GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Control Switches

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REMOVAL & INSTALLATION



Engagement Switch

See Figure 1



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Fig. Fig. 1: The cruise control engagement switch is part of the multi-function lever assembly; the switch and lever must be replaced as an assembly

The cruise control actuator switch on most of these vehicles is part of the multi-function lever located on the steering column.

  1. Disconnect the negative battery terminal.
  2.  
  3. Detach the cruise control switch electrical connector. The connector may be located at the base of steering column or on the backside of the switch. It may be necessary to remove an under dash panel or trim piece for access.
  4.  
  5. Make sure the lever is in the CENTER or OFF position.
  6.  
  7. Pull lever straight out of retaining clip within the steering column.
  8.  
  9. Attach mechanic's wire or similar wire to the connector; gently pull the harness through the column, leaving the pull wire in place.
  10.  

To install:
  1. Place the transmission selector in LOW or 1 . Attach the mechanic's wire to the connector. Gently pull the harness into place, checking that the harness is completely clear of any moving or movable components such as tilt-column, telescoping column, brake pedal linkage, etc.
  2.  
  3. Position the lever and push it squarely into the retainer until it snaps in place.
  4.  
  5. Remove the mechanics' wire and attach the cruise control harness connector.
  6.  
  7. Reinstall any panels or insulation which were removed for access.
  8.  
  9. Connect the negative battery terminal.
  10.  

Brake/Clutch Release Switches

All factory or dealer installed cruise control systems for these vehicles are equipped with either a brake or clutch release switch. The purpose of the switch is to deactivate the system when the driver begins to depress the pedal. Most of the switches found on earlier models are vacuum break switches (vacuum release valves) which will therefore have a vacuum line attached to rear of side of the switch. A vacuum break switch is used to quickly vent vacuum to the atmosphere so a vacuum controlled servo may return the throttle to the idle position. Later models may use a vacuum switch, an electric switch, or a combined vacuum and electric switch.

  1. Disconnect the negative battery cable. At the brake switch, remove either the 2 electrical connectors or the electrical connector and the vacuum hose.
  2.  
  3. Remove the switch from the retainer.
  4.  
  5. Remove the tubular retainer from the brake pedal mounting bracket.
  6.  

To install:
  1. Install the tubular retainer to the brake pedal mounting bracket.
  2.  
  3. Press the brake pedal and install the release switch into the retainer until fully seated in the clips.
  4.  
  5. Connect the wiring and/or vacuum lines. Adjust the switch.
  6.  

ADJUSTMENT
  1. Depress the brake pedal and check that the release switch is fully seated in the clips.
  2.  
  3. Slowly pull the brake pedal back to the at-rest position; the switch and valve assembly will move within the clips to the adjusted position.
  4.  
  5. Slowly pull the brake pedal back to the at-rest position; the switch and valve assembly will move within the clips to the adjusted position. Measure pedal travel and check switch engagement. The electric brake release switch contacts must open at 1 / 8 - 1 / 2 in. (3-13mm) of pedal travel when measured at the centerline of the pedal pad. The brake lights should illuminate after another 1 / 6 in. (5mm) of travel. The vacuum release should engage at 5 / 8 -1 in. (16-25mm) of pedal travel.
  6.  

 
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