GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Silhouette Ext. 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Drive the vehicle above 25 mph.
  2. Place the cruise switch to the ON position.
  3. Depress the SET switch once.
  4. Release the switch.
  5. Remove your foot from the accelerator pedal.

The vehicle maintains the set speed. The set speed is the speed of the vehicle at the time that the SET button was released.

The vehicle does not retain the set speed. Go to Cruise Control Inoperative .

2
  1. Depress and hold the SET switch until the vehicle speed decreases by 4 to 5 mph.
  2. Release the SET switch.

If the speed is above 25 mph, the following actions occur:

    • The vehicle decelerates.
    • The vehicle maintains a new lower set speed.

The vehicle does not decelerate and maintain a lower speed. Go to Does Not Resume, Accelerate, or Tap Up or Down .

3
  1. Depress and hold the R/A switch until the vehicle speed increases by 4 to 5 mph.
  2. Release the R/A switch.
    • The vehicle accelerates.
    • The vehicle maintains a new higher set speed.

The vehicle does not accelerate and maintain a higher speed. Go to Does Not Resume, Accelerate, or Tap Up or Down .

4

Depress the brake pedal slightlly.
    • The cruise control disengages.
    • The memory is unchanged.

Cruise control does not disengage. Go to Cruise Control Does Not Disengage with Brake Pedal .

5
  1. Depress the R/A switch once, for less than ¾ second.
  2. Release the switch.

The vehicle accelerates and maintains the previously set speed.

The vehicle does not accelerate and maintain the previously speed. Go to Does Not Resume, Accelerate, or Tap Up or Down .

6
  1. Depress the R/A switch once, for less than ¾ second.
  2. Release the switch.

The vehicle speed increases by 1 mph and maintains the new set speed.

The vehicle does not accelerate and maintain a higher speed. Go to Does Not Resume, Accelerate, or Tap Up or Down .

7
  1. Depress the SET switch once, for less than ½ second.
  2. Release the switch.

The vehicle speed decreases by 1 mph and maintains the new set speed.

Vehicle speed does not decrease. Go to Does Not Resume, Accelerate, or Tap Up or Down .

8
  1. Depress the following switches simultaneously:
    2. • The SET switch
    • The R/A switch
  2. Depress the R/A switch once, for less than ¾ second.
  3. Release the switch.
  4. Place the cruise switch in the OFF position.
    • The vehicle will be put into non-cruise mode.
    • The memory will be unchanged.
    • The vehicle accelerates to the previous set speed and maintains that speed.
    • The cruise control disengages.
    • The memory is off.

The vehicle does not accelerate and maintain the previously speed. Go to Does Not Resume, Accelerate, or Tap Up or Down .

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.

Additional System Check

Use the following procedures as a system test in order to verify the operation of the cruise control system after repairs:

  1. Set the park brake.
  2. Start the engine.
  3. Move the cruise switch to the OFF position.
  4. Move the cruise switch to the ON position.
  5. Wait at least 3 seconds.
  6. Fully depress and hold the brake pedal.
  7. Press the cruise SET switch in and hold the switch.
  8. Hold the cruise slider switch in the R/A position.

    9. Wait 10 seconds.

  9. Release the brake pedal while still holding the R/A and the SET switches.
  10. The engine RPM should increase momentarily, and then the engine RPM should return to normal.