Advice of fitting an Aftermarket Stereo to IS200 S Model
Advice of fitting an Aftermarket Stereo to IS200 S Model
You can easily connect up the relevant cable from the head unit to one of the bolts underneath the gear surround (which you'll need to remove). These bolts go straight into the chassis, so will be earthed. Connect the cable that they want you to connect to the handbrake to that, and you should be sorted.
Probably a bit late but there are a few 10mm bolts right behind the headunit, near the cross beam (big pipe behind dash) that i used and worked a treat for earthing out the brake wire?