Curt Manufacturing DISCOVERY User manual

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For use with 12 volt negative ground systems only
For trailers with two to eight brakes
Read, follow and save this guide for future reference
DISCOVERY
DISCOVERY BRAKE CONTROL
INSTALLATION AND USER GUIDE
51120-INS-R1 •

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This package includes:
(1) Brake control module with quick plug
(1) Mounting bracket
(4) Mounting bracket screws
One or more of the following may be needed to complete installation:
•Brake control connection harness, supplied with the tow vehicle (if equipped)
•CURT quick plug - custom connector for specic vehicles. See catalog for availability
•CURT part# 51515 - male quick plug with pigtails
•CURT part# 51500 - brake control wiring kit
Key Features
•Display shows provides detailed brake force output
•Mount anywhere in your vehicle
(Dependable solid state electronics require no leveling)
•Electronic activation ensures smooth stops
•No internal moving parts
•Fully-adjustable power and time (sync)
•Provides automatic and manual trailer braking
•Manual control lever activates brake lights
•Compatible with electronic systems (anti-lock brakes and cruise control)
•Self diagnostic - continually monitors trailer connection and checks for short circuits

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Controls and Components
1. Display
2. Sync adjustment
3. Output adjustment thumb wheel
4. Manual control lever
5. Quick plug connector
3
2
4
1
5

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Output Control
The output control establishes the maximum
amount of power available to the trailer brakes.
As the output control is moved to the right, more power will be available
to the brakes when the brake pedal is pressed or the manual control is used.
The output control should be adjusted during initial setup, when trailer load
changes, when different trailers are used or to adjust for a change in road conditions.
The output setting is shown on the digital display when a trailer is connected and
the brake pedal is pressed or the when manual control lever is actuated. The output
setting is shown as 0 through 10, with 0 being the minimum and 10 the maximum.
Sync Control
The sync control is located on the right side of the brake control unit and is responsible
for adjusting trailer brake aggressiveness. The trailer brakes become more aggressive
as the switch is moved toward the rear of the tow vehicle.
To view the sync setting on the display, press the brake pedal (trailer must be connected)
and move the sync control slightly. The display will change to the sync mode.
The sync setting is shown as 1 through 9, with 1 being the least aggressive and 9 being
the most aggressive. The sync adjustment has no effect on the manual control. The sync
control should be adjusted for individual driver preference or changing road conditions.

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Manual Control
The manual control lever is located on the front left of the brake control unit.
It only applies to the trailer brakes. Manual control is used during initial setup and
in situations where a slow reduction in speed is desirable.
When the manual control is pushed to the right, the control begins to apply
the trailer brakes. The further to the right it is pushed the harder the brakes
are applied until the maximum set by the output control is reached.
The output setting will be shown on the display and can be adjusted when using the
manual control. The manual control activates the tow vehicle and trailer stoplights.
Digital Display
The digital display shows the output
setting when the control is activated.
It is used to setup and monitor the
brake control and can be used when
trouble shooting.
Control activated
No trailer connected
Brake pedal pushed
Sync control activated
Trailer connected
Short or overloaded brake circuit
See trouble shooting guide
Internal control error
See trouble shooting guide
Control activated
Trailer connected