GM Astro/Safari 1985-1996 Repair Guide

Ignition Lock Cylinder

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When servicing any components on the steering column, should any fasteners require replacement, be sure to use only nuts and bolts of the same size and grade as the original fasteners. Using screws that are too long could prevent the column from collapsing during a collision.

REMOVAL & INSTALLATION



Steering Columns Without Air Bag

See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the lock cylinder mounting-early-model shown (late-model, except 1996, similar)

  1. Disconnect the negative battery cable.
  2.  
  3. Refer to the Turn Signal Switch, Removal and Installation procedures in this section and remove the turn signal switch.
  4.  
  5. Place the lock cylinder in the RUN position.
  6.  
  7. Remove the buzzer switch, the lock cylinder screw and the lock cylinder.
  8.  


CAUTION
If the screw is dropped upon removal, it could fall into the steering column, requiring complete disassembly to retrieve the screw.

To install:
  1. Rotate the lock cylinder clockwise to align the cylinder key with the keyway in the housing.
  2.  
  3. Push the lock cylinder all the way in.
  4.  
  5. Install the cylinder lock-to-housing screw. Tighten the screw to 14 inch lbs. (1.6 Nm).
  6.  
  7. Connect the negative battery cable and check operation.
  8.  

Steering Column With Air Bag
EXCEPT 1996 MODELS

See Figure 1

  1. Properly disable the SIR (air bag) system, then disconnect the negative battery cable. For details on disabling the air bag system, please refer to Chassis Electrical of this information.
  2.  
  3. Matchmark and remove the steering wheel.
  4.  
  5. Remove the SIR coil assembly retaining ring, then remove the coil assembly and allow it to hang freely from the wiring. Remove the wave washer.
  6.  

On some SIR equipped vehicles, it may be necessary to completely remove the coil and wiring from the steering column before removing the lock cylinder assembly. If so, attach a length of mechanic's wire to the coil connector at the base of the column, then carefully pull the harness and wire through the steering column towards the top. Leave the wire in position inside the column in order to pull the harness back down into position during installation.

  1. Remove the turn signal switch from the column and allow it to hang from the wires (leaving them connected).
  2.  
  3. Remove the buzzer switch assembly. On some vehicles it may be necessary to temporarily remove the key from the lock cylinder in order to remove the buzzer. If so, the key should be reinserted before the next step.
  4.  
  5. Carefully remove the lock cylinder screw and the lock cylinder. If possible, use a magnetic tipped screwdriver on the screw in order to help prevent the possibility of dropping it.
  6.  


CAUTION
If the screw is dropped upon removal, it could fall into the steering column, requiring complete disassembly in order to retrieve the screw and prevent damage.

To install:
  1. Align and install the lock cylinder set.
  2.  
  3. Push the lock cylinder all the way in, then carefully install the retaining screw. Tighten the screw to 22 inch lbs. (2.5 Nm) on tilt columns or to 40 inch lbs. (4.5 Nm) on standard non-tilt columns.
  4.  
  5. If necessary, install the buzzer switch assembly.
  6.  
  7. Reposition and secure the turn signal switch assembly
  8.  

The coil assembly will become uncentered if the steering column is separated from the steering gear and allowed to rotate or if the centering spring is pushed down, letting the hub rotate while the coils assembly is removed from the steering column.

  1. Make sure the coil is centered, then install the wave washer, followed by the coil and the retaining ring. The coil ring must be firmly seated in the shaft groove.
  2.  
  3. Align and install the steering wheel.
  4.  
  5. Make sure the ignition is OFF , then connect the negative battery cable.
  6.  
  7. Properly enable the SIR system.
  8.  

1996 MODELS

See Figures 2 and 3



Click image to see an enlarged view

Fig. Fig. 2: Lock cylinder and upper shroud removal



Click image to see an enlarged view

Fig. Fig. 3: During installation, make sure the tab on the lock cylinder and the sector in the cylinder module assembly are aligned

  1. Properly disable the SIR (air bag) system, then disconnect the negative battery cable. For details on disabling the air bag system, please refer to Chassis Electrical of this information.
  2.  
  3. Either lower the steering column from the instrument panel for access or unbolt and remove the column. If the column is removed, prevent it from rotating so the SIR coil does not become uncentered.
  4.  
  5. If applicable, remove the tilt lever by pulling outward.
  6.  
  7. Remove the 2 pan head tapping screws from the lower column shroud, then tilt the shroud down and slide it back to disengage the locking tabs. Remove the lower shroud.
  8.  
  9. Remove the 2 Torx head screws from the upper shroud.
  10.  
  11. Lift the upper shroud for access to the lock cylinder hole. Hold the key in the START position and use a 1 / 16 in. Allen wrench to push on the lock cylinder retaining pin.
  12.  
  13. Release the key to the RUN position and pull the steering column lock cylinder set from the lock module assembly. Remove the upper shroud.
  14.  

To install:
  1. Install the upper shroud and lock cylinder. With the key installed to the lock cylinder and turned to the RUN position, make sure the sector in the lock module is also in this position.
  2.  
  3. Install the lock cylinder to the upper shroud, then align the locking tab and positioning tab with the slots in the lock module assembly. With the tabs aligned, carefully push the cylinder into position.
  4.  
  5. Install the upper shroud Torx head retaining screws and tighten to 12 inch lbs. (1.4 Nm).
  6.  
  7. Install the lower shroud, making sure the slots on the shroud engage with the upper shroud tabs. Tilt the lower shroud upward and snap the shrouds together.
  8.  
  9. Install the 2 lower shroud pan head retaining screws and tighten to 53 inch lbs. (6.0 Nm).
  10.  
  11. Move the shift and multi-function lever seals into position.
  12.  
  13. If applicable, install the tilt lever by aligning and pushing inward.
  14.  
  15. Position and secure the steering column.
  16.  
  17. Make sure the ignition is OFF , then connect the negative battery cable.
  18.  
  19. Properly enable the SIR system.
  20.  

 
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