5. COMPONENTS

Installations of the TABS‑6 Adv MC module use the

following components:

Internal:

• Electronic Control Unit (ECU): TheECUmonitors

the speed sensor signals, lateral accelerometer sensor

signalandvariouspressuresensors(andifcongured,

externalspringdeectionsensor)todeterminewhen

ABS and/or TRSP intervention is required.  When

needed, the ECU actuates the appropriate pressure

modulator valves to optimize the brake pressure. The

ECUmonitorsthesystemtodetectandwarnthedriver

ofanymalfunctions.DiagnosticTroubleCodes(DTCs)

arestoredintheECUandcanbereviewedtodiagnose

the TABS‑6 Adv MC module system.

• Lateral Accelerometer Sensor: The lateral accel‑

erometer sensor senses the lateral movement of the

trailer and sends an electrical signal directly propor‑

tionaltothetrailer’slateralaccelerationtotheECU.

• Supply Pressure Sensor: (non‑serviceable, and

located within the module.)

• Internal Load Sensor:

For air suspension systems, the load sensor port (P42)

mustbeplumbedtoaxedaxleairridebellows.Note:

the sensor must not be plumbed to a lift axle bellows

since they are not charged when the axle is not

being used. The function of this sensor is to monitor

the pressure and send an electrical signal directly

proportionaltothetrailer’saxleloadtotheECU.

• Brake Demand Pressure Sensor: This sensor

monitors the trailer service brake pressure being

applied by the driver and sends an electrical signal

directly proportional to the driver’s brake demand to

theECU.

• Brake Delivery Pressure Sensors: These sensors

(P21,P22)monitorthetrailerservicebrakepressure

that is being delivered to the wheel ends through, or

by, the TABS‑6 Adv MC module system and sends

electrical signals directly proportional to the delivered

trailerservicebrakepressuretotheECU.

• Modulator Relay Valve (MRV): MRVs are integrated

into the module and are controlled electrically by the

ECUtodecrease,hold,orallowthefullappliedbrake

pressure into the brake chamber to control the braking

torqueatthewheels.

External:

• Wheel Speed Sensors (WSS):Locatedatselected

hubs, wheel speed sensors detect the rotation of indi‑

vidualwheelsandsendanelectricalsignaltotheECU

proportional to the rotational velocity. See Figure 3.

• External Load Sensor:

For spring suspension systems, an external electrical

springdeectionsensorisinstalled—typicallyasclose

to the center (±5 inches) as possible of an axle with

linkage attached to the center of the axle (but MUST

NOT be installed on a lift axle), See Figure 4. Vehicles

with a mechanical load sensor have the port (P42) used

for sensing the air suspension system plugged.

Note: Do Not Use

Previous WSS

Clamping Sleeves

That Have “BW”

in a Diamond

90° Speed

Sensors

Straight Speed

Sensors

Sensor

Clamping

Sleeve

Acceptable

Logo-Stamped

Sleeves

FIGURE 3 ‑ BENDIX

WS-24

™

WHEEL SPEED SENSORS

Load Sensor

Vertical Linkage Rod

Axle Attachment

Bracket

Axle Strap-Style

Fastener Clamp

Mounting

Bolts

Rubber

Link and

Rod

Adjustable Linkage

with Rubber Link

FIGURE 4

‑ TYPICAL

EXTERNAL

LOAD SENSOR

INSTALL ATION

• Trailer ABS Indicator Lamp: ControlledbytheECU

to show the ABS status, the trailer ABS indicator lamp

illuminateswhenaDiagnosticTroubleCode(DTC)is

active. See Figure 5. If there are no ABS diagnostic

trouble codes present, when ignition power is applied

totheECU,thelampwillilluminateasabulbcheck

lasting typically two (2), up to six (6) seconds at most.

FIGURE 5 ‑ TRAILER-MOUNTED ABS INDICATOR LAMP

1 2 3 4 5 6 7 8 9 10 ... 39 40

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BENDIX BW2726 User Manual Page 5

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