BENDIX BW2428 Manuel D’Utilisation

WARNING:  The ABS off-road mode should not be 

used on normal, paved road surfaces because vehicle 

stability and steerability may be affected.  When the ECU is 

placed in the ABS off-road mode, the ABS Indicator Lamp 

will flash constantly to notify the vehicle operator that the 

off-road mode is active.
Premium EC-60

™

 controllers use a dash-mounted switch 

to place the ECU into the ABS off-road mode.  In some 

cases, ECUs may also be put into the ABS off-road mode 

by one of the other vehicle control modules, using a J1939 

message to the EC-60

™

 controller.

(If you need to know if your EC-60

™

 controller uses a J1939 

message to operate the lamp, e-mail ABS@bendix.com, 

specifying the ECU part number, or call 1-800-AIR-BRAKE 

and speak to the Bendix TechTeam.)

The Premium EC-60

™

 controller monitors the vehicle stop 

lamp status.  Certain vehicle functions, such as ATC and 

All-Wheel Drive (AWD), use the status of the stop lamp to 

know the driver’s intention. This can be provided to the ECU 

via J1939 communications, or hardware input.

The Bendix

®

 M-32

™

 and M-32QR

™

 pressure modulator 

valves (PMV) are operated by the EC-60

™ 

controller to 

modify driver applied air pressure to the service brakes 

during ABS or ATC activation (See pages 6-8).  The PMV 

is an electro-pneumatic control valve and is the last valve 

that air passes through on its way to the brake chamber.  

The modulator hold and release solenoids are activated 

to precisely modify the brake pressure during an antilock 

braking event.  The hold solenoid is normally open and the 

release solenoid is normally closed.

Premium EC-60

™

 controllers will activate the TCV during 

differential braking ATC events.  The TCV may be a 

separate valve or integrated into the rear axle relay valve.

Cab and frame-mount EC-60

™

 controllers have internal 

circuitry to control the ABS Indicator Lamp on the dash 

panel.
The ABS Lamp Illuminates:

1.  During power up (e.g. when the vehicle is started) and 

turns off after the self test is completed, providing no 

Diagnostic Trouble Codes (DTCs) are present on the 

tractor.

2.  If the ECU is unplugged or has no power.
3.  When the ECU is placed into the ABS off-road mode 

(the lamp flashes rapidly).

4.  To display blink codes for diagnostic purposes after the 

external diagnostic switch is activated.

Certain models of the EC-60

™

 controller communicate with 

other vehicle control modules to operate the ABS Indicator 

Lamp using serial communications.  (If you need to know 

if your EC-60

™

 controller uses serial communications to 

operate the lamp, e-mail ABS@bendix.com, specifying the 

ECU part number, or call 1-800-AIR-BRAKE and speak to 

the Bendix TechTeam.)

As mentioned above, depending on the vehicle 

manufacturer, the dash indicator lamps (ABS, ATC, and 

trailer ABS) may be controlled using serial communications 

links.  In these cases, the EC-60

™

 controller will send a 

serial communications message over the J1939 or J1587 

links indicating the required status of the lamp(s).  Another 

vehicle control module receives the message and controls 

the indicator lamp(s).

The retarder relay disable output may be used to control 

a retarder disable relay.
When configured to use this output, the ECU will energize 

the retarder disable relay and inhibit the use of the retarder 

as needed.

A Controller Area Network (CAN) data link (SAE J1939) is 

provided for communication.  This link is used for various 

functions, such as: 
•  To disable retarding devices during ABS operation
•  To  request  that  the  torque  converter  disable  lock-up 

during ABS operation

•  To share information such as wheel speed and ECU 

status with other vehicle control modules

Premium EC-60

™

 controllers utilize the J1939 data link for 

ATC and drag torque control functions.

Certain models of the EC-60

™

 controller activate a trailer 

ABS Indicator Lamp (located on the dash panel) that 

indicates the status of the trailer ABS unit on one, or 

more trailers, or dollies.  Typically, the EC-60

™

 controller 

directly controls the trailer ABS Indicator Lamp based on 

the information it receives from the trailer ABS.