GM Full-Size Trucks 1988-1998 Repair Information

Turn Signal (Combination) Switch

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REMOVAL & INSTALLATION



1988-94 Models

See Figures 1, 2, 3 and 4


CAUTION
When performing service around the SIR system components or wiring, the SIR system MUST be disabled. Failure to do so could result in possible air bag deployment, personal injury or unneeded SIR system repairs.

  1. Make sure the switch is in the off position.
  2.  
  3. Remove the steering wheel as outlined in this section.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Retaining ring removal



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Fig. Fig. 2: Pliers may be used to remove the turn signal wire protector



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Fig. Fig. 3: Removing the turn signal switch



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Fig. Fig. 4: Install the lockplate and the retaining ring using the tool illustrated (or its equivalent)

  1. Remove the instrument panel trim cover.
  2.  
  3. Insert a screwdriver into the lockplate cover slot and pry out the cover. Remove the lockplate. A special tool is available to do this. The tool is an inverted U-shape, with a hole for the shaft. The shaft nut is used to force it down. Pry the wire snapring out of the shaft groove. Discard the snapring.
  4.  
  5. Remove the tool and lift the lockplate off the shaft.
  6.  
  7. Remove the turn signal lever screw and lever.
  8.  
  9. Press the hazard button inward and unscrew it.
  10.  
  11. Remove the switch retaining screws. Pull the switch connector out of the mast jacket and feed the switch connector through the column support bracket.
  12.  
  13. Position the turn signal lever and shifter housing in the downward, or "low" position and pull downward on the lower end of the column using a pliers on the tab provided. Remove the wire protector.
  14.  
  15. Remove the switch mounting screws. Remove the switch by pulling it straight up while guiding the wiring harness cover through the column.
  16.  

To install:
  1. Install the replacement switch by working the connector and cover down through the housing and under the bracket.
  2.  
  3. Install the switch mounting screws and the connector on the mast jacket bracket. Install the column-to-dash trim plate.
  4.  
  5. Install the flasher knob and the turn signal lever.
  6.  
  7. With the turn signal lever in neutral and the flasher knob out, slide the thrust washer, upper bearing preload spring, and canceling cam into the shaft.
  8.  
  9. Position the lockplate on the shaft and press it down until a new snapring can be inserted in the shaft groove.
  10.  
  11. Install the cover and the steering wheel.
  12.  

1995-98 Models

See Figure 5


CAUTION
When performing service around the SIR system components or wiring, the SIR system MUST be disabled. Failure to do so could result in possible air bag deployment, personal injury or unneeded SIR system repairs.

  1. Make sure the switch is in the off position.
  2.  
  3. Remove the steering wheel as outlined in this section.
  4.  
  5. Disconnect the tilt wheel lever by pulling it out.
  6.  
  7. Remove the knee bolster and the Torx® head screws from the lower column cover.
  8.  
  9. Lower the cover by tilting it down and then sliding it back to disengage the locking tabs.
  10.  
  11. Remove the Torx® head screws from the upper column cover.
  12.  
  13. Remove the steering column lock set and the upper cover.
  14.  
  15. Disconnect the wiring harness straps from the steering column wiring harness.
  16.  
  17. Remove the retainer from Connector Position Assurance (CPA) if equipped.
  18.  
  19. Disengage the connector from the Brake Transmission Shift Interlock (BTSI) if equipped.
  20.  
  21. Unplug the gray and black connectors from the bulkhead connector.
  22.  
  23. Unfasten the Torx® head screws from the switch and remove the switch.
  24.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the multi-function switch-1996-98 C/K series

To install:

Installation is the reverse of removal but please note the following important steps.

  1. Install the switch. Use a small blade screwdriver to compress the electrical contact and move the switch into position. The electrical contact must rest on the canceling cam assembly.
  2.  
  3. Fasten the Torx® head screws on the switch. Tighten the screws to 53 inch. lbs. (6 Nm).
  4.  
  5. Install the upper column cover and fasten the column bracket nuts. Tighten the nuts to 22 ft. lbs. (30 Nm).
  6.  
  7. Install the knee bolster and the steering column cylinder lock. Tighten the column cover Torx® screws to 12 inch. lbs. (1.4 Nm).
  8.  
  9. Install the lower column cover and tighten the Torx® screws 53 inch. lbs. (6 Nm).
  10.  
  11. Make sure the switch is in the off position and install the steering wheel. Refer to this section for this procedure.
  12.  
  13. Enable the SIR system (if equipped).
  14.  

 
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