DIY Factory Tow Package using OEM parts with Forscan As-built Data (without error codes)

[Tofudude]

I also added the tow light check function in the APIM. This is super handy and everyone should have this.

Do you happen to have a screen shot of the line you change to turn this function on?

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[RoverDude]

It's in the apim easy mode (Forscan) label trailer lamp check I believe, or something very similar.

At least for me. If I enable I have the option, but actually doesn't work, and gives an error message right away.
It is not enabled on factory or via FDRS.

 

[1986Bronco]

RoverDude got it. APIM and easy mode on Forscan.

Works perfectly here. Runs through cycles of left, right, headlights, brakes, reverse, etc.

 

[DoubleADuster]

OP- This may be a silly question but should I make the entire line in each module match your screenshot or just change the values you indicated. I have a 21 2.7, some of the body control lines are totally different. If I change just the values you indicate is that expected to make this successful?

 

[RoverDude]

I would not change the entire line...
Send me a PM with what you have, or p.m. your vin, can look up your asbuild.
I'll get you back this afternoon/evening when I get home.

 

[CarbonSteel]

@RoverDude - I completed the install of the hitch, wiring harness with 4/7 pin plug and module as well as the trailer brake controller.

I have no errors on any screens. Is that because neither the hitch or brake controller has been enabled yet?

I have a 2023 Wildtrak.

Thanks!

 

[RoverDude]

Unable to determine based on I don't know how the module came programmed in.
Did you use the kit?

Keep in mind when I wrote this originally there was not factory kit .

You could try to dummy out or attach a trailer to confirm that blindspot has been disabled or knowledge a trailer has attached.

The error was only because the trailer module was not programmed for the Ford Bronco.
If you have a trailer tester and everything's good you should be okay.

Keep in mind the brake controller and the trailer module need to see a resistance that typical LEDs do not show.
I eat I would use a old school trailer lamp or light bulb, 5w+ for testing.

Send me p.m. if you have any questions

 

[CarbonSteel]

Unable to determine based on I don't know how the module came programmed in.
Did you use the kit?

Keep in mind when I wrote this originally there was not factory kit .

You could try to dummy out or attach a trailer to confirm that blindspot has been disabled or knowledge a trailer has attached.

The error was only because the trailer module was not programmed for the Ford Bronco.
If you have a trailer tester and everything's good you should be okay.

Keep in mind the brake controller and the trailer module need to see a resistance that typical LEDs do not show.
I eat I would use a old school trailer lamp or light bulb, 5w+ for testing.

Send me p.m. if you have any questions

Are you thinking I do not need to do any Forscan programming? I did use Ford kits for both trailer hitch and brake controller.

 

[RoverDude]

Module will give you your turn signal and your brake lights, etc.

If you don't change additional settings, The Bronco doesn't actually know you have a trailer attached. The blind spot will not be disabled, sway control will not necessarily be enabled, same with sway control.

Is sway control an option for you?


I guess I'm saying you have all the options, the trailer hitch works...
But you may not have all the benefits that you could have....

 

[CarbonSteel]

Module will give you your turn signal and your brake lights, etc.

If you don't change additional settings, The Bronco doesn't actually know you have a trailer attached. The blind spot will not be disabled, sway control will not necessarily be enabled, same with sway control.

Is sway control an option for you?


I guess I'm saying you have all the options, the trailer hitch works...
But you may not have all the benefits that you could have....

OK, I'll have to look at Forscan, but I'm thinking the settings that you had may not be the same that I need since mine is a 2023 and came "readier" for the install.

 

[1986Bronco]

Mine is a 1st quarter 2023.

Just using the Lumen wiring kit gave me a working trailer hookup.

Forscan is what added the towing mode options in center stack, power for the 7-pin, and peace of mind.

Basically, you are good to go without any Forscan changes if you are just using the 4 pin.

A couple of posts back you can read my fight with Forscan to get rid of an error in the module. There were never any error codes on the dash, just in Forscan for the module.

I finally got it hashed out with check-ins from RoverDude.

 

[1986Bronco]

Also, for the most part, I had to use RoverDude's settings

 

[CarbonSteel]

Also, for the most part, I had to use RoverDude's settings

Sounds good. I have a 3rd quarter 2023.

I plan to make a backup of all settings before tinkering.

I definitely need the brake controller and 7 pin connector to work.

 

[B22-2023]

I wanted to have the factory hitch for my Bronco, but that was not an option. I have gotten all the parts separately and have a complete OEM solution for adding the factory tow package to my 4 door First Edition. I have everything installed and have been able to configure it in Forscan to have no error codes and everything works!

While I did take my time, it was relatively easy (aside from figuring out how panels pop off without breaking).

So here is my little write up, hope it helps others. This is the progression I did it, not necessarily the best order of operations. I am sure I missed some steps from memory and clearly didn’t take enough pictures.


Adding the Trailer Hitch Assembly:

Parts needed:
MB3Z19D520A (Ford Trailer Hitch Assembly)

Tools need:
10mm
13mm
15mm
18mm
Torque wrench

Tips / suggestions:
Towel / cardboard
An additional pair of hands (or 2)

The installation took me just under an hour solo. Instructions that come with the hitch are straight forward. The instruction leave out the unclipping (removal) of the wire connection on both sides of the bumper. (1) is for the backup sensors, the other (1) is for the license plate light.

• Remove (1) 13mm at the back other bumper in the wheel arch.
• Remove the bolts on the tow hook(s) 18mm

TIP: Open the tailgate first, then remove the (6) bolts that attach the bumper, while a drinking buddy holds the bumper in place / keeps it from falling on you.

• Remove the bumper placing it on towel, cardboard, or grass
• Install hitch and properly torque bolts
• Reverse the bumper removal (reinstall bolts and reconnect wiring)
• Stand back a gaze at your accomplishment!

Adding the Trailer Tow module

Parts needed:
M2DZ-19H332-A (Trailer tow module)
W520101-S442 (nuts to hold tailer module) (you need 3, 4 come in (1) package

Tools need:
10mm nut driver/socket etc.

Tips / suggestion:
Panel trim poppers (under $20 on amazon)


Remove rear driver side cargo trim panel

• There will (3) connectors sitting on a terminal block with wires
• Remove female connectors by pushing the tabs down. What is remaining is the male Connectors without pins
• Remove the remaining terminal block and discard (or save for the future, it's your trash)

TIP: Run one nut (the extra one) down on each of the 3 posts to help remove the paint on the thread before installing the tow module.


I would Highly advise to disconnect the battery prior to attaching the module.

• Install the Module with bracket attached.
• Plug in the (3) connectors to the Tow module.
• Reconnect battery.
• Check with Forscan to verify the system can see the module (you may need to start a new profile)
• Clear any error that may be caused from disconnecting the battery.

You will at this point have an error "2100 initialization Error" on the TRM in Forscan, This will be fixed later.

Leave panel off for additional step (running wire)

• Stand back a gaze at your accomplishment!

SIDE NOTE:
What / how this module works (my understanding)
Connector on left has can buss connection, a theft signal, and a ground
There are (2) fused hots: Fuse91 (40A) powers the unit - this is what creates the Left Signal, Right Signal, and Parking Lights Fuse107 (30A) feed goes to an internal relay and out on the orange wire (battery charger connection).
This trailer battery relay will not work until configured in Forscan (based on my experience).
All these outputs then run back up to the front wheel well on the driver side.
To save wire you, could pick-up some of those connections at the module (left, right, and battery changer) vs from the front of the vehicle

Adding The Ford Trailer Brake Controller

Parts needed:
VM2DZ-2C006-A (Ford Trailer Brake Controller / Redarc)
Dual lock Tape
Zip Ties
terminal rig for 12-gauge wire
shrink tubing

Tools:
8mm nut driver
12mm nut driver
Scissors
1/4 (double check size)
painter tape
pencil
3/8" washer (rubber)
de pinning tools

• Pull driver side lower panel out by pulling towards you from top, it swings down.
• Remove the exposed metal plate by removing the (2) 8mm screws out. (Metal plate is sharpish, so watch your fingers)
• Cut and attach the dual lock tape to back area of plate.
• Cut and attach dual lock tape to back of brake controller
• Attach wiring to controller, and controller to the plate.
• Attach the power cable/ connector to connector above the accelerator (there will be a cover on the existing connection)
• Zip Tie power wires out of way to prevent cable assembly from falling in the pedal area
• Reconnect plate with 1/2 wired controller
• Unplug and remove the light switch module
• Put painter tapes on unused area of light switch module (right side)
• Mark the center / (very slightly off center to the right side)

TIP: outline /trace around the trailer knob button where you what the knob to be, then drill the center of that location. With the entire module outside the vehicle (like on a work bench)

• Attach the switch with a 3/8" rubber washer (on back side) to add a little thickness and grip.
• Tighten with 12MM nut driver (when it stops turning its tight Hercules! It’s only made from plastic!)
• Reinstall light switch module, plug in light switch module.
• Plug in brake controller connector to switch you just added. Zip tie excess cable neat and close driver panel.
• Turn metal knob on brake controller fully counter close wise
• Install trailer switch button cover with 0 at top
• Turn until 5 is pointed at top (12 o clock position and trailer icon should be level with the horizon)

Note: The button will not light up consistently or not at all at this point. It requires a load (5-21w RESISTIVE load)

I did not see this in the included Ford’s material BUT: "The Tow-Pro™ Elite will check for shorts on the trailer wiring and a cold 55W bulb has an initial “inrush” current as it first warms up that exceeds the trip point, and the Tow-Pro™ Elite will see this as an intermittent wiring short. "

• Stand back a gaze at your accomplishment!

Adding the Ford trailer 7/4 pin plug and WIRING

Parts needed:
M2DZ-14A666-B (Ford trailer 7/4 pin plug with bracket)
WPT-1659 Ford trailer connector pigtail (Amazon)
(25') 16-gauge Gray GXL wire
(25') 16-gauge Yellow GXL wire
(25') 16-gauge Green GXL wire
(25') 14-gauge Blue GXL wire
(25') 14-gauge Brown GXL wire
(25') 14-gauge Orange GXL wire
(25') 12-gauge White GXL wire (you don't need that much probably only 10')
Tesa Wire loom tape
Zip Ties
Motorcraft TA-29 (silicone sealant)
Super 33 electrical tape
1/2" convoluted tubing


Aptiv terminals (From Mouser and Newark)
FEMALE 2.8MM TERM 14-16 AWG TIN (10762803-L)
FEMALE 1.5MM TERM 14-16 AWG TIN I order a WPT-1037 terminal kit (NOT PIGTAIL VERSION) as I could not get the 1.5mm terminals solo in stock anywhere online
FEMALE 2.8MM CBLE SLD 14/16 TERM (13627267-L)
Female 6.35MM SN Sealed Terminal (33351052)



Tools:
Wire stripers
Terminal Crimper (amazon)
various socket/nut driver (I didn't write them all down)
screwdriver
Panel / trim poppers
Terminal de pining tools / kit (Amazon ST5211) not great but got the job done
7/4 pint plug tester



Steps:

• Disconnect battery.
• Remove front drivers side fender flare and wheel well liner

Note: I didn't feel I needed to remove the tire but removing it will give more working room.

• Undo connector C201 by pulling the retaining tab back and pushing up on the connectors. (I use a small control screwdriver and wedged it between the tab and body of the connector, this step is all done by finger feel as you cannot see any of these tabs by sight. Reference the connectors taken off during the trailer tow module step)
• Undo the back of the female connector and carefully break off/ remove tabs for positions new wires are going (pins 15-19)
• Remove the front white terminal cover.
• Pull wire through back plastic retainer and gasket
• Strip and crimp wire and (5) female terminals (10762803) and push into place (confirm the correct orientation prior pushing it in / it will not set correctly upside down. This can be done by looking at the front of the connector and looking at the terminals position.
• Reassemble the connector
• Repeat steps for the other connector C105 but this time it's only position 40 and it a 1.5mm terminal. (From the WPT-1037 terminal kit)
• Back at the tow module, strip, and crimp the12-gauge white return/ ground wire (sliding on shrink tube prior) to a terminal ring.
• Use the same bolt as the ground lug that is connected above the tow module to connect your newly terminated white wire.

Note: This ground wire will be picked and ran with the other wires you terminated from the front (from C201 and C105) when those 6 wires pass the tow module / Ground terminal)


Note: At this point you should be able to test the wiring prior to running all the wires back to the rear. Until you configure Forscan properly everything should work except the battery charger (orange wire) (take a sneak peek at the Forscan setting below for proper configuration for 100% assurance)

As noted prior, you need to have the proper resistive load on the trailer brake to show proper operation.

• Snap connector back into holders
• After testing, tape and shape the wires and then run to/ through the rubber gasket in the engine bay / above driver left foot position.
• Use a razor / exacto knife to cut a small asterisk shaped hole through gasket/gromet. (Use wire harness tape on wire assembly)

TIP: Prior to running the wires into and through the vehicle, make a small templet for the wires by drilling (6) holes in a scrap piece of wood. Then pulling wire through this and taping a single wrap of tape about every 10”. It will keep wires neat, untwisted/ and keeping it shape, and much easier to work with.

• Zip tie wire assembly in engine bay neatly and seal hole in Rubber gasket with silicone
• Remove all the plastic side panels on the driver side front to the back to be able to run the wires.

NOTE: The front driver panel is also held in by (2) Nuts located under the left footrest. The top of that footrest does pop off with a trim popper. If not removed you will break the plastic when you try to remove the panel and must glue it back together (Been there, did that!)

• Run wire back to driver side rear brake light.
• Use harness tape where wire would be subjected to damage (tape the new wires in location where existing wires are also taped)
• I removed the existing zip ties and re zip tied after I had wires run out and down into bumper.
• Add white ground wire to your wire harness assembly when it passes the tow module / ground lug location.
• Remove drivers’ side rear brake light
• Cut a hole in the rubber gasket, run wire assembly though and seal with silicon once wires are out of gasket,
• From behind the brake lights area to the 7pin connector, cover / protect wires with convoluted tubing that is wrapped with electrical tape.
• Secure tubing to bumper with zip ties.
• Run wire / tubing to the location the WPT-1659 (7-pin) connector will rest.
• Using a depinning tool remove the front cover.
• De-pin (1) existing terminal, carefully prying and removing existing boot seal.
• Reuse the old boot seal on the new wire(s) you ran; strip and crimp to the correct size terminal. (White wire / ground is the 6.35mm, all 6 others are 2.8mm in size)
• Repeat for all 6 remaining terminals and reattach front cover.
• Attach connector to 7/4 pin connector, and fasten bolt to hitch/ receiver.
• Reattach everything you removed (taillight and driver side trim panels) and clean up mess
• Reconnect Battery.

Forscan Changes

Below is a list of changes I made based on comparing multiple Bronco’s as built data that had the factory installed hitch.
(2.7 with 10 speed)

The Table below shows the final values I used.
Red Data is what I changed it to.
Orange is just the checksum value. (last 2 values)

Update:
(Below Values are slightly different if you have a 2.3 and a Manual)

When I change JUST the TRM data to the values as shown, that cleared up the 2100 initialization error in Forscan AND enable the battery charger relay to work in the TRM module.

Because I installed the TRM module, the prior values shown are just how it was programmed when I installed it.
This data is based on comparison of other vehicles as built data where the only difference was the hitch. It works for me, use at your own risk!!

Hopefully this will help someone.

@RoverDude - Excellent job, this helped me get mine installed. Forscan question: I’ve done a lot of programming on my Bronco and F-150, and never considered the Checksum (In Orange on your table). When making the changes, do I just stick to your Red entries, or is there something to do about what you have listed in Orange?

Many Thanks!

 

[RoverDude]

Red values should be all you need to change.

Forscan should calculate the needed last 2 bits (Checksum)
For the trailer control module, if need to make corrections, Write all for that module.

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