The only viable option and the most popular online is to take the remote-signal from the 12v adapter / cigar-lighter in the dash, which shuts down straight away. It's a fiddly setup with a spring, so to avoid wrecking the sliding ash-tray mechanism it's best to remove the whole centre-console as one piece and quite a bit of dash and trim has to be removed to do this. With the battery and audio-feed already in the boot, this is the longest and most involved part of the whole job, but a lot less difficult than I imagined.
You will need a good length of wire to reach from the cigar-lighter, over the dash, under the sills and into the boot. The blue remote-wire that comes with
1. Removing the Trim to get to the Cigar-lighter wires:
1.1 Pull forward the trim-strip that holds the passenger and centre air-vents on the dash, starting at the passenger side edge [door-open], working it gently up with a flat screwdriver and moving along to the centre.
1.2 From behind the trim-strip, press out the hazard-light and lock switch-panel out of the trim-strip and unplug the wiring-connector. The trim-strip can now be removed.
1.3 Remove the 2 crosshead screws from the top corners of the radio/climate-control fascia and pull that forward top first.
1.4 Unplug the 2 wiring-connectors from the climate-control fascia and pull it further forward.
1.5 Unplug the 3 or 4 wiring-connectors from the bottom of the fascia [ASC/PDC/heated-seats etc.] and completely remove it.
1.6 Gently prise up the gear-stick gaiter and lift it up out of the way.
1.7 Remove the iDrive knob by pulling it vertically upwards.
1.8 Remove the 2 screws under the gearstick-gaiter holding the centre-console trim panel using a T20 Torx-head driver.
1.9 Use a flat-screwdriver to gently prise up the centre-console trim panel, being careful of the 2 push-studs at the rear, unplug the 'Menu' button wiring-connector and remove the panel.
1.10 Remove the 4 screws holding the ash-tray using a T20 Torx-head driver and lift the ash-try out. It is not necessary to unplug the wiring-connector as it should reach out enough to splice the wire.
2. Splicing / Running the Remote Wire:
2.1 Pull down the plastic trim-panel directly under the steering-column. It has a push clip at either side.
2.2 Run the remote-wire in through the open trim-panel and round to the bottom of the dashboard and under the ash-tray surround so it comes out with the cigar-lighter wiring.
2.3 Splice the remote-wire into the Red live-wire for the cigar-lighter. Solder/heat-shrink is best, but I went with the quick and easy Scotch-lock method.
2.3 Re-fit the centre-console and dash/fascia trim, or if you wish to add a switch so the subs/amp can also be turned off manually then follow THIS POST first.
2.4 Remove the coin-tray from under the steering-column by undoing the 2 crosshead-screws.
2.5 Pull back the door-seal from the lower front-corner of the driver's door.
2.6 Run the other end of the remote-wire through the opposite side of the open trim-panel under the steering-column [towards the driver's door] to where it can be reached from the coin-tray aperture.
2.7 Reach into the coin-tray aperture with the end of the remote-wire and feed it through the edge of the dashboard until it can be seen in the gap behind the door-seal.
2.8 Pull the rest of the remote-wire out of the door-seal and re-fit the trim-panel / coin-tray.
2.9 Feed the remote-wire down behind the trim-panel at the low front corner of the driver's door and lift up the door-sill trim until the wire can be reached and pulled through from below into the footwell.
2.10 Re-fit the door-seal.
2.11 Remove the rear seat-squab by pulling it up sharply at the either side.
2.12 Run the remote-wire through into the rear footwell and up the side of the rear seat, tucking it under the door-sill and B-pillar trim as you do so.
2.13 Locate a gap along the top of the seat-back / parcel-shelf for the remote-wire to run through into the boot, the easiest place is the driver's side about halfway to the centre, and feed the wire down about 6 inches. From side the boot the wire should be coming through at the far edge of the parcel-shelf, so pull a good length through to avoid it getting yanked back up.
2.14 Run the remote-wire under the trim at the side of the seat-squab, tuck it up behind the side of the seat-back and along the parcel-shelf, then pull the remaining wire through into the boot.
2.15 Re-fit the rear seat-squab.
1. Removing the Trim to get to the Cigar-lighter wires:
1.1 Pull forward the trim-strip that holds the passenger and centre air-vents on the dash, starting at the passenger side edge [door-open], working it gently up with a flat screwdriver and moving along to the centre.
1.2 From behind the trim-strip, press out the hazard-light and lock switch-panel out of the trim-strip and unplug the wiring-connector. The trim-strip can now be removed.
1.3 Remove the 2 crosshead screws from the top corners of the radio/climate-control fascia and pull that forward top first.
1.4 Unplug the 2 wiring-connectors from the climate-control fascia and pull it further forward.
1.5 Unplug the 3 or 4 wiring-connectors from the bottom of the fascia [ASC/PDC/heated-seats etc.] and completely remove it.
1.6 Gently prise up the gear-stick gaiter and lift it up out of the way.
1.7 Remove the iDrive knob by pulling it vertically upwards.
1.8 Remove the 2 screws under the gearstick-gaiter holding the centre-console trim panel using a T20 Torx-head driver.
1.9 Use a flat-screwdriver to gently prise up the centre-console trim panel, being careful of the 2 push-studs at the rear, unplug the 'Menu' button wiring-connector and remove the panel.
1.10 Remove the 4 screws holding the ash-tray using a T20 Torx-head driver and lift the ash-try out. It is not necessary to unplug the wiring-connector as it should reach out enough to splice the wire.
2. Splicing / Running the Remote Wire:
2.1 Pull down the plastic trim-panel directly under the steering-column. It has a push clip at either side.
2.2 Run the remote-wire in through the open trim-panel and round to the bottom of the dashboard and under the ash-tray surround so it comes out with the cigar-lighter wiring.
2.3 Splice the remote-wire into the Red live-wire for the cigar-lighter. Solder/heat-shrink is best, but I went with the quick and easy Scotch-lock method.
2.3 Re-fit the centre-console and dash/fascia trim, or if you wish to add a switch so the subs/amp can also be turned off manually then follow THIS POST first.
2.4 Remove the coin-tray from under the steering-column by undoing the 2 crosshead-screws.
2.5 Pull back the door-seal from the lower front-corner of the driver's door.
2.6 Run the other end of the remote-wire through the opposite side of the open trim-panel under the steering-column [towards the driver's door] to where it can be reached from the coin-tray aperture.
2.7 Reach into the coin-tray aperture with the end of the remote-wire and feed it through the edge of the dashboard until it can be seen in the gap behind the door-seal.
2.8 Pull the rest of the remote-wire out of the door-seal and re-fit the trim-panel / coin-tray.
2.9 Feed the remote-wire down behind the trim-panel at the low front corner of the driver's door and lift up the door-sill trim until the wire can be reached and pulled through from below into the footwell.
2.10 Re-fit the door-seal.
2.11 Remove the rear seat-squab by pulling it up sharply at the either side.
2.12 Run the remote-wire through into the rear footwell and up the side of the rear seat, tucking it under the door-sill and B-pillar trim as you do so.
2.13 Locate a gap along the top of the seat-back / parcel-shelf for the remote-wire to run through into the boot, the easiest place is the driver's side about halfway to the centre, and feed the wire down about 6 inches. From side the boot the wire should be coming through at the far edge of the parcel-shelf, so pull a good length through to avoid it getting yanked back up.
2.14 Run the remote-wire under the trim at the side of the seat-squab, tuck it up behind the side of the seat-back and along the parcel-shelf, then pull the remaining wire through into the boot.
2.15 Re-fit the rear seat-squab.
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