Lock Cylinder Replacement; Tone Alarm Switch Replacement; Ignition Switch Replacement - GMC G Service Manual

LOCK CYLINDER REPLACEMENT

M Remove or Disconnect (Figure 15)
• Place the lock cylinder in the "RUN" position.
1. Steering wheel. Refer to "Steering Wheel Replace­
ment" in this section.
2. Turn signal switch. Refer to "Turn Signal Switch
Replacement" in this section.
• It is not necessary to completely remove the
turn signal switch from the column. Pull the
switch rearward far enough to slip it over the
end of the shaft. Do not pull the harness out of
the column.
3. Retaining screw and the lock cylinder set.
I ! | Important
• If the retaining screw is dropped on removal, it
could fall into the column, requiring a complete
disassembly to retrieve the screw.
A. Hold the lock cylinder sleeve and rotate the
knob clockwise against the stop.
B. Lock Cylinder Set
C. Cylinder Key
D. Lock Retaining Screw
Figure 15 — Lock Cylinder Installation
H Install or Connect (Figure 15)
1. Lock cylinder set.
• Align the cylinder key with the keyway in the
housing. Rotate as shown in figure 15.
• Push the lock all the way in.
2. Retaining screw.
STEERING COLUMN 3B4-17
I f f l Tighten
• Screw to 4.5 N«m (40 in. lbs.) (Non-Tilt Col­
• Screw to 2.5 N»m (22 in. lbs.) (Tilt Columns).
3. Turn signal switch. Refer to "Turn Signal Switch
Replacement" in this section.
4. Steering wheel. Refer to "Steering Wheel Replace­
ment" in this section.
TONE ALARM SWITCH
M Remove or Disconnect
1. Steering wheel. Refer to "Steering Wheel Replace­
ment" in this section.
• Pull the turn signal switch up far enough to allow
• The tone alarm switch may be removed without
A
2. Tone alarm switch assembly (33) (figure 17).
• Pull the tone alarm switch straight out of the
I ? | Important
• Be careful not to let the flat spring fall down into
B Install or Connect
1. Tone alarm switch to the spring clip with the formed
end of the clip around the lower end of the switch. The
spring is bowed away from the switch.
• Lay the spring on the switch opposite the
contacts.
2. Tone alarm switch and spring into the hole with the
contacts toward the lock cylinder bore.
3. Turn signal switch. Refer to "Turn Signal Switch
Replacement" in this section.
B-07394
4. Steering Wheel. Refer to "Steering Wheel Replace­
ment" in this section.

IGNITION SWITCH REPLACEMENT

The ignition switch is mounted on top of the column
jacket near the front of the dash, inside the channel section
of the brake pedal support.
The switch is actuated by a rod and rack assembly. A
portion of the rack is toothed and engages a gear on the
end of the lock cylinder. This enables the rod and rack to be
moved axially (with respect to the column) to actuate the
switch when the lock cylinder is rotated.
umns).
REPLACEMENT
access to the tone alarm switch. Refer to "Turn
Signal Switch Replacement" in this section.
removing the lock cylinder. The lock cylinder
must be in the "RUN" position.
housing using a paper clip or similar tool. A flat
spring wedges the switch toward the lock
cylinder.
the housing and do not pull on the switch con­
tacts or plastic material of the switch when
removing.