Auto-dimming IRVM was a feature that I sorely missed in my Creta SX Plus automatic. I did a little research and found an easy way to solve the problem.
Before I start, I should apologise for my mediocre writing skills. Being a doctor with zero knowledge about electricals or electronics, I felt quite ill-equipped writing this. But, I thought I'd give it a go purely due to the excitement of being able to complete this modification without any help.
Let's start.
1) Ordering the right part
You don't want to dismantle too many things or crack your windshield pulling out the IRVM. So I ordered this kit from aliexpress. Choose option no.1 for the type of bracket. This costed around Rs. 6,000 (with express shipping and customs duty included). It will probably cost you Rs. 5,000 if you choose slower shipping methods. This is where your expense ends.
http://www.aliexpress.com/item/2015-...307532815.html 2) Removing the existing IRVM
First, remove the screw at the bottom (near the junction where the IRVM meets the windshield). Then, just pull the base of the IRVM upwards and that's it. You've completely removed the IRVM now. What's left is the silver metal piece where the new IRVM is going to slot in.
3) Remove the the interior cabin light and the sunglass holder. Once you open the sunglass holder, two screws will be visible. Unscrew them and you can easily remove the whole part. Two connections have to be unplugged here - 1) interior light wiring harness and 2) Bluetooth microphone harness. Once these two connections are unplugged, the cabin lights + sunglass holder trim can be removed.
4) Making the wiring connection
There are four wires in the wiring harness that connects to the cabin lights. The last two wires on the right side are orange and black in colour. Black is the ground wire and orange is the active power supply. To check if it works, connect the bare end of the red wire (from the new auto-dimming IRVM) to the other end of the harness, where the orange wire terminates. Similarly, do the same with the black wire from the new auto-dimming IRVM (connect it to the to the other end of the harness, where the black wire terminates). When I say connect, I mean just insert it into the other end of the harness, so that the wires touch the other end. This will make the connection active and the green light from the auto-dimming IRVM will light up. Now you know it works! You also need to ensure the power supply gets cut off when you leave the car. So ask someone to hold the wires in place, switch the engine off and lock the car. Within 5 seconds the green light from auto-dimming IRVM will go off. Unlock the car and the light comes back on. Done! Confirmed! Now you know the power supply gets cut off when you leave the car and lock the door.
5) Securing the connection
Once you know the connection is right and everything works, you need to fix and secure it. There are many ways of doing this. You could use a wire tap connector and tap the orange and black wire from the existing wiring to make the connection. See the picture:
I didn't want to meddle with the original wires. So, as you saw in the picture where I tested the connection, I left the two wires from the auto-dimming IRVM on the other end of the harness. I bent the bare wires so that the wires don't cause any obstruction when I attempt to plug it back in directly into the cabin light port. Then, slowly plug it back into cabin light port. You can ask someone to hold the wires in place while you push the harness back into the plug. Throughout this process, ensure that the green light from the IRVM remains on, so that you know the connection is still active. I tried to pull the wires to check if it was a tight fit and it was. The red and black wires sent with the IRVM are quite long, so the extra wires were tucked into the sides. There's plenty of room there.
6) Closing up
Now that the main connection is done, plug the Bluetooth mic harness back in. Put the cabin light trim back in position and screw it in. An extra cover is provided that slots in easily and covers the wire that goes from the IRVM to the roof lining.
That's it! You're done! You've got an auto-dimming IRVM for around Rs. 6,000 rupees (or 5,000 if you don't choose express shipping) without cutting any wires!
I forgot to take pictures of a few steps, So, I've tried to describe whatever I did to the best of my abilities. It would have been much easier if I had taken more pictures though. But, this is honestly an easy mod and you shouldn't have any problems.
Cheers!