The Ender 3 V3 SE and V3 KE utilize a compact toolhead PCB (printed circuit board) that consolidates wiring for the extruder, hotend, fans, and CR-Touch probe into a single connector interface to the mainboard. Understanding the pinout of this board is essential for troubleshooting, replacing damaged components, or performing upgrades like Klipper conversions. This guide provides detailed pin mapping for all connectors on the Ender 3 V3 SE/KE toolhead board, including the 26-pin main harness, hotend thermistor and heater, cooling fans, and CR-Touch probe connections.
Source: https://www.reddit.com/r/ender3/comments/17l8fhv/ender_3_v3_se_nozzle_v15_board_breakout_pinout/
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