The ECU is typically installed as part of the towbar wiring harness fitment:
Location:
Installation instructions commonly specify mounting the ECU within the tail light cavity, secured to the inner sheet metal, or on the chassis near the rear of the vehicle, often using double-sided tape.
Installation Method:
Installation involves tapping into the vehicle's existing control wires at the tail lights to obtain the necessary signals (stop, tail, reverse, etc.), and routing a separate fused power wire from the ECU directly to the vehicle's battery.
Availability:
While universal ECUs are available, vehicle-specific "plug-n-play" kits are often preferred for many Toyota models as they simplify the connection process.
