Section 8
Appendixes
Page 42
Appendix C
Warning Lamp Diagnostics
ECU Part Numbers 472 500 011 0, 472 500 012 0,
and 472 500 013 0
If you do not have easy access to either the
diagnostic tool or blink code lamp on the ECU, the
ABS warning lamp on the trailer may be used to
display blink codes.
The lamp is capable of displaying faults in Normal,
Expert, Clear-All, and Sensor Installation
Tes t m ode s.
System requirements:
앫 Trailer with mandated ABS (with ECU/Valve
Assembly part number listed above).
앫 Tractor/trailer hook-up with switched ignition
power on tractor/trailer connector or a
DC-powered tester.
앫 Technician and assistant recommended.
Read the description of each mode and use the
blink code tables for Normal, Expert, and
Reconfigure/Clear-All modes that appear in
this manual.
To display the blink codes on the ABS
warning lamp:
1. Make sure the vehicle is stationary and that the
trailer is hooked to a properly equipped tractor
(see system requirements).
2. Remove power from the tractor and trailer
(Turn off ignition).
3. Step on the brake pedal. Foot must remain on
the brake for the entire procedure.
4. Provide Power. Turn on ignition for desired
mode (Normal, Expert, or Clear-All). Once you
enter the mode you plan to use, follow the
instructions for that mode.
Reminder:
Brakes must be applied (foot on brake pedal)
for the entire procedure.
NOTE
To exit any mode, release foot brake pedal and
turn ignition off for AT LEAST 10 SECONDS.
For Normal Mode:
앫 Turn ignition ON ONCE for ONE SECOND.
앫 Turn ignition OFF for ONE SECOND.
앫 Turn ignition back ON.
– Warning lamp will display the blink code one
time. See Table E — Normal Mode Fault Code
Ta b l e , in Section 5, "Diagnostics", for blink
code identification.
For Expert Mode:
앫 Turn ignition ON ONCE for ONE SECOND.
앫 Turn ignition OFF for ONE SECOND.
앫 Turn ignition ON A SECOND TIME for
ONE SECOND.
앫 Turn ignition OFF for ONE SECOND.
앫 Turn ignition back ON.
– Warning lamp will display the blink code one
time. See Table J — Expert Mode Fault Code,
in “Appendixes”, for blink code identification.
For Clear-All or Sensor Installation
Te s t M o d e :
앫 Turn ignition ON ONCE for ONE SECOND.
앫 Turn ignition OFF for ONE SECOND.
앫 Turn ignition ON A SECOND TIME for
ONE SECOND.
앫 Turn ignition OFF.
앫 Turn ignition ON A THIRD TIME for
ONE SECOND.
앫 Turn ignition OFF for ONE SECOND.
앫 Turn ignition back ON.
– The blink code lamp will flash rapidly eight
times to indicate that stored faults have been
cleared from ECU memory.
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