209EUV wrote:
If you want the body mounted lights to be running/brake/turn you can splice in an oznium pwm dual intensity brake light driver on each side.

Pull the side panels of the trunk area, you'll see a connector with a green and black wire for the taillight. Green is the positive and black is negative.

I ran a wire from the blue wire on the pwm driver down and out of the vent under the hatch latch, over the metal bumper and connected it to the violet wire that goes to the bumper light.

There isn't much room to work where the bumper light connectors are. It's not necessary to remove the bumper, but it'll probably save you some grief.

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Where is connector X901 located? Behind the trim pieces in back on the left rear trunk area?
The connector is at the top of the hatch, there's pictures in the first post.

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video of end result:

https://www.youtube.com/watch?v=DmuQpQr4Gv4

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GB74 wrote:
ACDelcoTDS Rear Wiper Control Schematic for my 2023 Bolt EUV shows unswitched +12V fed by fuse F41UA, 20A for parking the rear wiper motor at female side of X901, the connector at top left of the liftgate.

I removed the top trim panel and measured +12V on the Gray/Violet (looks White/Violet tracer to me) with the Bolt EUV turned off.
[X901 body to liftgate photo]
[LIFTGATE top trim removed]
[Bolt EUV Rear Wiper Circuit-2.jpg]
[23_Bolt_EUV_Body_builder_SM]

Edit - Corrected a few typos in the drawing. 22 Awg from OEM splice to Tail Lights and X900, X901 pin #s.

Refs:
23_Bolt_EUV_Body_Builder_SM_en_US_2022AUG29.pdf
ACDelco TDS - www.acdelcotds.com

CHMSL to Rear Marker Lights IQ-275 with Left and Right wiring Installed on rear wall.
The wiring has room behind the plastic panels.

[Skene IQ-275]