The weather wasn't so good later in the afternoon today, and also it gets dark fairly early.
To remove the stock radio you need to dismantle the centre section, however I don't think this is required once the radio has been changed. This is because the stock unit is bolted in from the bottom, whereas any replacement is not.
Start by removing the section with the armrest, there are four screws you need to undo. The rear lifts up easily once these are undone, then you can lift the front and disconnect the cigarette power lead, after that you can pull the rear up a fair amount before you need to remove the USB and AUX connectors, there should be no issue accessing these. The whole section can now be removed.
Screws to remove
Section lifted up, and cigarette power cable
USB and AUX cables
Now remove the gearstick surround.
To remove the front section, you need to remove two split pins (not sure of the real name) from the passengers side, and one from the drivers side. There is also a standard push pin right at the back of the trim, next to the footrest.
You will also need to remove the panel under the steering wheel, this is done by first removing the panel on the far right, then remove the single screw, after that the panel below the steering wheel can be pulled off. I found it is easiest to start from the bottom and pull towards the seat.
Once these have been removed (a panel remover tool really helps), you can just pull the section towards you and out, there are no wires connected to it.
Front section removed
Remove the two bolts below the radio, and the three on top under the panel. Under this panel is where I chose to put my GPS receiver, I have yet to test how well it works, but sat in the drive it seemed to get a strong signal.
Screws under top panel
You can now pull the radio out, it will seem fairly fixed, but once all of the clips are out it will come out easily. The hazzard switch cable seems to be quite short, so this will need to be removed once the radio is slightly out. The other cables have a reasonable length to them, so you can remove them easier.
It has been mentioned in other threads that a small corner section needs to be removed for the unit to fit, and this is correct, however I also had to remove some more of the plastic.
Bottom left corner of plastic removed
I found that the fascia did not sit flush on the left hand side, removing the headunit and looking in showed that the screws were catching. I simply cut this plastic away, and now the fascia fits perfectly, without any heavy-handed antics. It may also be possible to trim the legs where the screws go into the fascia, but I did not try this.
Screws hitting internal plastic
Fascia fitting flush with other panels
You will now need to connect up all of the wires for your headunit.
There is a small space at the back, almost like a shelf, where most of the wires will sit. It will take a bit of rearranging wires from underneath, but the headunit and fascia should go on without too much hassle.
Then replacing the panels is just the reverse of removing them.
Below are a few pictures of the headunit fully installed, and the place where my GPS receiver is mounted.
I've made sure to include a picture of the original screen, showing that it is working fully once the unit has been installed. Time is adjusted by holding down the "Mode" button, and then using the "CH" and "VOL" keys to alter the time and date values.
I don't know whether this is just with my headunit, or all headunits, but I was not able to assign a long-press of the steering wheel button to a function, as soon as the button was pressed, it set the function on the headunit. An example of a long-press functionality on the standard radio was to hold "CH" to change folders when using the USB input, but just a press would change track.
GPS receiver under top panel, and completed installation
Fully-functioning original screen, and headunit working