The instructions are confusing as f. Anyone know where this red wire go? Guessing the ground goes to the screw behind the woofer.



Red wire goes to?

Guessing the ground goes into this screw behind the rear woofer?

 

That sub-harness acts as a "bridge," or extension, between the 3rd brake light (parcel shelf) and the decklid harness.

Trace the harness back from the decklid rubber flex boot to the junction with the main harness (should be left/ front corner of (Coupe) trunk area). From there, you insert the red wire into the specified slot. There should already be a ground screw with which you would connect the ground wire. You disconnect the parcel shelf light and plug that connector into the other end of the sub-harness. If there is already a wire there, you might not need the sub-harness at all.

It is a very convoluted way to wire the decklid LED spoiler and the instructions are anything but clear on the matter. If you need any more clarity let me know...

 

Yeah, I'm still lost. I only see those white connectors on the right corner of the trunk cabin. There was a brown connector I disconnected to connect the sub-harness.

For under the trunk, there was an available connector.

 

Under the decklid there should be 3 connectors: Camera (4-pin), spoiler brake light (2-pin), and the lock release mechanism (3-pin (1-unused)). Trace that wiring harness FROM the decklid, THROUGH the rubber flex boot, to where it connects to the main harness via a large, white, 8-pin connector. This connector should be in the left corner of the parcel shelf. You will likely have to unwrap the tape/ insulation from the connection to get access.

The red and white wires from the sub-harness, where you plugged the brake light into, go to this 8-pin connector. The red goes to the empty slot shown in the diagram and the ground goes to the ground bolt.

Whoever designed/ engineered this screwball way to make this connection needs their neck wrung...

 

This?

The instructions says to pull the panels inside the trunk but you're saying its' the deck lid? I think imma just head to the dealership lol.

 

That's the connector.
Judging from that pic, and I admit the angle isn't that clear, it looks like you might not need to add the pin.

 

Thanks. Looks like its all filled. So I just can just disconnect the 3rd brake light and leave it unplugged?

 

Alright, just verified that led lights for the spoiler works. So I don't need it. Thanks man!

 

Then you're good to go!