The IC3645SH4D352Y2 is a 48‑volt, 350‑ampere motor controller used in golf cart and similar shunt‑motor applications. Common failure modes for this class include overheating of the IGBT or MOSFET array, failure of protection relays (over‑current/over‑temperature), and degradation of the power supply capacitors. Start by verifying that the 48 V input is within spec and that the output current limit is set correctly; then inspect the PCB for burnt components or cracked solder joints, especially around the high‑power IGBTs and gate drivers. Finally, check the status LEDs or diagnostic codes (if present) to confirm whether an over‑temperature or short‑circuit fault has been triggered.[oss-gpt-20b]