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40
MBS-2 Installation
5. The following troubleshooting scheme should only be performed after all
the above troubleshooting steps have been completed. If in a rare case
an in-axle sensor harness is defective, with the speed signal and ground
leads crossed, the MBS-2 will not see this as a fault until the trailer is
moving. Once moving, the system turns on the warning lamp as it is
receiving an inadequate signal from the wheel with the defective harness.
IMPORTANT: When performing the troubleshooting step below
spin the wheels in a slow, deliberate manner.
To troubleshoot this type of problem, power the auxiliary circuit and check for
12 VDC on pin two of the 4-pin Deutsch connector on the accessory cable.
(See figure 29 on Page 46 “MBS-2 Electrical Schematic”) Voltage should be
present at power up. Locate the wheels on the front axle of a four-sensor
system or the sensed wheels of a two-sensor system. Spin the wheels in
opposite directions, one forward and the other in the reverse direction, for ten
seconds. The power on pin two of the accessory cable should drop to zero. If
it does not the wheel that was spun in the reverse direction has a defective
harness. If power does drop to zero spin the wheels forward to reestablish
power on pin two. Spin the wheels in the opposite direction again, only spin
the wheel that was spinning in the reverse direction before in the forward
direction and spin the wheel that was spinning in the forward direction before
in the reverse direction for ten seconds. As before if the power does not drop
to zero then the wheel spinning in the reverse direction has the defective
harness. If the power still drops to zero after both above cases have been
performed then the problem exists in the backup harness, not the in-axle
harnesses.
Figure 25, Backup Light Decal
THIS TRAILER IS EQUIPPED
WITH A REVERSE
DETECTION SYSTEM.
BACKUP LIGHTS AND/OR
ALARM WILL ACTIVATE
WHEN VEHICLE IS MOVING
IN REVERSE.
DECAL PART NUMBER: WNC#25000984
NOTICE
281UX007
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