Can you please post pictures of the wiper blades you got?
Have you checked the main bulb for the speedometer? It might be fused.
Not worth experimenting on, it'll still ruin your entire gearbox.
It's not worth it at all, the new one costs 15,000rs. It is built-in but it has horrible built/sound quality. The software is just like the homescreen of a Chinese cell phone. I would suggest you get yourself a OEM Toyota headunit. I have the ND3T-W55 headunit in my Belta, it supports DVD, CD, MP3, FM/AM, MD, TV, back-up camera, CD/DVD changer and what not. You can get a decent one for about 20,000rs
An OEM Toyota Tv/Navigation and DVD player would be a million times better than that Chinese built-in one.
I wouldn't suggest to anyone, honestly.
A brand new unit costs 15,000rs.
Good luck with the sale, reasonable asking price considering it has a 4.5 grade auction sheet.