GM Astro/Safari 1985-1996 Repair Guide

Windshield Wiper Switch

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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 Column Without Air Bag
  1. Disconnect the negative battery cable.
  2.  
  3. Matchmark and remove the steering wheel.
  4.  
  5. If necessary for access, remove the steering column.
  6.  

Although in some cases the components necessary to remove the wiper switch may be removed with the steering column installed in the vehicle, it is usually necessary to at least unbolt, lower and support the column.

  1. Remove the turn signal switch.
  2.  
  3. Remove the lock cylinder assembly.
  4.  
  5. Remove the lock housing cover screws.
  6.  
  7. If applicable, remove the tilt lever.
  8.  
  9. Remove the lock housing cover assembly.
  10.  
  11. Except for vehicles with a floor shift, remove the column housing cover end cap (in some cases, this should be done along with the switch rod actuator), then remove the switch actuator pivot pin.
  12.  
  13. If necessary, unbolt the steering column support bracket from the column.
  14.  
  15. Disengage the wiper switch (pivot and pulse switch) connector from the wiring harness, then remove the wiring protector.
  16.  
  17. Attach a length of mechanic's wire to the switch connector, then carefully pull the harness through the column (from the top), leaving the wire in the column for assembly.
  18.  
  19. Remove the switch.
  20.  

To install:
  1. Install the switch to the lock housing cover assembly, then install the pivot pin.
  2.  
  3. Except for vehicles equipped with floor shift:
    1. Carefully pull the switch harness through the steering column using the mechanic's wire, then engage the connector to the harness.
    2.  
    3. If applicable, install the column support bracket.
    4.  
    5. Lubricate the dimmer switch rod actuator using lithium grease, then if removed, install the actuator to the column housing cover end cap.
    6.  
    7. Install the end cap to the lock housing cover assembly. Make sure the bottom edge of the dimmer switch rod actuator is resting on the bend in the dimmer switch rod.
    8.  
    9. Install the lock housing cover assembly, then secure using the retaining screws. Tighten the screw in the 12 o'clock position first, then the 8 o'clock position next and finally the screw in the 3 o'clock position.
    10.  

  4.  
  5. On vehicles equipped with a floor shift:
    1. Install the gearshift bowl shroud to the floor shift lever bowl.
    2.  
    3. Install the bowl with shroud to the steering column assembly, then secure using the 3 cross recess screws.
    4.  
    5. Using the mechanic's wire, gently pull the wiper and turn signal switch wiring through the column.
    6.  
    7. Install the upper bearing retainer, then install the lock housing cover assembly to the jacket. Finger-tighten the cover screws in a clockwise pattern, then tighten the screws to 47 inch lbs. (5.3 Nm).
    8.  
    9. Install the wiring protectors and the support bracket.
    10.  

  6.  
  7. Install the lock cylinder assembly.
  8.  
  9. Install the turn signal switch.
  10.  
  11. If removed or lowered, position and secure the steering column.
  12.  
  13. Align and install the steering wheel.
  14.  
  15. Connect the negative battery cable.
  16.  

Steering Column With Air Bag
EXCEPT 1996 MODELS
  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.  

Although in some cases the components necessary to remove the wiper switch may be removed with the steering column installed in the vehicle, it is usually necessary to at least unbolt, lower and support the column.

  1. Remove the turn signal switch.
  2.  
  3. Remove the lock cylinder assembly.
  4.  
  5. Remove the lock housing cover screws.
  6.  
  7. If applicable, remove the tilt lever.
  8.  
  9. Remove the lock housing cover assembly.
  10.  
  11. Remove the column housing cover end cap (in some cases, this should be done along with the switch rod actuator), then remove the switch actuator pivot pin.
  12.  
  13. If necessary, unbolt the steering column support bracket from the column.
  14.  
  15. Disengage the wiper switch (pivot and pulse switch) connector from the wiring harness, then remove the wiring protector.
  16.  
  17. Attach a length of mechanic's wire to the switch connector, then carefully pull the harness through the column (from the top), leaving the wire in the column for assembly.
  18.  
  19. Remove the switch.
  20.  

To install:
  1. Install the switch to the lock housing cover assembly, then install the pivot pin.
  2.  
  3. Carefully pull the switch harness through the steering column using the mechanic's wire, then engage the connector to the harness.
  4.  
  5. If applicable, install the column support bracket.
  6.  
  7. Lubricate the dimmer switch rod actuator using lithium grease, then if removed, install the actuator to the column housing cover end cap.
  8.  
  9. Install the end cap to the lock housing cover assembly. Make sure the bottom edge of the dimmer switch rod actuator is resting on the bend in the dimmer switch rod.
  10.  
  11. Install the lock housing cover assembly, then secure using the retaining screws. Tighten the screw in the 12 o'clock position first, then the 8 o'clock position next and finally the screw in the 3 o'clock position.
  12.  
  13. Install the lock cylinder assembly.
  14.  
  15. Install the turn signal switch.
  16.  
  17. If removed or lowered, position and secure the steering column.
  18.  
  19. Align and install the steering wheel.
  20.  
  21. Make sure the ignition is OFF , then connect the negative battery cable.
  22.  
  23. Properly enable the SIR system.
  24.  

1996 MODELS

These vehicles use a combination switch assembly instead of a separate switch mounted in the column. For more details, please refer to the Combination Switch procedure found later in this section.

 
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