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Wheelchair Lift Safety Interlock

InPower’s Models ITM129 ITM129ADL-T20 interlock systems provide the required FMVSS 403/404 interlock functions for public-use platform lifts installed in Ford Transit chassis. The system consists of a combined driver’s display and control module as well as an easy-to-install plug-and-play chassis wiring harness.

Wheel Chair Lift Safety Interlocks ( ITM129-T20, ITM129-T20-ADL, ITM129-ADL )

Ford Interlock System For Monitoring Platform Lift Door And Up To Four Auxiliary Doors

Key Features:

  • Diagnostic dash display
  • Monitors up to four-door switches
  • Plug-and-Play wiring harness
  • Models available for lift door only, or all doors locking shifter
  • Door ajar indicator
  • Works with side and rear door lift installations
  • Compatible with all current production platform lifts for Braun, Ricon or Maxon


  • Power Input: Power and ground are obtained from shifter T-harness
  • Rear Lift Door* In: From lift door closed switch. Ground when door is closed (violet)
  • Monitors up to three additional doors for door ajar flashing indicator, no shift lock (blue)
  • Lift Enable: +12 volts @ 1.8 amps to allow platform switch operation (yellow)
  • Size: 3.5″” W X 1.5″” H X .56″” D
  • Operational Temperature: -40C to +85C
  • Please see owner’s manual OM-190 for the ITM129 and ITM129ADL for detailed cable information

System Diagram:

Mechanical Drawing:

Product Literature and Resources:

ITM 129 Data Sheet

ITM 129 Owners Manual

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