13
Introduction
9. Perform one of the following depending on the trailer you are servicing.
A. For Trailers with Both Manual and Automatic Lift Axle Override.
Connect the override switch cable, P/N 449 826 XXX 0 to the GIO hub cable port 1 of the GIO hub
cable connected to the ECU GIO 1 port. Then connect the single wire leg of the lift axle "Y" cable,
P/N 894 601 100 0 to the other end of the override switch cable. This "Y" cable splits the override
switch cable into two leads. Then the next step is to plug the manual override cable, P/N 449 428
XXX 0 into either one of the other legs of the "Y" cable. The other end of the manual override switch
cable must be connected to a single-pole, single-throw, weatherproof toggle switch that is mounted
on the trailer in a driver-accessible location.
To wire the switch connect the blue wire of the cable to one side of the toggle switch and the brown
wire to the other side of the switch. The yellow/green wire is not used and must be capped or termi-
nated to prevent any corrosion. This switch overrides the settings that govern the raise/lower feature
and keeps they lift axle in the lowered position as long as the switch is activated.
Then to install the automatic override portion of the system, connect the other end of the "Y" cable to
the pressure switch, P/N 431 700 002 0.
Then pressure switch, P/N 431 700 002 0 must be connected between the delivery port of the
parking (spring) brake valve and the parking (spring) brake chamber using a tee in the delivery line.
When supply air is removed from the trailer, the pressure switch overrides the settings that control
raise/lower feature and keeps the lift axle in the lowered position as long as the parking (spring)
brakes are set. This is achieved by pulling the red dash valve in the towing vehicle to remove supply
air from the trailer.
B. For Trailers with Automatic Lift Axle Override.
Connect the override switch cable, P/N 449 826 XXX 0 to the GIO hub cable port 1 of the GIO hub
cable connected to the ECU GIO 1 port. Then connect the other end of the override switch cable to
the pressure switch, P/N 431 700 002 0.
Then pressure switch, P/N 431 700 002 0 must be connected between the delivery port of the
parking (spring) brake valve and the parking (spring) brake chamber using a tee in the delivery line.
When supply air is removed from the trailer, the pressure switch overrides the settings that control
raise/lower feature and keeps the lift axle in the lowered position as long as the parking (spring)
brakes are set. This is achieved by pulling the red dash valve in the towing vehicle to remove supply
air from the trailer.
C. For Trailers with Manual Lift Axle Override.
Connect the manual override switch cable, P/N 449 827 XXX 0 to the GIO hub cable port 1 of the
GIO hub cable connected to the ECU GIO 1 port. The other end of the manual override switch cable
must be connected to a single-pole, single-throw, weatherproof toggle switch that is mounted on the
trailer in a driver-accessible location.
This switch is not provided by WABCO. Ensure that the "on" and "off " positions are clearly
labeled.
To wire the switch, connect the green wire of the cable to one side of the toggle switch and the
brown wire to the other side of the switch. The red wire and yellow wires are not used and must be
capped or terminated to prevent any corrosion. This switch overrides the settings that govern the
raise/lower feature and keeps they lift axle in the lowered position as long as the switch is activated.
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