GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Back-Up Lamp/Neutral Safety Switch

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The back-up lamp/neutral safety switch assembly is mounted either on the steering column or on the floor shifter assembly, under the console, depending on the vehicle and application. Most 1994 models utilize a steering column mounted shifter for the automatic transmission, therefore the switch will be found on the steering column for those vehicles covered by this information. For the removal, installation and adjustment procedures on transmission mounted switches (1995-99 models), please refer to the back-up lamp/neutral safety switch procedures in Chassis Electrical , of this repair guide.

COLUMN MOUNTED SWITCH

See Figures 1 and 2



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Fig. Fig. 1: Installation and adjustment of the early model bolt-on back-up lamp/neutral safety switch

Two types of switches are generally found on these vehicles. Some early models will be equipped with adjustable switches which are bolted into position. Most vehicles covered by this information should be equipped with ratcheting self-adjusting switches.

  1. Disconnect the negative battery cable.
  2.  
  3. If necessary for access, remove the steering column insulator/filler panel for access to the switch.
  4.  
  5. Unplug the electrical harness connector from the switch.
  6.  
  7. Remove the switch by grasping and pulling it straight out of the steering column jacket.
  8.  

To install:
  1. If equipped with an early model switch which is bolted into position, the switch should be equipped with a gauge hole for adjustment. If equipped, loosely install the switch to the column and adjust following the procedures in the illustration.
  2.  
  3. Most vehicles covered by this information utilize a self-adjusting (ratcheting) switch. To adjust:
    1. Align the actuator on the switch with the holes in the shift tube.
    2.  
    3. Set the parking brake and place the gear selector in Neutral.
    4.  
    5. Press down on the front of the switch until the tangs snap into the rectangular holes in the steering column jacket.
    6.  
    7. Adjust the switch by moving the gear selector to P . The main housing and the housing back should ratchet, providing the proper switch adjustment.
    8.  

  4.  
  5. Attach the harness connector to the switch.
  6.  
  7. Connect the negative battery cable, then verify proper switch operation. Make sure the reverse lights work and that the ignition will only work in the N or P positions. If necessary, readjust the switch. For ratcheting type switches, move the gear selector all the way to the L position, then repeat the adjustment.
  8.  
  9. If applicable, install the steering column insulator/filler panel.
  10.  

FLOOR CONSOLE MOUNTED SWITCH
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the center console for access to the switch assembly.
  4.  
  5. Disengage the switch electrical connector.
  6.  
  7. Remove the retaining nuts, then remove the switch from the vehicle.
  8.  
  9. If necessary, remove the gauge pin from the switch.
  10.  
  11. If installing a new switch:
    1. Place the shift control lever in N .
    2.  
    3. Align the carrier tang on the back-up lamp/neutral safety switch with the slot on the shifter.Replacement switches are pinned in the N position to ease installation. If the switch has been rotated or the switch is broken, install the switch using the "old switch'' installation and adjustment procedure.
    4.  
    5. Tighten the switch retaining nuts to 30 inch lbs. (3.4 Nm), then engage the switch connector.
    6.  
    7. Move the shift control lever out of Neutral in order to shear the plastic pin, then remove the accessible piece(s) of the gauge pin.
    8.  

  12.  
  13. If installing an old switch, install and adjust the switch to assure proper operation:
    1. Place the shift control lever in N .
    2.  
    3. Align the carrier tang on the switch with the slot on the shifter.
    4.  
    5. Loosely install the retaining switch nuts and engage the wiring connector.
    6.  
    7. Rotate the switch to align the service adjustment hole with the carrier tang hold, then use a 0.09 in. (2.34mm) gauge pin to complete adjustment. Insert the pin in the service adjustment hole and rotate the switch until it drops to a depth of 0.59 in. (15mm). Hold the switch in this position and tighten the retaining nuts to 30 inch lbs. (3.4 Nm).
    8.  

  14.  
  15. Install the center console.
  16.  
  17. Connect the negative battery cable.
  18.  
  19. Verify proper switch operation.
  20.  



Click image to see an enlarged view

Fig. Fig. 2: Ratcheting type back-up lamp/neutral safety switch mounting

 
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