Toyota Yaris Amp Installation - Battery Issue

[speccyalex]

Hi guys, I'm relatively new to this forum so I'm still finding my feet!

I've installed an amplifier to my Toyota Yaris 2010 with the original HU (using a wiring kit). I installed the remote wire by splicing off the 12v ignition wire to the head unit and connected it to the amp remote section.

When I connect the fused power wire from the car battery (+) to the amplifier (B+), not only does the amp fail to turn on but the central locking via the remote fob stops working. If I remote the wire from the battery (+), the remote locking functions again.

Any ideas why this could be happening?

Thanks in advance!