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Hayman Reese SmartClick waterproof ECU 10 is an electronic control module for compatible vehicle-to-trailer lighting installations. Select it by the vehicle and fitted loom's ECU specification, not waterproof construction or connector appearance alone.
For Holden Colorado applications listed under Hayman Reese 03231RW, ECU 10 is normally specified for LTZ and Z71. Some vehicles vary: a three-wire tail/brake light requires ECU 10, while a two-wire tail/brake light requires ECU 12. Check the actual light wiring rather than relying solely on the vehicle badge.