Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Ignition Switch and Lock Cylinder

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REMOVAL & INSTALLATION



Removal and installation for the 1969-72 instrument panel mounted switch is in .

Lock Cylinder
1973-78 MODELS


Click image to see an enlarged view

Fig. Fig. 1 Removing the ignition lock cylinder-1973-78 models

The key and lock code numbers are kept in the records of the original selling dealer. This number enables a dealer to supply a new lock cylinder that will operate with the old key.

  1. Remove steering wheel and turn signal switch as previously outlined.
  2.  

It is not necessary to completely remove the turn signal switch. Pull the switch over the end of the shaft-no farther.

  1. Place lock cylinder in the Run position.
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  3. Insert a small screwdriver into the rectangular column housing slot. Keeping the screwdriver to the right-side of the slot, break the housing flash loose and depress the spring latch at the lower end of the lock cylinder. Remove the lock cylinder.
  4.  

When ordering a new lock cylinder, specify a cylinder assembly. This will save assembling the cylinder, washer, sleeve and adapter.

To install:

  1. Hold the lock cylinder sleeve and rotate the knob clockwise against the stop. Insert the cylinder into the housing, aligning the key and keyway. Hold a 0.070 inch drill bit between the lock bezel and housing. Rotate the cylinder counterclockwise, maintaining a light pressure until the drive section of the cylinder mates with the sector. Push in until the snapring pops into the grooves. Remove the bit. Check cylinder operation.
  2.  


WARNING
The drill prevents forcing the lock cylinder inward beyond its normal position. The buzzer switch and spring latch can hold the lock cylinder in too far. Complete disassembly of the upper bearing housing is necessary to release an improperly installed lock cylinder.

1979-82 MODELS


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Fig. Fig. 2 Exploded view of the lock cylinder and its retainers-1979-82 models

  1. Remove the steering wheel and the turn signal switch as previously outlined. It is not necessary to completely remove the turn signal switch. Just pull the switch out far enough so it can hang out of the steering column shaft. Do not disconnect the wiring harness.
  2.  
  3. With the lock cylinder in the Run position, remove the lock cylinder and attaching screw and the cylinder.
  4.  
  5. To install, align the cylinder key with the keyway in the housing and rotate the key all the way clockwise while holding the cylinder body.
  6.  
  7. Insert the cylinder into the housing and install the attaching screw.
  8.  
  9. Install the turn signal switch and the steering wheel as previously outlined.
  10.  

Ignition Switch
1973-82 MODELS


Click image to see an enlarged view

Fig. Fig. 3 Cross-sectional view of the ignition switch-1973-82 models

The switch is on the steering column, behind the instrument panel.

  1. Lower the steering column, making sure that it is supported.
  2.  


WARNING
Extreme care is necessary to prevent damage to the collapsible column.

  1. Make sure the switch is in the Lock position. If the lock cylinder is out, pull the switch rod up to the stop, then go down one detent.
  2.  
  3. Remove the two screws and the switch.
  4.  

To install:

  1. Before installation, make sure the switch is in the Lock position. The switch can be moved to the Lock position using a screwdriver inserted into the locking rod slot.
  2.  
  3. Install the switch using the original screws.
  4.  


WARNING
Use of screws that are too long could prevent the column from collapsing on impact.

  1. Replace the column.
  2.  

 
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