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Looking for a 10th gen wiring diagram?
2018 Honda Civic Lx 4 door Sedan

Thanks.

 
Rep Power: 512

what specific system you looking for a wiring diagram for?

 
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Viper 350 PLUS 3105V 1-Way Car Alarm Keyless Entry

 
Rep Power: 126

I’m pretty sure that should’ve come with the kit.

 
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Courtesy of mgoetz74 of 12Volt:

2018 Honda Civic
12 Volts Green (50A) + Ignition Switch, white 5 pin plug, pin 1
Ground (chassis ground)
Starter Yellow + Ignition Switch, white 5 pin plug, pin 5
Ignition Blue + Ignition Switch, white 5 pin plug, pin 2
CAN Bus High White (F-CAN) Data OBD-Data Link Connector, white 16 pin plug, pin 6
CAN Bus Low Red (F-CAN) Data OBD-Data Link Connector, white 16 pin plug, pin 14
CAN Bus High 2 Pink (B-CAN) Data Immobilizer Module on key switch, gray 7 pin plug, pin 4
CAN Bus Low 2 Blue (B-CAN) Data Immobilizer Module on key switch, gray 7 pin plug, pin 5
OBD 12 Volts Red (10A) + OBD-Data Link Connector, white 16 pin plug, pin 16
OBD Ground Black - OBD-Data Link Connector, white 16 pin plug, pin 4
Power Lock (use factory alarm arm and lock detection)
Power Unlock (use factory alarm disarm and unlock detection)
Power Lock2 Blue (if needed) - BCM behind dash fuse box, blue 36 pin plug, pin 27
Power Unlock2 Violet (passenger doors) (if needed) - BCM behind dash fuse box, blue 36 pin plug, pin 32
Power Unlock - Driver Door Green (if needed) - BCM behind dash fuse box, blue 36 pin plug, pin 31
Lock Motor Tan Reverse Driver Kick, door harness, blue 25 pin plug, pin 21
Driver Unlock Motor Lt. Green Reverse Driver Kick, door harness, blue 25 pin plug, pin 14
Passenger Unlock Motor Yellow Reverse Dash Fuse Box, rear, 18 pin plug, pin 9
Factory Alarm Arm Violet - Power Window Master Switch, 37 pin plug, pin 3
Factory Alarm Disarm Red Double - Power Window Master Switch, 37 pin plug, pin 4
Lock Detection Yellow - Power Window Master Switch, 37 pin plug, pin 18
Unlock Detection Lt. Blue Double - Power Window Master Switch, 37 pin plug, pin 17
Parking Lights Gray + Driver Kick, harness to rear
Parking Lights - Gray - Headlight Switch, white 12 pin plug, pin 8
Hazards Green - BCM behind dash fuse box, gray 28 pin plug, pin 2
Turn Signal (Left) Lt. Blue (LF with LED); Gray (LF and/or LR) + BCM behind dash fuse box, blue 36 pin plug, pin 18 (LF with LED); pin 17 (LF and/or LR)
Turn Signal (Right) Green (RF with LED); Tan (RF and/or RR) + BCM behind dash fuse box, blue 36 pin plug, pin 35 (RF with LED); pin 34 (RF and/or RR)
Headlight Yellow - Headlight Switch, white 12 pin plug, pin 7
AutoLights Pink - (Off) Headlight Switch, white 12 pin plug, pin 1
Left Front Door Trigger Green - BCM behind dash fuse box, gray 40 pin plug, pin 22
Right Front Door Trigger Lt. Green - BCM behind dash fuse box, gray 40 pin plug, pin 23
Left Rear Door Trigger Brown - BCM behind dash fuse box, gray 40 pin plug, pin 24
Right Rear Door Trigger Gray - BCM behind dash fuse box, gray 40 pin plug, pin 28
Dome Light Violet - BCM behind dash fuse box, white 14 pin plug, pin 13
Trunk/Hatch Pin White - BCM behind dash fuse box, gray 40 pin plug, pin 27
Hood Pin Blue - N.C. BCM behind dash fuse box, gray 28 pin plug, pin 19
Trunk/Hatch Release Lt. Green - Power Window Master Switch, 37 pin plug, pin 9
Trunk Release Motor Green Reverse Dash Fuse Box, green 22 pin plug, pin 8
Fuel Door Release (locks/unlocks with driver door)
Tachometer Lt. Violet/White (2.0L); Green (1.5L-T, 2.0L-T) AC Camshaft Position Sensor, engine driver side rear, 3 pin plug, pin 3 (2.0L, 1.5L-T); pin 2 (2.0L-T)
Fuel Pump Green + Driver Kick, harness to rear
Horn Trigger Tan - BCM behind dash fuse box, blue 36 pin plug, pin 30
Horn Trigger 2 Tan (alternate location) - Horn Switch-Clock Spring, 20 pin plug, pin 10