Lit. No. 27366, Rev. 01 February 15, 2008
74
TROUBLESHOOTING GUIDE
SOLENOID COIL ACTIVATION TEST (SCAT)
WARNING
Lower blade when vehicle is
parked. Temperature changes
could change hydraulic
pressure, causing the blade to
drop unexpectedly or damaging
hydraulic components. Failure
to do this could result in serious
personal injury.
NOTE: This V-plow diagnostic
harness kit can be used with or
without the snowplow connected
to a vehicle. Follow the
appropriate instructions for each
testing situation.
On-Truck Testing
Remove the vehicle ignition key and
put the vehicle in park or in gear to
prevent others from starting the
vehicle during testing.
1. Disconnect the snowplow and
vehicle battery cables, then
remove the hydraulic unit covers.
2. Remove the short red cable from
the motor relay.
3. Unplug the snowplow connectors
from Ports A and B of the Plow
Module.
4. Connect the diagnostic harness
connectors A and B to the
matching ports on the Plow
Module (A to A and B to B).
5. Plug the connectors removed from
the Plow Module into the matching
connectors on the diagnostic
harness (A to A and B to B).
6. Connect the snowplow control into
the 4-position control connector
either in the cab of the vehicle or
on the diagnostic harness.
7. Reconnect the snowplow and
vehicle battery cables.
NOTE: If you connect the control
inside the cab of the vehicle, the
engine does not need to be
running, but the vehicle ignition
key must be turned to the "ON"
position before proceeding. If you
connect the control to the
diagnostic harness, the key
should be left out of the ignition.
8. Turn the snowplow control ON
and perform a Solenoid Coil
Activation Test (SCAT). See the
chart below for solenoid numbers
and functions.
29290-1
Diagnostic
Harness
4-Position
Control
Connector
LED
Plow Module (on hydraulic unit)
NOTE: The green LED on the
diagnostic harness will illuminate
when the motor relay function is
activated. This light only tests the
Plow Module's motor relay output.
9. After completing the SCAT test,
turn the snowplow control and
the vehicle ignition OFF, then
disconnect the snowplow and
vehicle battery cables.
10. Perform any required repairs and
retest as needed. Always
disconnect the snowplow and
vehicle battery cables before
removing the diagnostic harness.
11. Reconnect the short red cable
assembly to the motor relay.
Solenoid Coil Activation
Test (SCAT) Chart
Control
Function
Component(s)
Activated
Raise S2, Motor Relay
Lower S3
Angle Right S5, S8, S10, Motor Relay
Angle Left S4, S6, S9, Motor Relay
Scoop S4, S7, S8, S11, Motor
Relay
Retract (Vee) S1, S4, S6, S8, S10,
Motor Relay
Wing (Right – Out) S8, S11, Motor Relay
Wing (Right – In) S1, S8, S10, Motor Relay
Wing (Left – Out) S4, S7, Motor Relay
Wing (Left – In) S1, S4, S6, Motor Relay
Excerpts taken from Diagnostic Harness Kit Installation Instructions (Lit. No. 29289, Rev. 03).
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