The order along the motherboard’s left edge from the top down is:

A small yellow and black circuit plug.

The main brush motor's circuit plug which has two pairs of twisted wires, one red and white, the other pink and black.

A wider, multicoloured circuit plug which is attached to bObsweep’s left wheel.

Finally, a small circuit plug with black and blue twisted wires.

When all have been connected to bObsweep, begin putting the cover back together before vacuuming again.