(01/02)
KM816010
Page 33 of 44
MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
E. Headlight Flash Does Not Work
E1. Symptom: Headlights will not turn on
E1-4. Possible cause: Bad headlamps relay in power distribution box.
E1-5. Possible cause: Bad electronics module.
Check
Result
What To Do Next
E 1 -4A
Turn on ignition. Turn on headlights
with dash switch. Press headlight
flash button on steering wheel.
Listen for relay click in power distri-
bution box.
Click heard.
Remove headlamp relay. Use
jumper wire from terminal
to terminal directly across from it
(not S terminal) (common to nor-
mally open). Headlights should
come on.
If headlights work, replace relay.
If headlights do not work, the prob-
lem exists in truck wiring.
No click heard.
Go to
E1-5
.
Check
Result
What To Do Next
E 1 -5A
Turn off ignition. Unplug 8-way con-
nector from electronics module.
Check for continuity between pins 4
& 6 on module connector.
Continuity from pin 4 to 6.
Problem may be in wiring.
Check headlamp circuits again. Go
to
A3
.
No continuity.
Replace electronics module.
