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KM816010
Page 7 of 44
MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
A. Start - No Functions Work Or Operation is Intermittent
A2. Possible cause: Bad electrical connection to hub or slip rings.
Check
Result
What To Do Next
A2-1
Remove 4 screws holding hub to
steering wheel and check wire con-
nections to hub.
Wires/connections OK.
Wires or connectors disconnected,
broken, corroded.
Go to
A2-2
.
Repair/replace terminals or wires.
Be careful to observe polarity on
wires.
A2-2
Check continuity of ckts IPX SIG and
IPX GND through brushes and slip
rings (yellow and brown wires). Mea-
sure from hub to 2 way metri-pack
connector at base of steering col-
umn and from 2 way connector to 6
way connector (pins 1 and 2) at mul-
tiplex module. Also check polarity of
circuits. If reversed, no functions will
work and module may be damaged.
Each circuit has continuity.
No continuity in one or both circuits.
Continuity is intermittent in one or
both circuits as steering wheel is
turned.
Go to
A3-1.
Go to
A2-3
.
Go to
A2-4
.
A2-3
Extend steering column to full tele-
scoped position. Remove side cov-
ers from steering column and
inspect slip rings, brushes & contact
springs. Turn steering wheel while
observing brush and slip ring opera-
tion.
Brushes not contacting slip rings.
Adjust, repair or replace affected
parts
Wires not making good connection
to brushes.
Replace brushes.
Inner and/or outer springs not mak-
ing contact to slip rings or to con-
tacts under gap hider cover.
Adjust, repair or replace affected
parts.
