Headlamp Troubleshooting; Vehicle Headlamps - Western HTS Mechanic's Manual

TROUBLESHOOTING GUIDE

VEHICLE HEADLAMPS

Incorrect Operation or No Headlamps
BASIC CHECK QUESTIONS
1 DRL mode/automatic headlamp function
2 Correct isolation module kit installed for application
3 OEM lights operating correctly prior to installation
4 OEM fuse tests good
5 OEM headlamp bulb operational
6 Plugged into OEM headlamp correctly
Harnesses in correct location at isolation module and installed per
7
installation instructions
8 Harnesses confi gured correctly for HB-1/HB-5 and/or kits using adapters Install using isolation module instructions.
Confi guration plug correct
9
(only required on certain 4-port module installations)
10 Correct harnesses and/or isolation module in kit
11 Harness wired per drawing
12 Verify power and ground in proper pin locations at isolation module
13 Verify power and ground in proper pin locations to vehicle headlamp
14 Test isolation module with isolation module tester
Lit. No. 41467, Rev. 01
SOLUTIONS
Fully understand OEM headlamp operation; refer to vehicle owner's manual.
Verify per Quick Match at www.westernplows.com.
OEM headlamps must be fully operational for correct isolation module operation.
Replace with proper fuse.
Replace with proper bulb.
Connect per isolation module instructions.
Install using isolation module instructions.
Refer to isolation module instructions.
Refer to isolation module parts list.
See electrical schematics in this guide.
See electrical schematics in this guide.
See electrical schematics in this guide.
Test using instructions supplied with tester.
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April 15, 2021