RDS-TMC receiver, much neater even though it did take a few hours.
With the 940 off its bracket all that is left is a simple shoe that is pre-wired and ready to go once the device is dropped in to position.
The iPhone holder also attracts less attention as there are no tell tale wires going to it strewn all over the car.
Next job is to vac out the inside of the car, bits of black plastic dust have got all over from the cutting job, but overall I am happy with the installation and the flexibility I get from the kit - Mike
