Entering The Flash Code Diagnostic Mode; Suitable Light Tester - WABASH COMMUNICATIONS MBS-1P Installation Manual

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Entering the flash code diagnostic mode

Fault identification is provided via flashes of the ABS malfunction lamp.
To enter the flash code diagnostic mode, it must be possible to power the
auxiliary circuit. On March 1997 and newer tractors, this circuit is switched
with the ignition. Alternately, a suitable light tester may be used.

Suitable Light Tester

When using a light tester to power any ABS system, supply power directly
from a battery, not a charger. The charger may remain connected to the
battery to keep the battery charged, but the charger can not be used as the
power source. See Figure 17.
Faults are categorized in two types:
Both, stored faults and current faults can be identified using the ABS flash
code system.
Battery
Charger
Figure 17, Typical Trailer Light Test Unit Suitable for Use with ABS
• Current Faults – Faults that are active when the system is powered up,
causing the malfunction lamp to remain illuminated. All current faults
become stored faults after they are repaired.
• Stored Faults – Faults that were current faults at one time, but are no
longer active and allow the malfunction lamp to go OFF at power up.
Typically they may be caused by intermittent problems that only occur
when the vehicle is moving.
12V Switch
Battery Panel
+ +
-
-
J560 Trailer Connector
7. Blu (Continuous ABS Power)
6. Brn (Tail and license plate lamps)
5. Grn (Right Turn Signal)
4. Red (Stop Lamps/ABS)
3. Yel (Left Turn Signal)
2. Blk (Clearance, Side Marker & Ident Lamps)
1. Wht (Ground Return to Towing Vehicle)
MBS-1P Installation
322UX043
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