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KM816010
Page 11 of 44
MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
B. Horn Does Not Work
NOTE: Use this section only if horn does not work. If none of the SmartWheel functions work, go to Section A.
B1. Possible cause: No power or ground in horn circuit.
B2. Possible cause: Bad horn relay in power distribution box.
Check
Result
What To Do Next
B1 -1
Horn circuit breaker or fuse in cab
power distribution box.
Circuit breaker or fuse OK.
No continuity.
Go to
B1-2
.
Determine cause for fuse to blow
(shorted wire, etc.). Replace circuit
breaker or fuse. If horn still does not
work, go to
B1-2
.
B1 -2
Horn wiring/ connections leading to
horn (ckt C53HN). Use multiplex
steering wheel horn wiring diagram
R115-5453.
Wires OK, connectors clean and
tight.
Go to
B2
.
Wires broken, frayed, or connectors
loose, damaged, corroded.
Repair or replace wires and/or con-
nectors.
Check
Result
What To Do Next
B2-1
Press horn button on steering wheel.
Listen for relay click in power distri-
bution box.
Click heard.
Remove horn relay. Use jumper wire
from terminal to terminal
directly across from it. Horn should
come on. If horn works, replace
relay. If horn does not work, it may
be defective or problem exists in
truck wiring. Troubleshoot ckt
C53HN.
No click heard.
Go to
B3
.
