Section 7
Sensor Adjustment & Component Testing
Page 34
For ECU/Valve Assembly Part
Numbers 472 500 012 0 and
S 472 500 013 0 (Units with External
Diagnostic Connector)
If you are testing ECU Part Number 472 500 001 0,
contact WABCO North America Customer Care at
855-228-3203.
ABS Electrical/Hardware Installation Test
1. Provide 12 volts DC (9.5–14 volts is an
acceptable range) to the ECU/Valve Assembly.
Suggested power source: 12-volt battery.
2. Observe the ABS warning lamp and the blink
code lamp on the ECU. Check the results
in Ta b l e I .
Ta b l e I
If Status Action
Trailer ABS warning lamp does
not come ON.
Minimum power requirement
not met or wiring problem
exists.
Check electrical connections
and power source. Make
necessary repairs.
OR
Blink code lamp on ECU does not
come ON.
Trailer ABS warning lamp
comes ON.
Hardware fault code Identify fault location. Make
necessary repairs to the installation:
AND # Blinks Location
Blink code lamp on ECU
continues to flash.
3Sensor BU1
4Sensor YE1
5Sensor BU2
6Sensor YE2
7 External Modulator (Red)
4S/3M only
9 External Modulator (BU)
10 ECU Modulator (YE)
14 System Configuration or
Power Supply
15 ECU (contact WABCO)
Trailer ABS warning lamp comes
ON and stays ON.
Proper hardware installation. Perform Sensor Installation Test.
AND
ECU clicks twice.
AND
Blink code lamp on ECU comes
ON briefly then goes OFF or
flashes 14 times, then goes out.
Trailer ABS warning lamp
comes ON for 3 seconds, then
goes OFF.
Proper hardware installation.
Proper sensor installation.
None required.
AND
ECU clicks twice.
AND
Blink code lamp on ECU comes
ON briefly, then goes OFF.
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