curt ECHO 51190 User manual

PAGE 1 •51190-INS-RC •87 7.2 87.8 634 •NEED ASSISTANCE? •CURTMFG.COM
51190
ECHO®UNDER-DASH
TRAILER BRAKE CONTROLLER
INSTALLATION MANUAL
TABLE OF CONTENTS
2
3
1
1. Main module
2. Main module adhesive pad
3. Four 8" zip ties
CONTROLS & COMPONENTS
Controls & Components Page 1
Before You Begin Page 2
Wiring Page 2
Wiring Diagram Page 3
Set Manual Control Output and Brake Light Switches Page 3
Mounting the Main Module Page 3
Downloading the Mobile Application Page 4
Initial Setup for Bluetooth Connection Page 4
Application Setup Page 5
Adding a Profile Page 5
Activating a Profile Page 5
Modifying or Deleting a Profile Page 5
Configuring Profile Settings Page 6
Test Drive & Adjustment Page 7
LED Status Indicator Page 7
Troubleshooting Guide Page 8
NOTICE
This device contains license-exempt transmitter(s) /
receiver(s) that comply with Innovation, Science and
Economic Development Canada’s license-exempt RSS(s).
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference, including
interference that may cause undesired operation of the device.

CURTMFG.COM •NEED ASSISTANCE? •877.287. 86 34 •51190-INS-RC •PAGE 2
IMPORTANT: Read and follow installation manual carefully.
Failure to do so could result in damage to the brake control unit,
loss of trailer brakes or poor brake performance.
Disconnect the electrical plug between the trailer and tow vehicle
before testing a breakaway switch. Failure to disconnect may
damage the brake control unit. Avoid mounting the brake control
module near a CB radio or other RF transmitter.
The main module must be mounted firmly in place.
Failure to do so could lead to improper operation and / or brake failure.
The main module's positive (with 30-amp circuit
breaker) and ground wires must be connected directly to the tow
vehicle's battery using a minimum of 10-gauge stranded wire.
Connecting to existing wiring or an alternate ground may damage
the vehicle's circuits, lead to failure of the brake control module,
loss of trailer brakes or vehicle fire. Note: Removal of the factory
quick plug can void the warranty.
This product IS NOT compatible with Apple CarPlay or Android
Auto, however it will not interfere with these features.
This product is deigned to provide a Bluetooth connection,
without obstructions, up to 50 ft. connection may also be
limited by the Bluetooth signal of your device.
Avoid distracted driving. Only make
adjustments when the vehicle is stationary. Please adhere to
all applicable traffic laws and motor vehicle safety regulations
including, but not limited to, all laws and regulations prohibiting
the use of handheld devices while operating a motor vehicle.
OneControl®app must be operating in the foreground
of your cell phone applications. Operating the App in the
background of your cell phone applications may cause delays in
braking response when using the manual override button.
Do not mount the Echo®near the
exhaust pipe. Failure to do so may result in
heat damage, loss of functionality and risk of fire.
NOTICE
Prior to driving, test all trailer lights
while the trailer is plugged into the Echo®.
• Brake control harness, supplied with the tow vehicle (if equipped)
• CURT quick plug harness - custom connector for specific vehicles
(see the CURT catalog for availability)
• CURT #51515 / #51516 - quick plug with pigtails
• CURT #51500 - universal brake control wiring kit
One or more of the following may be needed for installation:
WIRING
Disconnect the tow vehicle's negative battery terminal from its
battery post before beginning the installation process. Most trucks
and utility vehicles are equipped with a plug from the factory that
allows quick brake control installation. Check the vehicle owner's
manual for plug availability, location and installation. If the mating
plug supplied with the vehicle is no longer available, a CURT quick
plug can be used. See the CURT catalog or visit curtmfg.com
for application information. For tow vehicles not equipped with
a factory brake control plug, we suggest purchasing the CURT
universal brake control wiring kit #51500.
Mount the 30-amp, auto-reset circuit breaker
as close to the battery as possible.
IMPORTANT: When passing wires through sheet metal, always
go through an existing grommet. If there is no grommet, install one
or use silicone sealant to protect the wires from sharp edges.
Insert two 10-gauge wires, one white and one black, from the
mounted brake control to the battery area. Using a ring terminal,
connect the black wire to the 'AUX' side of the 30-amp circuit
breaker. Leave the white wire to be connected later. Using a
10/12-gauge butt connector, attach the black wire from the 'AUX'
side of the 30-amp circuit breaker to the brake control's black
wire. Again using a 10/12-gauge butt connector, attach the white
wire from the battery area to the brake control's white wire. Run
a 10-gauge blue wire from the tow vehicle's trailer plug 'BRAKE'
terminal to the brake control. Using a 10/12-guage butt connector,
connect this wire to the brake control's blue wire.
NOTICE
If the device application cannot connect to the unit due to
an incorrect or missing PIN, contact CURT product support. They
will need the serial number located on the label of your unit.
BEFORE YOU BEGIN

PAGE 3 •51190-INS-RC •87 7.2 87.8 634 •NEED ASSISTANCE? •CURTMFG.COM
WIRING DIAGRAM
SET MANUAL CONTROL OUTPUT
AND BRAKE LIGHT SWITCHES
There are two small
switches located at the
front of the unit, next to
the port on the module.
Once accessed, the switch
positions can be changed
using a small pointed tool.
In the illustration above, the switch on the left (#1) controls the
unit's brake light activation feature. The factory default setting is
the 'ON' position with the switch down. This setting activates the
tow vehicle and trailer brake lights when the manual control is
actuated. Moving the switch up to the 'OFF' position turns off the
brake light activation feature and the brake lights are not activated
when the manual control is actuated.
In the illustration above, the switch on the right (#2) controls
the level of output available to the trailer brakes when using the
manual control. The factory default setting is the 'ON' position with
the switch down. This setting limits the manual control output to
the level set using the output control. Moving this switch up to the
'OFF' position allows 100% of the output to the brakes when the
manual control is actuated regardless of the output control setting.
2
1
1. Once the CURT quick connector or splice-in harness is installed,
determine a suitable mounting location for the module.
a. The module must be mounted securely to a solid surface
under the dash. The orientation of the module does not matter.
b. This module should be easy to access for troubleshooting.
It can be installed out of sight to reduce contact with operator.
MOUNTING THE MODULE
2. See the 'Set Manual Control Output and Brake Light Switches'
section in the previous section before mounting the module.
3. Secure the module in place using the
provided adhesive pad and zip-ties.
4. Plug in the module to the pigtail harness
or vehicle-specific quick plug. If harness is
unavailable, hard wiring will be necessary.
Figure 1

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The vehicle needs to be running or the
ignition in the 'ON' position with the vehicle in park.
At any moment during setup, if the LED on the Echo
under-dash is red, stop and refer to the 'Troubleshooting Guide'.
1. Enable Bluetooth in your mobile device settings.
This will allow you to detect your Echo®device.
NOTICE
Pairing of the app to the Echo device will
happen within the app. Device should not be paired
within the smartphone’s Bluetooth settings menu.
2.Open the app after installation and follow
the on screen prompts, agree to the end user
agreement and complete the initial registration
Once registration is created, you will
utilize the credentials for future logins.
3. Once registered and logged in, select 'Pair Device'
under the Echo®brake icon on the home screen.
4. Prior to scanning for an Echo®brake device, grant location
permissions to the app and enable device location.
5. The app will begin scanning for an Echo®device. Once the
'Echo®Brake Controller' is visible, select it. Once detected, select
'Connect' to pair the device. You will then be prompted to enter
the six-digit PIN, found on the side of the brake controller
unit or on the provided quick reference card. Once pairing is
complete, you will receive a pairing successful notification
and the LED light on the Echo®device will be solid blue.
INITIAL SETUP FOR BLUETOOTH CONNECTION
NOTICE
NOTICE
DOWNLOAD THE MOBILE APPLICATION
Mobile applications are available for Apple and Android OS. They can be accessed in the App Store
or Google Play by scanning the respective QR code below or searching for 'OneControl®Auto'.
• Apple OS Requires IOS 14 or higher
• Android OS requires Android 9.0 or higher
• Bluetooth must be enabled on your device for pairing to occur
• After the app is installed, follow the prompts for setup

PAGE 5 •51190-INS-RC •87 7.2 87.8 634 •NEED ASSISTANCE? •CURTMFG.COM
APPLICATION SETUP ADDING A PROFILE
ACTIVATING A PROFILE
MODIFYING OR DELETING A PROFILE
After pairing with the Echo®, you will be directed to the 'Controller
Profiles' to setup your trailer's profile. You can create and save
profiles for multiple vehicles, trailers and load conditions.
Note:
Setting configuration is required when trailer conditions change
or if the brake controller is being used for a different trailer / vehicle.
Controller Profile
• In this menu, you can access the five most recently used
settings. These settings are stored within the Echo®device.
This option allows you or others who borrow your Echo®
to access pre-configured tow settings quickly and easily.
• Your active profile will display in the
foreground within the active orange circle.
1. Select the '+' symbol in the orange controller profile menu.
2.Now you will be able to modify the
description of your vehicle and trailer.
3.Click ‘OK’ to confirm.
4. You are also able to modify an existing
trailer name by swiping left on the profile.
5. Repeat steps 1 – 3 for additional trailers.
1. You can switch between different profiles by swiping left or
right on the active controller profile on the home screen.
2.Once the chosen profile is set to active, select
‘Open’ under the connected Echo®device.
1. Select the profile you would like to delete by swiping left or right.
2.Select the pencil or 'edit' icon next to the
tow vehicle or trailer icons to enter settings.
3.If you would like to modify the profile, change the respective
tow vehicle name or trailer name and select ‘OK’.
4.If you would like to delete the profile,
select ‘Delete Profile’ and select ‘OK’.
Adding a Profile
Modifying / Deleting Profile
Activating a Profile
Settings

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CONFIGURING PROFILE SETTINGS
To enter 'Active Profile', tap the 'Open' button shown
under the image of Echo®. In your 'Active Profile' screen,
you can adjust settings and use the Echo®Brake controller.
1. Manual Brake Activation
2. Brake Output Indicator
Activate manual braking, press and hold the orange button.
Manual brake controller activation is used in situations where a slow
reduction in speed is desirable. As the manual control is activated,
the Echo®begins to apply the trailer brakes. Manual output can be
activated by pressing and holding the orange button in the app.
The orange outer ring indicates current brake output level.
The orange outer ring is a visual indicator of the current level
of power being applied to the trailer brakes. When the vehicle's
brakes are fully applied, the level of power and position
of the ring is determined by your max output setting.
3. Max Output
4. Sensitivity Level
5. Vehicle Hazard Lights
The maximum level of the brake controller.
The output control establishes the max amount of power available
to the trailer brakes when braking. The output should be adjusted
during initial setup, when trailer load changes, when different
trailers are used or when adjustment is needed for changing
road or driving conditions. To edit, tap the maximum output
button and increase or decrease using the '+' or '–' buttons.
The sensitivity of the braking power.
The sensitivity level adjusts trailer aggressiveness when
activated during braking. Sensitivity adjustment has no
effect on the manual brake control. The sensitivity can be
adjusted for individual driver preference, trailer load changes
or changing road conditions. To edit, tap the sensitivity
button and increase or decrease using the '+' or '–' buttons.
Turn on any time the vehicle's hazard lights are active.
When the vehicle's hazard lights are activated, the
trailer brakes may pulse on and off as the lights flash.
To prevent pulsing brake output, toggle the switch
ON any time the vehicle’s hazard lights are active.
1
2
3 4 5
Active Profile

PAGE 7 •51190-INS-RC •87 7.2 87.8 634 •NEED ASSISTANCE? •CURTMFG.COM
TEST DRIVE & ADJUSTMENT
Both the output and sensitivity can be adjusted to achieve
smooth, firm stops. Output and sensitivity adjustments
should only be made while stopped, with the transmission
in park or neutral, parking brake applied, foot off
the brake pedal, and no manual control actuation.
Perform tests and adjustments in a safe
environment (parking lot or in minimal traffic area).
Starting with the output adjustment, drive forward on a dry
and level paved or concrete surface. At approximately 25 mph,
apply the vehicle's brakes. If trailer braking is insufficient,
increase the max output setting in the OneControl®app. If the
trailer brakes lock up, decrease the max output. Repeat this
process until stops are firm, just short of lock up.
Once the output is set, adjust the sensitivity by driving forward
at approximately 25 mph and press the brake pedal. The vehicle
and trailer should make a smooth stop. If the stop seems slow
and more aggressive braking is desired, increase the sensitivity
level through the OneControl®app. If the stop seems too
aggressive, decrease the sensitivity level in the app.
Make several stops at various speeds and adjust the sensitivity
until stops are smooth and firm. Slight adjustment to the output
control may also be required to acheive desired results at all
test speeds. Note: If any problems occur during setup, refer
to the 'Troubleshooting Guide' on the last page of this manual.
This process must be repeated if there
are any changes to weather / road conditions or
significant changes in trailer weight or towing setup.
LED STATUS INDICATOR
A single LED on top of the Echo®shows the status of the
brake controller unit. Refer to the icons and descriptions below.
Device not paired,
trailer connected
(flashing green)
Device paired,
no trailer connected
(solid blue)
Device paired,
trailer connected
(solid green)
Device not paired,
no trailer connected
(flashing blue)
Hardware fault
(solid red)
No power
(no light on)
Wiring error
(flashing red)
Calibrating
Echo®
(flashing yellow)
Indicator Status
Flashing blue Device not paired, no trailer connected
Solid blue Device paired, no trailer connected
Flashing yellow Calibrating Echo
Flashing green Device not paired, trailer connected
Solid green Device paired, trailer connected
Flashing red Wiring error
Solid red Hardware fault

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TROUBLESHOOTING GUIDE
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Condition Problem Cause Possible Solution
LED does not light No power to brake controller,
no ground on vehicle 7-way
Check vehicle power and ground wiring
Trailer mode not activated for vehicle
Some vehicle's require a trailer to activate 7-way power. If a
trailer is not available, the CURT 7-way tester #58272 may
be used to complete setup / troubleshoot
Unable to connect to mobile devices No power to brake controller,
no ground on vehicle 7-way
Invalid Bluetooth PIN
Reset Bluetooth connection
Check Echo LED status for power
Input PIN from label or quick reference card. Enable Bluetooth
or grant permissions. Check smartphone compatibility
Select trailer profile, tap the Echo device name, then
tap the trash can icon to remove. In OS Settings, go
to Bluetooth connections and 'forget the device'
Solid red LED for more than 10 seconds Hardware fault Contact CURT Product Support
Flashing red LED Contamination in trailer plug socket Check for clean and dry trailer plug
Short in trailer brake wiring Locate and correct short
Accelerometer error Unplug the brake controller and plug it back in
Short or overload in trailer brakes Troubleshoot trailer brake circuit per
brake manufacturer's instructions
No trailer brakes, pedal or manual Mis-wired 7-way connector
Improper or corroded trailer wiring
Weak or missing ground
Confirm vehicle and trailer 7-way connections
No trailer brakes (pedal
or manual) and app signals 'disconnect'
Loss of trailer connection,
unplugged or bad wiring
Confirm vehicle and trailer 7-way connections
No response on manual
override or brake output
Mis-wired 7-way connector
Improper or corroded trailer wiring
No or intermittent power to controller
Weak or missing ground
Wireless connectivity error
Confirm vehicle and trailer 7-way connections
Check Bluetooth and application settings
Reduced braking power on
manual override or brake output
Weak or missing ground
Improper max power or sensitivity settings
Improper or corroded trailer wiring
Confirm vehicle and trailer 7-way connections
Check Bluetooth and application settings
Increase max power or sensitivity settings
Trailer brakes on all the time (LED is red) Mis-wired 7-way trailer connector Confirm vehicle and trailer 7-way connections
App signals 'low voltage' Low battery voltage Check vehicle battery and replace if needed
Confirm vehicle 7-way connections and wiring
App signals 'overload' Trailer brakes are overloaded Reconnect the trailer connector
Confirm vehicle 7-way connections and wiring
Check trailer brake wiring for short circuits
NOTICE
Screen If a communication error occurs between
the app and the brake controller, condition
notifications from controller will not be sent
The brake controller will continue to function
properly at the most recently programmed settings
and braking operation will not be affected