Control/Cable/Snowplow Module Test - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE
CONTROL/CABLE/PLOW MODULE TEST
CONDITION POSSIBLE CAUSE
Snowplow is not connected
Incomplete harness connection(s) or
damaged harness(es)
Control power
Single-pin connector on vehicle
light is not on.
snowplow lighting harness is not
connected
Harnesses connected to isolation
module incorrectly
Control fuse is blown
Control power Poor connection between control
light is blinking and module, damaged control, or
(slow fl ash). damaged plow module
Control power light
Snowplow is locked
is blinking (fast).
Harnesses connected to isolation
module incorrectly
Blown fuse or damaged plow module
Control power
light is on, but
snowplow does
Damaged harness(es) or cable(s)
not respond.
Damaged control or plow module
To Safely Handle PCB:
CAUTION
Circuit board may be
damaged by static electricity.
Always touch ground before
handling PC board.
Lit. No. 41467, Rev. 01
• Make sure grille plugs between snowplow and truck are properly connected.
• With the vehicle switched accessory ON, test the 4-pin connector inside the cab. If pin 1 does not have 12V
and/or if pin 4 does not have ground, use the electrical schematic in this guide to trace the wires from the
connector back to their source. Look for incomplete connections or damaged wires. Complete connections or
repair/replace damaged wires and harnesses as needed.
• Make sure single-pin connector on vehicle snowplow lighting harness is properly connected.
• Using the electrical schematic in this guide, verify that isolation module and harnesses are properly
connected.
• Replace all blown fuses in under-hood electrical harnesses.
• Make sure all plugs (control, between the snowplow and truck, on the snowplow, etc.) are properly connected.
• Check continuity of twisted pair wiring between control connector and plow module connector.
• If all plugs are properly connected, install a properly working control. If problem is corrected, replace PC
board and/or coiled cord in damaged control.
• If problem is not corrected with properly working control, replace plow module.
• Enter 4-digit security code to unlock snowplow.
• Using the electrical schematic in this guide, verify that isolation module harnesses are properly connected.
• Replace all blown fuses on truck and snowplow.
• If fuses are all okay, check for 12V at all coils and primary terminal of motor relay. If 12V is missing from any coil or
relay, replace plow module. If 12V is present, go to next possible cause.
• Perform a Solenoid Coil Activation Test (SCAT) according to the instructions in this guide. Replace/repair any
damaged harnesses and cables.
• Install a properly working control. If problem is corrected, replace PC board and/or coiled cord in damaged
control.
• If problem is not corrected with properly working control, replace plow module.
Before disassembling control and
touching the PC board, be sure
to remove any static charge from
yourself. Static charge can build
up as a technician works on the
control. Best practice is to work at a
properly grounded work station with
CORRECTIVE ACTION
a grounded wrist strap attached to
the technician. In place of proper
work station, the technician should
work in an oil- and solvent-free area
and touch a good ground each time
before touching the PC board while
servicing the unit.
Handle the PC board by the edges
only.
Do not touch the carbon (black)
areas of the keypad. Skin oils will
deteriorate the contact area.
April 15, 2021
69