Pelvic splanchnic nerves carry:

postsynaptic parasympathetic fibers from spinal cord segments S2, S3 and S4 to their target organs.
presynaptic parasympathetic fibers from spinal cord segments S1-S5 to their target organs.
postsynaptic parasympathetic fibers from spinal cord segments S1-S5 to their target organs.
presynaptic parasympathetic fibers from spinal cord segments S2, S3 and S4 to their target organs.