Car won’t start after changing series 1 radio to series 2 head unit

Has the new IQ been VIN matched to your vehicle?
The IQ incorporates the 'network router' for the CANBUS system.

 

Coding the unit will not change this, the canbus comms have been damaged or unplugged.

Pull out all iq connections, make sure looms haven't been crushed against the new cage.

 

Time to get second opinion

Google Ve Iq loom.

Leave all s1 wiring intact. It's plug and play.
Sounds like you might have jumped the gun.
The only wires to cut and join are the mic wires.

 

I did exactly that this year and as you thought it is totally possible and although it needs someone to make it pair with your actual cars vin ,i didnt have to cut any wires...i used a envious customs patch loom adapter which you have to use to make the job plug and play. Be aware although its not a big deal you cant turn the unit on without the key as in series one the vin info is not present without the key turned to accessories..also the surround around the gearstick is different series one to two

 

Here’s my Series 1 with a Series 2 head unit. Works quite well.
Have to have the donor headunit VIN matched.
There are quite a few offering this service.
You also require a patch harness. The Pinouts are different on the plugs.

 

Here’s mine but I went with the series 2 look ....round chrome vent surrounds and because the ssv has a lot of blackout trim ...kept that colour scheme .......camera was a challenge as I had to accurately drill 8 x 6mm holes and make a very large square hole for the actual factory camera but luckily I had a second chrome sacrificial boot trim that I could use as a template to drill/ file holes in the right place and it all fitted and worked....luckily when I bought the whole head unit in a sort of kit I got all the cabling / patch harness/ camera boot harness including the camera /DVD plug with tails that plugs into the head unit (they are Exy to buy separate and uncommon.)