KSC2V7780 Trailer Hitch Harness Kit

Product Information: Trailer Hitch Harness Kit for 2022>
CX-5

The Trailer Hitch Harness Kit is a genuine accessory for the
2022> CX-5 model. The kit contains a main harness, tie mounts,
foam tape, red T-taps, tie wraps, a grommet, a panel removal tool,
a Phillips screwdriver, wire cutters, needle nose pliers, a tape
measure, and a female connector. The installation instructions
should be read carefully before proceeding with the installation.
The kit is designed to be installed without damaging the vehicle
paint or kit components. The bolts should not be over tightened and
should be tightened to the specified torque. The customer’s preset
radio stations should be recorded before installation. The negative
(-) battery terminal should be removed using a 10mm socket.

Product Usage Instructions

Before Installation

Read the installation instructions carefully before
proceeding.
Be careful not to damage vehicle paint or kit components.
Do not over tighten bolts, tighten to specified torque.
Record customers preset radio stations (if applicable).
Using a 10mm socket, remove negative (-) battery terminal.

Installation Steps

Step 1: Access Storage Compartments

Lift the rear hatch door and lower passenger seats behind the
driver seat. Temporarily remove the floor deck panel.

Installation Alert:

Vehicles equipped with BOSE sound systems will have a wire
harness located in the foam for the subwoofer. This harness needs
to be detached from foam before removing inserts to prevent damage.
The harness does not need to be unplugged from the subwoofer or
vehicle.

Step 2: Separating Weather Strip

Gently lift the rear weather strip away from the rear end trim,
but do not completely remove from the vehicle. Gently lift the rear
weather strip along the left trunk side trim, but do not completely
remove from the vehicle. Gently lift the rear weather strip along
the rear left passenger door starting at the top of the trunk trim
and stopping at the scuff plate.

Step 3: Rear End Trim Removal

Locate the left and right push nut pins on the threshold plate
and temporarily remove using a small flathead screwdriver.
The rear end trim is made up of 3 separate portions that are
attached. Each portion will need to be detached before the rear end
trim can be fully removed. Take note that all three pieces will
come out at the same time once they are all detached.
Firmly pull up on section 2a to detach from vehicle attachment
points and set aside.
Firmly pull up on section 2b to detach from vehicle attachment
points and set aside.
Firmly pull up on section 2c to detach from vehicle attachment
points and set aside.

Step 4: Removing Left Trunk Side Trim Fasteners

Locate driver’s side interior trim panel and follow sequence to
remove (a-b-c-d).
Temporarily remove push nut pin of trim panel using a small
flathead screwdriver for sequence (a).
Remove trim panel piece (b). Lift cover to access bolt and
remove using a 10mm socket wrench (Torque Spec 9.0 – 12.0 N
m).

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Part Number:
KSC2V7780 KSS2V7780
Package Contents:

GENUINE ACCESSORIES
Installation Instructions
Trailer Hitch Harness Kit

Applicable Models:
2022> CX-5

Installation Instructions
(QTY 1)

Tie Mounts (QTY 3)

Foam Tape (QTY 1)

Red T-Taps (QTY 4)

Large Tie Wraps (QTY 7)

Tie Wraps (QTY 10)

Grommet (QTY 1)

A
Panel Removal Tool
D
Phillips Screwdriver
G J

Main Harness (QTY 1)

Tools Required

Small Flathead Screwdriver
E

Trim Panel Remover
F

10mm Socket Wrench
H

Wire Cutters

Female Connector (QTY 1)
Before Installation
1.) Read installation instructions before proceeding.
2.) Be careful not to damage vehicle paint or kit components.
3.) Do not over tighten bolts, tighten to specified torque.
4.) Record customers preset radio stations (if applicable).
5.) Using a 10mm socket, remove negative (-) battery terminal.

Needle Nose Pliers

Tape Measure

Page 1 of 20

A ACCESS STORAGE COMPARTMENTS 1
1. Lift rear hatch door and lower passenger seats behind driver seat as shown. 2. Temporarily remove floor deck panel.
INSTALLATION ALERT
Vehicles equiped with a BOSE sound systems will have a wire harness located in the foam for the sub woofer. This harness will need to be detached from foam before removing inserts to prevent damage. Harness does not need to be unplugged from sub woofer or vehicle.

3. Temporarily remove jack and tow bar foam inserts. 4. Temporarily remove floor deck corner panel.
(Left side shown, repeat for the right side of the vehicle.)

Foam Inserts

BOSE wire harness

B SEPERATING WEATHER STRIP

1. Gently lift rear weather strip away from the rear end trim, but do not completely remove from vehicle.
2. Gently lift rear weather strip along the left trunk side trim, but do not completely remove from vehicle.

Rear End Trim

Weather Strip

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Continues on next page

3. Gently lift rear weather strip along rear left passeger door starting at the top of the trunk trim and stopping at the scuff plate.
3. Behind driver’s seat
Start Here Move Down

C REAR END TRIM REMOVAL
1. Locate left and right push nut pins on threshhold plate and temporarily remove using a small flathead screwdriver.
1
Push Nut Pins

Tools Needed:
Small Flathead Screwdriver

Left & Right
2. The rear end trim is made up of 3 seperate portions that are attached. Each portion will need to be detached before the rear end trim can be fully removed. Take note that all three pieces will come out at the same time once they are all detached.

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Continues on next page

2a. Firmly pull up on section 2a to detach from vehicle attachment points and set aside.
2b. Firmly pull up on section 2b to detach from vehicle attachment points and set aside.
2c. Firmly pull up on section 2c to detach from vehicle attachment points and set aside.
2

D REMOVING LEFT TRUNK SIDE TRIM FASTENERS

Tools Needed:

1. Locate driver’s side interior trim panel and follow sequence

to remove. (a-b-c-d)

a.) Temporarily remove push nut pin of trim panel using a

small flathead screwdriver for sequence (a).

b.) Remove trim panel piece (b). Lift cover to access bolt and

Small Flathead 10mm Socket

remove using a 10mm socket wrench. (Torque Spec 9.0 – 12.0 N m). Screwdriver Wrench

a cd

Left Trunk Side Trim

Page 4 of 20

Lift Cover to Access Bolt

c.) Remove trim panel piece (c). Carefully release latch cover

Tools Needed:

using a small flat head screwdriver. Remove phillips head

screw securing the lift handle to the vehicle.

d.) Remove trim panel piece (d), using a phillips head screw driver.

10mm Socket Small Flathead Phillips

Wrench

Screwdriver Screwdriver

E ACCESSING VEHICLE WIRE HARNESS BEHIND LEFT TRUNK SIDE TRIM
1. Carefully lift trim panel starting from inside driver side rear door area behind driver’s seat using trim panel remover tool.

Tools Needed:

1. Driver Side Rear Door Area

Panel Removal Tool

Trim Panel Remover

Locking Pin Locations
Note: Wrap end of trim panel remover in soft tape/clothe tape to prevent damage.
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Continues on next page

2. Use trim panel remover tool to disengage two locking pin locations along trim panel side. Revert to the panel removal tool to disengage locking pin locations along top portion of trim panel.
2. Driver’s side panel
Panel Removal Tool

Locking Pin Locations

Release Latch Cover

Start Here

Note: Wrap end of trim panel remover in soft tape/clothe tape to prevent damage.

3. Gently move the trunk side trim end away from vehicle body just far enough to access the OE harness & vehicle body located behind the trunk side trim. It is not necessay to remove the trunk side trim from the vehicle.
3

OE Harness

Vehicle Body

Page 6 of 20

EF ROUTE NEW 4-FLAT MOLD FROM HITCH TO INTERIOR OF VEHICLE Tools Needed:

4-Flat Harness Routing Overview Underside of vehicle shown (Exhaust removed for clarity)

Wire Cutters

5X
Large
Tie Wraps

Tape Measure

Exhaust removed for clarity Tow Bar

Tie Wrap
(f) Tie Wrap
(e)

Tie Wrap (a)

Tie Wrap (b)

Tie Wrap (c)

Tie Wrap (d)

Rear of Vehicle

INSTALLATION ALERT Note: Vehicle shown in 4-FLAT Harness Routing Overview image is not equiped with parking sensors. Vehicles equiped with parking sensors will look slightly different in the area where tie wraps (e) and (f) are attached. Please refer to step 5 for details.

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CRITICAL
STEP Due to the extremely high temperatures produced by the exhaust, a minimum clearance of 50mm MUST be maintained between the exhaust and all harness components at ALL TIMES. Failure to do so can result in severe harness damage and loss of trailer functions such as brake lights and/or turn signal lights.
a) Before fully tightening any tie wraps, confirm you have a minimum clearance of 50mm between harness and exhaust.

CRITICAL STEP
Critical Step: See Caution prior to performing step.

1. Secure the 4-flat trailer connector into the hitch bracket as shown. Route the the wire harness towards the cutout located on the bumper fascia mount (a). It’s important that the corrugated tube is routed over the edge of the bracket for protection. Use a large tie wrap to loosely secure the wire harness while keeping a 50MM CLEARANCE BETWEEN THE WIRE HARNESS AND ALL EXHAUST SURFACES as shown in the measurement photo 1b. Once clearance distance has been confirmed, rotate tie wrap head up into the bumper, remove all slack, fully tighten tie wrap, and trim with wire cutters.

1a
Up
Corrugated tube

1b Measurement Photo Corrugated

CRITICCARLITICAL STEP STEP

Tube

Edge of Bracket

Rotate Tie Wrap (a) Head Up

Exhaust
Exhaust
50mm

50mm

Edge of bracket

Harness

Tie Wrap (a)

CRITICAL STEP
It’s important that the corrugated tube is routed over the edge of the
bracket for protection. Damage to harness may occur otherwise.

Page 8 of 20

Continues on next page

2. Route the harness behind fascia

support bracket making sure the

harness is routed between the bumper

Support Bracket

fascia and bracket (b). Use a large tie wrap to secure the harness to the

(b) (a)

fascia. Tighten the tie wrap and trim

the tie wrap tail with wire cutters.

Tie Wrap (b)

CRITICAL STEP
3. Use a large tie wrap to loosely secure the wire harness to the bottom of the cross member of the hitch (c) while keeping a 50MM CLEARANCE BETWEEN THE WIRE HARNESS AND ALL EXHAUST SURFACES. Tie wrap should be located 100mm from the cross member end. Once distances have been confirmed, remove all slack from the harness before fully securing and trimming the tie wrap tail with wire cutters.

3- 4 Side View
Cross member bottom

CRITICAL STEP

50mm

100mm

Tie Wrap

(c)

Cross member

end

Tie Wrap (d)

Attachment bolt

CRITICAL STEP
4. Route the harness behind the rear most hitch attachment bolt and use a large tie wrap to loosely secure the harness to the hitch at the hitch split (d) while keeping a 50MM CLEARANCE BETWEEN THE WIRE HARNESS AND ALL EXHAUST SURFACES. Once the clearance has been confirmed, remove all slack from the harness before fully securing and trimming the tie wrap tail with wire cutters.

3- 4 Bottom View
Attachment bolt

Tie Wrap (c)
100mm

Tie Wrap (d)

CRITICAL STEP

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Continues on next page

INSTALLATION ALERT NOTE: It is not needed to perform both steps 5a and 5b. Perform only one based on the following:
– Follow step 5a for vehicles not equipped with rear parking sensors. – Follow step 5b for vehicles equipped with rear parking sensors.

CRITICAL STEP
5a. Use two large tie wraps to loosely secure the wire harness to the inside of the bumper at empty mounting points (e) and (f) while keeping a 50MM CLEARANCE BETWEEN THE WIRE HARNESS AND ALL EXHAUST SURFACES. Once distances have been confirmed, remove all slack from the harness before fully securing and trimming the tie wrap tails with wire cutters.

5a No Parking Sensors

Empty Mounting Points

Tie Wrap (e)

Tie Wrap (f)

CRITICAL STEP

CRITICAL STEP
5b. Use two large tie wraps to loosely secure the trailer wire harness to the rear parking sensor harness at points (e) and (f) while keeping a 50MM CLEARANCE BETWEEN THE WIRE HARNESS AND ALL EXHAUST SURFACES. Tie wraps should be located above the OE mounting clips for the rear parking sensor harness as shown in image. Once distances have been confirmed, remove all slack from the harness before fully securing and trimming the tie wrap tail with wire cutters.

5b Parking Sensors

Tie Wrap (e)

OE Parking Sensor Harness

CRITICAL
Trailer STEP Harness
Tie Wrap (f)

OE Mounting Clips

OE Parking Sensor Harness

CRITICAL STEP
After tie wraps have been fully tightened, reconfirm that all harness components have a minimum clearance of 50mm to the exhaust by using a scale to measure and confirm.
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Continues on next page

6. Locate and remove the existing cavity plug from the vehicle floor. Insert newly supplied grommet into existing cavity. Carefully route the 4 terminated harness wires from underneath the vehicle into the interior through the newly installed grommet.

Cavity Plug

4-FLAT wires

Tools Needed:
Grommet

Existing Hole

Grommet

7. Once the trailer harness has been routed through the grommet into the vehicle, confirm that the corrugated tube makes contact with the grommet underneath the vehicle and that the harness is located safely behind the bumper trim as shown in image.

Grommet

Bumper Trim
Trailer Harness
(f)
Page 11 of 20

G MOUNT MAIN HARNESS & CONNECT 4-FLAT HARNESS TO MODULE
Tools Needed:
1. Clean the indicated wire tie mount and module mounting areas

behind the driver’s side trim panel with an alcohol wipe. Remove

adhesive backing on module and tie mounts. Mount wire harness module and three tie mounts to specified locations.

3X
Tie Mounts

Tie Mount Locations

2. Insert the provided female connector to the four terminated wires. Firmly push terminal lock into the locked position.
Attach the 4-Flat harness connector to the module connector. The wires should match color to color at the connectors. (reference illustration).

Tie Wrap

Female Wire Cutters

Connector

Foam Tape
2

BROWN WIRE

WHITE WIRE

GREEN WIRE

YELLOW WIRE

TERMINAL LOCK ENGAGES HERE TERMINAL SIDE VIEW
Page 12 of 20

TERMINAL LOCK
Continues on next page

3. Use one piece of foam tape to protect connectors and to prevent rattle. 4. Use a tie wrap to secure connectors wrapped in foam tape to the main harness’s
mounting component as shown. 5. Cut excess tie wrap used in prior step with wire cutters.

Tie Wrap

Page 13 of 20

H MOUNT GROUND WIRE

Tools Needed:

1. Locate ground mount and ground wire connection.

2. Remove the existing ground mount bolt using a 10mm socket wrench.

Route the black ground wire from the main harness module to the bolt

location and tighten. (Torque bolt to 7 N m)

Wire Cutters 10mm Socket Wrench

3. Gently pull up on 4-Flat harness until corrugated portion on harness makes contact with

grommet on external portion of vehicle. While making sure corrugated tube is in contact

with grommet, use three tie wraps to secure 4-Flat harness and ground wire to the three

tie mount locations. Once secure, cut excess tie wraps.

Ground Mount

Ground Wire

Ground Mount

I ACCESS VEHICLE HARNESS & CONNECT WIRE TAPS TO VEHICLE HARNESS
1. Locate vehicle harness. 2. Expose vehicle harness wires by pulling back rubber casing sleeve.

Vehicle Harness Page 14 of 20

Continues on next page

3. Connect wire taps to vehicle harness on driver side. Locate and

Tools Needed:

identify the tail light (PINK), left turn signal (SKY BLUE), and stop

wire (RED), behind the driver’s side light. Attach a red T-tap to each of the indicated wires.
(a) place wire into the center jaw of the wire T-Tap splice.

3X
Needle nose Red T-Taps pliers

(b) fold wire tap around wire.

4. Connect main harness spade terminals to wire taps (Use chart for reference).

NOTE: ENSURE THE SPADE TERMINALS ARE

SECURELY SEATED INTO THE WIRE TAPS.

VEHICLE HARNESS WIRE COLOR CIRCUIT

PINK RED SKY BLUE

(4-WAY CONNECTOR) (4-WAY CONNECTOR) (3-WAY CONNECTOR)

TAIL LIGHT STOP LEFT TURN

Spade Terminals

VEHICLE HARNESS WIRE COLOR

PINK RED BSLKUYEBLUE

(4-WAY CONNECTOR) (4-WAY CONNECTOR) (3-WAY CONNECTOR)

ACCESSORY WIRE HARNESS COLORS
BROWN BLUE/BLACK YELLOW

5. Plug the wire harness connection back in.
5

Page 15 of 20

J REMOVE PRIMARY LOCK ON REAR JUNCTION CONNECTOR

Tools Needed:

1. Disconnect the rear junction connector by pushing down on the black primary lock and tilting back to release. Once connector is free, lock must be returned to its closed position before removing.
2. Remove black primary lock by using a small flathead screwdriver to pry and carefully lift the lock on both mating sides.

Small Flathead Screwdriver

Primary Lock

K DISENGAGE SECONDARY LOCK & INSERT RED POWER WIRE

Tools Needed:

1. Disengage secondary lock on rear junction connector by carefully using a small flathead screwdriver or terminal removal pick tool.
2. Route the red power wire to the rear junction connector. Locate proper cavity to be populated (see illustration). Once terminal is properly engaged in connector, squeeze secondary lock into place.

Small Flathead Screwdriver

Secondary Lock

Red Power Wire

Page 16 of 20

FROM OPPOSITE END

L REASSEMBLE REAR JUNCTION CONNECTOR & REMAINING T-TAP WIRE

Tools Needed:

1. Locate BLUE wire on rear junction connector for T-Tap connection.

2. Use a T-Tap on BLUE wire of the rear junction connector.

Tie Wrap

Red T-Tap Wire Cutters

3. Confirm the secondary lock has re-engaged and place the black primary lock back on the connector. Make sure primary lock is disengaged and in the down position before inserting back into junction connector. Reassemble and insert the rear junction connector back in place. Primary lock should auto lock in place.
4. Snap in remaining green main harness wire to T-Tap connection. 5. Tie wrap green main harness wire onto cable above main harness and cut excess tie wrap.

M FINISHING STEPS

1. Seal the replacement grommet with silicon to prevent any

possible water instrusion.

2. Reinstall all trim, tie downs and interior panels in reverse order

of removal, ensuring all fasteners are properly installed.

3. Clean vehicle.

4. Vacuum and clean any debris caused by installation.

5. Place installation instructions int he glove box of vehicle.

6. Connect negative (-) battery terminal.

Page 17 of 20

TROUBLESHOOTING GUIDE

PPAARRTTNNUUMMBBEERR:: K0S0C002-V87E7-8R007A K0S0S020V-8797-8R032A

AAPPPPLLICICAABBLLEE MMOODDELS:

TRAILER HITCH WIRING KIT

20210722>>CCXX–55

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Fig. 1 – Fuse Replacement Fuse Cover Panel

Fuse Relay Box

Fuse Location

Fuse Cover Panel Location

Remove fuse relay box cover panel from underneath the dashboard on the driver side of the vehicle.
Page 18 of 20

15 amp fuse will be located in cavity labeled ESCL of the fuse relay box.

PART NUMBER:: 0K0S0C02-8VE7-7R8007A 0K0S0S02-8V97-7R8302A

INSTALLATION INSPECTION

APPLICABLE MODELS:

TRAILER HITCH WIRING KIT

2022> CX-5

Inspect the installed / reinstalled parts for the following items:

Inspection Parts

Clearance/Fit

5500MmMmCLBEeAtRwAeNeCnEEBxEhTaWuEsEt N&THHaErWneIRsEs
HARNESS AND ALL EXHAUST SURFACES

Tow Harness Functions Tow Harness Tow Harness Module Ground Screw
Driver’s Side Left Rear Interior Trim Panel Passenger Side Right Rear Interior Trim Panel Rear Threshold Plate Rear Foam Inserts Rear Floor Covering
Vehicle Negative Power Cable 4-FLAT Harness

Scratches/Dirt/ Harness
Interference

Installation/ Tightening/ Engagement

Operation Check

Notes: 1. Verify signal functionality at the trailer harness plug using test procedure on page 16. 2. Ensure tow harness module ground bolt is torqued to 7.0 N m.

Page 19 of 20

CAUTION
!
When the battery is disconnected, the DSC may stop operating. (The DSC OFF indicator will flash at this time, and the TCS/DSC operation indicator will illuminate.)
1. Turn the ignition switch to “OFF” and then turn it back to “ON”. 2. Turn the steering wheel clockwise as far as it will go, and then turn it back counterclockwise as far as it
will go. 3. Check that the TCS/DSC operation indicator is turned off. 4. Turn the ignition switch to “OFF” and then turn it back to “ON”. 5. Check that the TCS/DSC operation indicator is turned off. If the TCS/DSC operation indicator is still
illuminated or the DSC indicator is not turned off when the ignition switch is turned back to “ON”, contact your Mazda dealer.
CAUTION
! If the battery is disconnected, the power windows may no longer fully open or fully close automatically. 1. Turn the ignition key to the “ON” position. 2. Press the power window switch to fully open the power windows. 3. Lift up the power window switch to fully close the power windows, and keep it pulled up for approximately 2 seconds. 4. Position the engine switch at “OFF”, and then at “ON” again. When the function doesn’t work after these procedures, please contact your Mazda dealer.
CAUTION
!
Due to the extreme high temperatures produced by the exhaust, a minimum clearance of 50mm must be maintained between exhaust and harness. Failure to do so will result in severe damage to harness and loss of trailer functions, such as brake lights and turn signal lights.

Date Vehicle VIN

Checked

Page 20 of 20

Person in Charge