BENDIX TCH-013-022 Fascicule

Bulletin No: TCH-013-022

Effective Date: 11/2/2012

Cancels: N/A

Page: 2 of 2

FIGURE 4 - RELAY SWITCH WIRING DIAGRAM

Step Two: Enable Retarder
2. Make the connections to the vehicle per the wiring

diagram - See Figure 3. To allow the ECU to continue
to disable the retarder, add one 18-gauge twisted
pair of wires on the 30-pin connector. Connect pin
K1 (Retarder Relay). Connect the relay to power and
the retarder connection of the ECU.

3. Additionally, the ECU will need to be reconfigured to

only expect a retarder relay using a self-configuration
that can be performed by a diagnostic tool such as
Bendix

ACom

Diagnostics or a Bendix

RDU

™

unit.

4. The ECU will now be configured for ABS only, with

retarder control supplied via the retarder relay.

Note: ATC has been disabled. The ATC dash lamp
will NOT illuminate at any time (including during
the vehicle start-up bulb check).

5. Verify proper configuration using the LEDs on the

ECU or by using a diagnostic tool.

Note: This hard-wire procedure only provides

retarder control.

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND

FOLLOW THESE INSTRUCTIONS TO AVOID
PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following general
precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the parking brakes,

and always block the wheels. Always wear safety glasses.

2. Stop the engine and remove ignition key when working under or

around the vehicle. When working in the engine compartment,
the engine should be shut off and the ignition key should be
removed. Where circumstances require that the engine be in
operation, EXTREME CAUTION should be used to prevent
personal injury resulting from contact with moving, rotating,
leaking, heated or electrically charged components.

3. Do not attempt to install, remove, disassemble or assemble

a component until you have read and thoroughly understand
the recommended procedures. Use only the proper tools and
observe all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle’s air brake system,

or any auxiliary pressurized air systems, make certain to drain
the air pressure from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with a Bendix

AD-IS

air dryer system or a dryer reservoir module, be sure to drain
the purge reservoir.

Following the vehicle manufacturer’s recommended procedures,
deactivate the electrical system in a manner that safely removes
all electrical power from the vehicle.

6. Never exceed manufacturer’s recommended pressures.

Never connect or disconnect a hose or line containing pressure;
it may whip. Never remove a component or plug unless you are
certain all system pressure has been depleted.

Use only genuine Bendix

brand replacement parts, components

and kits. Replacement hardware, tubing, hose, fittings, etc. must
be of equivalent size, type and strength as original equipment
and be designed specifically for such applications and systems.

9. Components with stripped threads or damaged parts should be

replaced rather than repaired. Do not attempt repairs requiring
machining or welding unless specifically stated and approved
by the vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make certain all

components and systems are restored to their proper operating
condition.

11. For vehicles with Automatic Traction Control (ATC), the ATC

function must be disabled (ATC indicator lamp should be ON)
prior to performing any vehicle maintenance where one or more
wheels on a drive axle are lifted off the ground and moving.

Bendix Technical Assistance Team

For direct telephone technical support, call the Bendix Tech
Team at 1-800-AIR-BRAKE (1-800-247-2725), option 2, then
option 1. Representative are available Monday through
Thursday, 8:00 A.M. to 6:00 P.M., Friday, 8:00 A.M. to
5:00 P.M., ET. Or, if you prefer, e-mail the Tech Team at

techteam@bendix.com

Please have the following information available: Bendix product

model number, part number and configuration, vehicle make and

model, vehicle configuration (e.g. number of axles, tire size).
Reference: The full Service Data sheet for the Bendix

EC-30

™

ABS/ATC Controller is SD-13-4815 (BW1794) and is available
for download on www.bendix.com. You can also order copies
from the online Bendix Literature Center.