Lit. No. 41298, Rev. 01 February 15, 2019
61
7. Turn the snowplow control ON and perform
a SCAT. See the following chart for solenoid
numbers and functions. See the beginning of
this section for instructions on performing a
SCAT.
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. Refer
to Motor and Motor Relay Test section for
instructions on properly testing a motor relay.
8. After completing the SCAT, turn the snowplow
control and the vehicle ignition OFF, then
disconnect the snowplow and vehicle battery
cables.
9. Perform any required repairs and retest
as needed. Make sure to disconnect the
snowplow and vehicle battery cables before
removing the diagnostic harness.
NOTE: This MUX-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. Unplug the snowplow connectors from ports A
and B of the Plow Module.
3. Connect the diagnostic harness connectors
A and B to the matching ports on the Plow
Module (A to A and B to B).
4. Plug the connectors removed from the Plow
Module into the matching connectors on the
diagnostic harness (A to A and
B to B).
TROUBLESHOOTING
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.
5. Connect the snowplow control into the 4-position
control connector either in the cab of the vehicle
or on the diagnostic harness.
6. 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.
29290-1
Diagnostic
Harness
4-Position
Control
Connector
Plow Module (on hydraulic unit)
Plug
LED
Solenoid Coil Activation
Test (SCAT) Chart
Control
Function
Component(s)
Activated
Raise S3 Motor Relay
Lower S1
Angle Right S2, Motor Relay
Angle Left S2, S3, Motor Relay
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