Unfortunately no takeover on the RDX. Even Fortin shows the same thing. Check out their guide, it shows where the wires are with pictures.
https://ifar.ca/en/download/6161/evo-all_acura_rdx_-_push-to-start_%282013%29.rev-20121019.pdf
Here is a wiring guide per Directwire -
DIRECTWIRE™ WIRING INFORMATION - ACURA / RDX / 2013 / Remote Start
12volts white (50A) + Power Control Unit right of strng column, green 1 pin plug, pin 1
Starter gray + Power Control Unit right of strng column, blue 36 pin plug, pin 9
Second Starter brown (SS2) (push-button start) - Power Control Unit right of strng column, blue 36 pin plug, pin 12
Ignition blue + Power Control Unit right of strng column, white 4 pin plug, pin 1
Second Ignition red + Power Control Unit right of strng column, white 4 pin plug, pin 2
Third Ignition N/A
Accessory orange + Power Control Unit right of strng column, white 4 pin plug, pin 4
Second Accessory purple + Power Control Unit right of strng column, blue 36 pin plug, pin 8
Keysense pink - Power Control Unit right of strng column, blue 36 pin plug, pin 5
Power Lock use factory alarm arm
Power Unlock use factory alarm disarm
Lock Motor lt. blue 5 wire dash fuse box, 44 pin plug (B), pin 15
Unlock Motor gray 5 wire driver kick, door harness, 23 pin plug, pin 4
Parking Lights+ red + dash fuse box, 44 pin plug (B), pin 35
Parking Lights- gray - headlight switch, 12 pin plug, pin 8
Hazards purple + hazard switch, 4 pin plug, pin 3
Turn Signal(L) yellow + dash fuse box, 44 pin plug (B), pin 4
Turn Signal(R) brown + dash fuse box, 44 pin plug (B), pin 12
Reverse Light gray + dash fuse box, 44 pin plug (B), pin 21
Door Trigger green - dash fuse box, 44 pin plug (B), pin 40
Dome Supervision pink - dash fuse box, rear, 13 pin plug (N), pin 6
Trunk/Hatch Pin blue - dash fuse box, 44 pin plug (B), pin 22
Hood Pin gray - dash fuse box, 38 pin plug (C), pin 27
Trunk/Hatch Release pink (rear handle switch) - driver kick, 24 pin plug, pin 15
Notes: On vehicles with power tailgate, when the power tailgate switch on the dash is pressed, it connects the two brown wires at the power tailgate switch, 6 pin plug, pins 1 and 2.
Power Sliding Door N/A
Factory Alarm Arm orange (key lock), yellow (lock detection) both - power window master switch, 37 pin plug, pins 35 and 33
Factory Alarm Disarm brown (key unlock), pink (unlock detection) both - power window master switch, 37 pin plug, pins 34 and 32
Disarm No Unlock see factory alarm disarm
Tachometer green, red, blue, tan, pink, or lt. blue ac any fuel injector, 2 pin plug, pin 2
Wait to start N/A
Brake Wire lt. green + Power Control Unit right of strng column, blue 36 pin plug, pin 36
Parking Brake lt. blue - Power Control Unit right of strng column, blue 36 pin plug, pin 33
Horn Trigger orange or brown - horn switch or dash fuse box, 38 pin plug (C), pin 37
Memory Seat 1 lt. green - power window master switch, 37 pin plug, pin 22
Memory Seat 2 red - power window master switch, 37 pin plug, pin 23
Memory Seat 3 N/A -