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Control Interfaces - Overview

This section documents all control interfaces in the Jeep LJ build - the switches, controllers, and input devices that allow the driver to control various vehicle systems.

System Controllers

  • SwitchPros SP-1200 - Main lighting and accessory controller
  • 12-button control panel with Bluetooth app
  • 17 total outputs (12 main + 5 low-side drivers)
  • 150A total capacity on CONSTANT bus

  • Controls all auxiliary lighting and accessories

  • Command Touch CT4 - Steering column turn signal and headlight controller

  • 4 programmable outputs for turn signals and headlights
  • GPS module for intelligent turn signal auto-cancel
  • Replaces factory multifunction stalk
  • Controls turn signals, headlights, and high beams

Physical Switches

  • Dashboard Controls - Physical dash-mounted switches
  • Winch control switch

  • Other dash-mounted controls

  • Keyless Ignition - RFID + push-button start/stop replacing the factory keyswitch

  • Boomerang Bullet 230 RFID fob anti-theft
  • Single dash push-button (start/stop)
  • PMU24 runs the ignition state machine
  • Hidden hardwired bypass for emergencies

System Integration

All control interfaces integrate with the dual-battery electrical system:

  • SwitchPros SP-1200: Powered by CONSTANT bus (AUX battery)
  • Command Touch CT4: Powered by START battery CONSTANT, integrates with PMU
  • Dashboard switches: Various power sources depending on function
  • Vehicle Lighting - Complete vehicle lighting circuits controlled by these interfaces
  • Offroad Lighting - Auxiliary and offroad lighting controlled by SwitchPros
  • Engine Systems - PMU power distribution and engine bay subsystems
  • Horn - PIAA horn system (engine bay component)
  • Wipers - Ron Francis WS-51C wiper controller (engine bay component)