HRW Relay? (TR7 Heated Rear Window)

[supercass]

Is the power to the heated rear window operated by a relay or does it pass through the switch?
supercass

[busheytrader]

I didn't think there was a relay fitted to the HRW part of the loom when I fitted an accessory to it on my DHC years ago. (The DHC doesn't have a HRW but is wired for it, just fit the dashboard switch)

The 1980 Euro wiring diagram I have backs this up. If you want to PM me with your email address I can send this across.