5
STATUS LIGHTS
ECU
Detected
(Yellow)
Blinking Determining if ECU is present
Steady
ECU detected
Dynamic load is active
Not illuminated
No ECU detected
Static load is available
Power
(Red)
Intermittent blink
Indicates search signal from vehicle
This is typical and expected from
vehicles with an established ECU
connection
Steady
Electric Brake circuit has power and
continuity
Not illuminated No power or continuity detected
ECU and
Power
Light
Blinking
Fault in wiring—check connections
and trouble codes
Gain 1-10
(Blue)
Illuminated
Indicates gain from truck
1.0-1.5V increments
ECU DETECTION LIGHT
The ECU Detected light indicates when the Electric Brake Force Meter
detects a discovery pulse signal from the vehicle being tested. Modern
vehicles with integrated controllers, as well as some aftermarket controllers,
limit output to the Trailer Electric Brake circuit (blue wire) until they determine
a trailer is connected. The way they determine this is by sending out a
small amount of power and monitoring the load. The Electric Brake Force
Meter looks for this trailer discovery pulse, and when it detects the pulse,
commands the ECU Detected light to illuminate. Once the Electric Brake
Force Meter determines the presence of the discovery pulse, it adjusts its
built-in trailer simulation load accordingly.
If the ECU Detected light does not illuminate even though the vehicle is
equipped with a modern brake controller, this indicates a faulty brake control
module or relay, poor wire connection, or a blown fuse in the vehicle.
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