BENDIX TABS-6 TRAILER ABS MODULE, Service Data

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changes. (The default setting expects a 100-tooth tone ring
to be used.) Vehicle axle and ABS control configurations
determine if two or four wheel speed sensors are required.
See page 19 for electrical system schematics showing
wheel speed sensor connector pin locations.
A proper sensor installation is critical to correct ABS
operation.
Typically, the WS-24
™
sensor is installed in mounting blocks
that are welded to the axle housing. WS-24
™
wheel speed
sensors are protected by a stainless steel sheath. They
are designed to be used with beryllium copper clamping
sleeves (sometimes referred to as a “retainer bushing”,
“friction sleeve” or “clip”)
(See Figure 6). The clamping
sleeve provides a friction fit between the mounting block
bore and the WS-24 ™ sensor.
90° Speed
Sensors
Straight Speed
Sensors
Sensor
Clamping
Sleeve
Logo Stamped
into Sleeve
FIGURE 6 - BEndIx
®
WS-24
™
WHEEL SPEEd SEnSORS
1. For increased corrosion protection we recommend
that a high-temperature rated silicon- or lithium-based
grease be applied to the interior of the mounting block,
the sensor, and to a new clamping sleeve.
2. Install the new clamping sleeve fully into the block,
with the retaining tabs toward the inside of the vehicle.
Please note that WS-24
™
wheel speed sensors must
use the correct clamping sleeve to avoid problems
associated with reduced retention force, such as sensor
movement and resulting ABS trouble codes.
Use of cable ties/tie wraps to attach wheel speed
sensor leads to rubber hoses/jounce lines is not
approved. The hose may expand during braking
due to air pressure and the cable tie may not, so the
conductor material/insulation of the speed sensor
extensions may be damaged. Bendix instead
recommends only open-ended clips be used to hold
sensor leads to jounce lines.
3. Gently push (DO NOT STRIKE) the sensor into the
mounting block hole until it bottoms out on the face of
the tone ring. Secure the cable lead wire to the knuckle/
axle housing three to six (3-6) inches from the sensor.
See Figure 7.
Circuit
7-Pin
Trailer
Conn.
5-Pin
ABS
Conn.
5-Pin
ECU
Conn.
18-Pin
ECU
Conn.
Ignition Power
PLC
(Blue Wire)
7 B B 6
Brake Light
Power
(Red Wire)
4 A A 12
Ground
(White Wire)
1 E E 18
Indicator Lamp
(White/Green
Wire)
N/A D D 5
CHART 2 – POWER And GROUnd
FIGURE 5 - TRAILER-mOUnTEd ABS IndICATOR LAmP
ABS INDICATOR LAMP
Trailer-mounted Lamp
The Bendix ® TABS-6 ™ module controls an ABS indicator
lamp to show the trailer ABS status. With power supplied by
the towing vehicle, the module illuminates the ABS indicator
lamp by providing a 12.0 VDC signal. (The other side of
the lamp is grounded.) The ABS indicator lamp output uses
Pin D of the five (5)-pin Standard module connector, and
Pin 5 of the 18-pin Premium module connector.
Dash-mounted Lamp (PLC Controlled)
Bendix TABS-6 modules use SAE J2497 standards to
support Power Line Carrier (PLC) communication. The
Bendix TABS-6 module transmits a signal over the power
line to the towing vehicle. This information is used by
towing vehicle’s ABS controller to know when to illuminate
the trailer ABS indicator lamp mounted on the dash.
The status of the trailer ABS is transmitted over the ignition
power wire (blue wire of the J560 connector), Pin B of the
five (5)-pin Standard module connector, or Pin 6 of the
18-pin Premium module connector.
BENDIx
®
WS-24
™
WHEEL SPEED SENSORS
Wheel speed data is provided to the Bendix TABS-6 module
from the WS-24
™ wheel speed sensors (see Figure 6) .
Vehicles have an exciter ring (or “tone ring”) as part of the
wheel assembly, and as the wheel turns, the teeth of the
exciter ring pass the wheel speed sensor, generating an AC
signal. The Bendix TABS-6 module receives the AC signal,
which varies in voltage and frequency as the wheel speed