GMC 1982 Light Duty Truck Service Manual page 290

3B4-2 STEERING COLUMNS
GENERAL INFORM ATION
This section contains diagnostic information to help
locate the cause of the problem in the column. Reference
should be made to the correct method of column
disassembly, repair, adjustment and reassembly. Damaged,
broken or deformed parts must be replaced with the correct
replacement.
To perform diagnostic procedures on the steering
column upper end components, it is not necessary to remove
the column from the vehicle.
The steering wheel, horn components, directional
signal switch, ignition switch and lock cylinder may be
removed with the column remaining in the vehicle as
described in the Service Manual under "Component Part
Replacement".
CAUTION: The outer mast jacket shift
tube, steering shaft and instrument panel
mounting bracket are designed as energy
absorbing units. Because of the design of
these components,
necessary to handle the column with care
when performing any service operation.
Avoid hammering, jarring, dropping or
leaning on any portion of the column.
When reassembling
components, use
screws, nuts and bolts and tighten to
specified torque.
exercised not to use over-length screws
or bolts as they may prevent a portion of
the column from compressing under
impact. Personal injury could result from
lack of care when servicing the steering
column.
F ig . 3 B 4 - 1 - S t e e r in g C o lu m n
D IA G N O S IS
it is absolutely
the column
only the specified
Care should be
STEERING COLUMN ELECTRICAL ANALYZER
J-23980
For C-Series and K-Series (Fig. 3B4-2)
Tool J-23980 will help the technician analyze the
steering column wiring harness for electrical problems. The
tool in actuality eliminates the steering column, related
wiring and components; and replaces them with the tool
itself. In this way disassembly of the column is not
performed until the problem has been determined to be
the column. By moving the tester switch, (with the key in
the "on" position), the various functions may be checked.
The switch positions are "O F F ",
Fig. 3 B 4 -2 -S te e rin g Colum n E lectrical Analyzer J -2 3 9 8 0
in
"H O R N ", "L E FT