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MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
Troubleshooting Charts
A. Start - No Functions Work or Operation is Intermittent
A1. Possible cause: Open circuit in BA11 or Gnd circuit to elect. module (circuits PCB 1, 2, 3,
or 4 and G N D).
Check
Result
What To Do Next
A1-1
Unplug the 6-way connector from
the multiplex electronics module.
Check voltage between pin 6 and
pin 3.
Voltmeter reads battery voltage.
No voltage.
Go to
A1-2
.
Go to
A1-3
.
A1-2
Check connector pins to make sure
they are not corroded, bent, or
unseated.
Connector pins OK.
Connector pins bad.
Go to
A1-4
.
Repair or replace connector/ pins. If
problem is corrosion, eliminate
source of moisture.
A1-3
Check circuit breaker or fuse in
power distribution box position
Spare 1,2,3, or 4.
Circuit breaker good.
There is a broken wire or connector
in the harness or in the power distri-
bution box. Look at the multiplex
steering wheel headlamp wiring dia-
gram and trouble-shoot circuit PCB
1,2,3, or 4 and GND.
Circuit breaker bad.
Replace circuit breaker.
A1-4
Visually check the 2-way connector
just behind the steering column in
the dash (twisted pair circuit from
steering wheel).
Connector OK.
Connector unplugged, broken, cor-
roded.
Go to
A2
.
Repair/Replace connector. If prob-
lem is corrosion, eliminate source of
moisture.
