Western Snowplows Midweight Series, Mechanic'S Manual

Page: 90 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
90
TROUBLESHOOTING
Off-Truck Testing
1. 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 on the diagnostic harness.
7. Connect a 12V power source to the snowplow
battery cable (POSITIVE [+] 12V to the red wire
and NEGATIVE [–] to the black wire). Turn ON
the power source.
8. Turn the snowplow control ON and perform a
Solenoid Coil Activation Test (SCAT). See the
table for solenoid numbers and functions.
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.
29290-1
Diagnostic
Harness
4-Position
Control
Connector
Plow Module (on hydraulic unit)
LED
9. After completing the SCAT test, turn the snowplow
control OFF and disconnect the power source.
10. Perform any required repairs and re-test 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)
Control Function Solenoid Coil(s) Activated
Raise S3, Motor Relay
Lower S1
Angle Right S2, Motor Relay
Angle Left S2, S3, Motor Relay
SOLENOID COIL ACTIVATION TEST (SCAT), continued