Command Touch CT4¶

Overview¶

The Command Touch CT4 is a steering column-mounted controller that replaces the factory multifunction stalk. It provides complete turn signal and headlight control for the Jeep LJ build.

Specifications:

• Total Capacity: 10A per switch output (~9A max actual load)
• Four Outputs:
• SW1 (UP): Right Turn Signal (configured in turn signal mode)
• SW2 (DOWN): Left Turn Signal (configured in turn signal mode)
• SW3 (PULL): Headlights (low beam, latching on/off)
• SW4 (PUSH): High Beams (momentary or toggle)
• Built-in Hazard Switch: Flashes all outputs in sync when pressed
• Built-in Audio Module: Audible sound when turn signal is active
• Lane Change Feature: Lever press <0.5 sec flashes turn signal 3 times

Turn Signal and Lighting System Integration¶

The CT4 provides complete turn signal and headlight control:

Turn Signals¶

• Front Turn Signals: Amber LED turn signal lights (dedicated turn signal only)
• Wired to CT4 SW1 (right) and SW2 (left) outputs
• Wire gauge: 14 AWG from CT4 to junction, 16 AWG to each light

• Note: These are dedicated turn signals, not dual-function with parking lights

• Rear Turn Signals: Maxbilt Trail Tail lights (integrated brake/turn/marker/reverse)

• Brake/Turn wire (Yellow): Combined brake and turn signal function
• Wired to CT4 SW1 (right) and SW2 (left) outputs (parallel with front signals)
• Wire gauge: 14 AWG from CT4 to rear junction
• Note: Yellow wire handles both brake and turn signal (combined function)

Headlight Control¶

• Headlights (SW3 - PULL): Baja Designs LP6 headlights (low beam)
• Pull lever → Activates headlights (low beam)
• Power: PMU Out 13 (CONSTANT) → CT4 internal switching → SW3 output
• CT4 SW3 output → LP6 Pin 1 (low beam, both lights in parallel)
• CT4 handles switching internally (10A output capacity, 3.6A actual load)
• Disabled when ignition off (via ignition signal from ignition switch RUN)
• Latching on/off control (pull once to turn on, pull again to turn off)
• Wire gauge: 14 AWG from CT4 SW3 output to LP6 headlights

• When active: Also triggers DRL cutoff relay to disable DRL circuit (SW3 output tapped to relay coil)

• High Beams (SW4 - PUSH): Switches to high beams

• Push lever (while headlights on) → Activates high beams
• Power: PMU Out 13 (CONSTANT) → CT4 internal switching → SW4 output
• CT4 SW4 output → LP6 Pin 4 (high beam, both lights in parallel)
• CT4 handles switching internally (10A output capacity, 5.6A actual load)
• Disabled when ignition off (via ignition signal from ignition switch RUN)
• CT4 provides mutual exclusivity (high beam disables low beam automatically)
• Momentary or latching toggle (programmable)
• Wire gauge: 14 AWG from CT4 SW4 output to LP6 headlights

DRL/Parking Lights¶

Automatic ignition-controlled circuit that powers:

• License plate lights
• LP6 Headlight DRL function (Pin 3) - via cutoff relay
• Front 2" LED side markers (parking function)
• Maxbilt tail light RED wire (marker/parking function)

Power Source: PMU Out 9 (8A capacity, SWITCHED)

DRL Auto-Off: PMU programming logic disables when CT4 SW3 activates (headlights on = DRL off)

Wire gauge: 14 AWG from PMU to junction, 16 AWG to each light

See PMU DRL Auto-Off Logic section below for complete wiring.

Wiring Pinout¶

12-pin Connector on CT4:

Programming Configuration¶

The CT4 is highly programmable. Recommended configuration for this build:

1. Turn Signal Mode: GPS turn signal mode (automatic cancellation based on speed and steering angle)
2. SW1 (UP) = Right Turn
3. SW2 (DOWN) = Left Turn

4. GPS module monitors vehicle speed and steering to detect turn completion

5. Ignition Control: Ignition-aware mode

6. SW1/SW2 (turn signals/hazards) work anytime, even when ignition is off (critical for safety)
7. SW3/SW4 (headlights) disabled when ignition off (via ignition signal from ignition switch RUN)

8. Prevents battery drain from headlights left on

9. ON-OFF/Momentary:

10. SW1/SW2: ON-OFF (latching turn signals with GPS auto-cancel)
11. SW3 (Headlights): ON-OFF latching (pull to turn on/off)

12. SW4 (High Beams): Momentary or ON-OFF (choose preferred behavior)

13. Low Voltage Disconnect: Enabled for all switches (protects battery from over-discharge)

14. Flash/Strobe: Disabled (turn signals use built-in flash pattern)

15. Switch Memory: Disabled (turn signals don't remember state after ignition cycle)

GPS Module Configuration¶

The CT4 includes a GPS module that enables intelligent automatic turn signal cancellation:

• GPS Auto-Cancel: Monitors vehicle speed and steering angle to detect when a turn is complete
• Manual Override: Can still manually cancel by moving lever to center or opposite direction
• Lane Change Mode: Quick press (<0.5 sec) still flashes 3 times, then auto-cancels
• Mounting: GPS antenna must have clear view of sky (mount on dash or near windshield)
• Calibration: May require initial calibration drive for optimal performance

PMU DRL Auto-Off Logic¶

Purpose: Automatically turns off DRL when headlights are activated via CT4 SW3

Implementation: PMU programming logic (no external relay needed)

PMU Configuration:

PMU Input 7 (In 7): CT4 SW3 headlight status signal (tapped from low beam circuit)
PMU Input 6 (In 6): Ignition RUN signal
PMU Output 9 (Out 9): DRL/Parking lights circuit

Programming Logic:
IF (In6_IgnitionRUN == ON) AND (In7_CT4_Headlights == OFF)
  THEN Out9_DRL = ON
ELSE
  Out9_DRL = OFF
END

How It Works:

1. Ignition ON, Headlights OFF (CT4 SW3 off):
2. PMU In 6 = ON (ignition RUN)
3. PMU In 7 = OFF (CT4 SW3 not active)
4. PMU Out 9 = ON

5. All DRL/parking lights illuminated

6. Ignition ON, Headlights ON (CT4 SW3 on):

7. PMU In 6 = ON (ignition RUN)
8. PMU In 7 = ON (CT4 SW3 active)
9. PMU Out 9 = OFF

10. Headlights (low or high beam) active instead

11. Ignition OFF:

12. PMU In 6 = OFF
13. PMU Out 9 = OFF (regardless of headlight status)
14. All DRL/parking lights off

Installation Notes:

• Tap CT4 SW3 output (low beam circuit) to PMU In 7 for headlight status monitoring
• Use 14 AWG wire from PMU Out 9 to DRL junction
• PMU Out 9 distributes to:
• LP6 Pin 3 (DRL) - both lights
• License plate lights
• Front LED side markers
• Maxbilt tail RED wire (marker/parking)
• Total DRL circuit load: ~8A (4 circuits: license plate, LP6 DRL, front markers, rear markers)
• PMU Out 9 capacity: 15A (sufficient for 8A load)

Advantages over relay:

• No external relay hardware required
• PMU monitors current draw and provides diagnostics
• Programmable delays and soft-start capabilities
• Can log DRL activation events
• Integrated overcurrent protection

Installation Checklist¶

Power & Ground¶

• Route PMU Out 13 wire to steering column location (CT4 12V supply)
• Connect CT4 ground to chassis ground or firewall ground stud
• Verify ground connection is clean metal-to-metal contact

Ignition Signal¶

• Connect CT4 ignition signal to ignition switch RUN output (Y-split shared with PMU In 6, SwitchPros)
• Route ignition signal wire from ignition switch to steering column (18 AWG)
• Verify SW3/SW4 (headlights) are disabled when ignition is off
• Verify SW1/SW2 (turn signals/hazards) work with ignition off (safety feature)

Turn Signal Wiring¶

• Route CT4 SW1 (right turn) wire from steering column to:
• Front right 2" LED side marker
• Rear right Maxbilt tail light (YELLOW wire - brake/turn)
• Route CT4 SW2 (left turn) wire from steering column to:
• Front left 2" LED side marker
• Rear left Maxbilt tail light (YELLOW wire - brake/turn)
• Use 14 AWG wire from CT4 to junction points
• Use 16 AWG wire from junction to each individual light
• Wire Maxbilt tail lights per wiring table:
• BLACK wire → Ground (chassis ground)
• WHITE wire → Reverse lights (PMU Out 18)
• YELLOW wire → Brake/Turn (CT4 turn signal output + PMU Out 17 via diodes)
• RED wire → Marker/parking lights (PMU Out 9)
• Verify turn signals flash front and rear simultaneously
• Test lane change feature (< 0.5 sec press = 3 flashes)
• Verify brake lights work independently of turn signals

Headlight Wiring¶

• Route ignition signal from ignition switch RUN output (18 AWG) to CT4 ignition input (splits to PMU In 6, SwitchPros, CT4)
• Route CT4 main power from PMU Out 13 to CT4 12V supply
• Route CT4 SW3 output wire to LP6 Pin 1 (low beam, both lights in parallel, 14 AWG)
• Route CT4 SW4 output wire to LP6 Pin 4 (high beam, both lights in parallel, 14 AWG)
• Tap CT4 SW3 output wire to DRL cutoff relay coil (to disable DRL when headlights on)
• Verify headlight control (SW3 pull to turn on/off low beams)
• Test high beam control (SW4 push to switch between low and high beams)
• Verify CT4 provides mutual exclusivity (high beam disables low beam automatically)
• Verify headlights disabled when ignition off (ignition signal working correctly)
• Verify turn signals/hazards work with ignition off (hazard safety feature)

DRL/Parking Light Wiring¶

• Tap CT4 SW3 output (low beam circuit) to PMU In 7 for headlight status monitoring
• Configure PMU Out 9 DRL auto-off logic (see PMU programming section)
• Route 14 AWG wire from PMU Out 9 to DRL junction
• Route 16 AWG wire from junction to each light:
• License plate lights
• LP6 Headlight Pin 3 (DRL input) - both left and right
• Front 2" LED side markers (parking function) - both left and right
• Maxbilt tail light RED wire (marker/parking) - both left and right
• Verify all DRL/parking lights illuminate when ignition is turned on
• Verify DRL automatically turns off when headlights are activated (CT4 SW3)
• Verify DRL turns back on when headlights are turned off
• Test total current draw on DRL circuit via PMU diagnostics (should be ~8A)

GPS Module Installation¶

• Mount GPS antenna on dash top or near windshield for clear sky view
• Route GPS antenna cable to CT4 controller at steering column
• Connect GPS antenna to CT4 GPS input port
• Secure GPS antenna cable to prevent interference with controls
• Verify GPS antenna has unobstructed view of sky

Programming¶

• Program CT4 to battery control mode (not ignition control) for all switches
• Program CT4 to GPS turn signal mode (automatic cancellation based on speed/steering)
• Program SW3 (Headlights) to ON-OFF latching mode
• Program SW4 (High Beams) to momentary or ON-OFF (choose preferred behavior)
• Enable low voltage disconnect for all switches
• Disable flash/strobe (turn signals use built-in pattern, headlights should be solid)
• Disable switch memory
• Perform GPS calibration drive per CT4 manual instructions

Testing¶

• Test hazard function works with ignition off (verify battery power configuration)
• Verify turn signals flash at correct rate (front and rear synchronized)
• Test built-in audio module sounds when turn signals are active
• Test GPS auto-cancel by making several turns at various speeds
• Verify manual cancel still works (move lever to center or opposite direction)
• Test lane change mode (quick press <0.5 sec flashes 3 times, then auto-cancels)
• Test headlight control (SW3 pull to turn on/off low beams)
• Test high beam control (SW4 push to switch between low and high beams)
• Verify DRL automatically turns off when headlights are activated
• Verify DRL turns back on when headlights are turned off
• Test low voltage disconnect prevents over-discharge

Outstanding Items¶

• Determine GPS antenna mounting location (dash top or near windshield for best sky view)

Related Documentation¶

• Control Interfaces Overview - Main control interfaces overview
• Vehicle Lighting - Complete wiring details for all lighting circuits controlled by CT4
• Engine Systems - PMU specifications and programming