GM Service Manual Online
For 1990-2009 cars only

Cruise Control System Operation WO/ETC

To Set Cruise Control

  1. Move the cruise control switch to the ON position.
  2. Accelerate to the desired speed.
  3. Push in the SET button at the end of the multifunction lever and release it.
  4. Remove your foot from the accelerator pedal.

To Resume a Set Speed

Once cruise control has been set at a desired speed with the SET button, the set speed is stored in the memory of the controller. If the driver, for any reason, must apply the brake or depress the clutch pedal, cruise control will disengage. The cruise control may be reset in this manner:

  1. Accelerate close to the desired speed (25 mph (40 km/h) or more).
  2. Move the cruise control switch from the ON position to the R/A (Resume/Accelerate) position for about half a second.
  3. The vehicle will accelerate to and resume the previously set speed.

If either the ignition switch or the cruise ON/OFF switch is turned off, the cruise control memory will be erased.

To Reduce Speed While Using Cruise Control

There are two ways to reduce your speed while using cruise control.

  1. Push in and hold the set button at the end of the lever until you reach the lower speed you want. Then release it.
  2. To slow down incrementally, push the set button for less than half a second. Each time you do this, the vehicle will slow down 1.6 km/h (1 mph).

To Increase Speed While Using Cruise Control

There are two ways to increase speed while using cruise control.

  1. Accelerate to the higher speed, and push the SET button at the end of the multi-function lever. Then release the button and the accelerator pedal. The cruise control will now maintain that higher set speed.
  2. Once a set speed has been chosen, the driver can move the cruise switch from the ON position to the R/A position and hold it there until the new speed setting is reached. Then release the switch. To increase your speed incrementally, move the switch to R/A for less than half a second and release it. Each time you do this, the vehicle will go 1.6 km/h (1 mph) faster.

The accelerate feature will only work after you turn on the cruise control and push the SET button.

Passing Another Vehicle While Using Cruise Control

Use the accelerator pedal to increase your speed. Once you are a safe distance past the other vehicle, remove your foot from the accelerator pedal. The vehicle will then return to the preset cruise control speed.

Using Cruise Control on Hills

How well the cruise control will work on hills depends upon your speed, load, and the incline of the hills. When going up steep hills, you may have to step on the accelerator pedal to maintain your speed. When going downhill, you may have to brake or shift to a lower gear to maintain your speed. However, applying the brake will turn off the cruise control. Many drivers find this to be too much trouble and choose not to use cruise control on steep hills.

To Erase Cruise Speed Memory

Cruise control set speed memory is erased in either of the following two ways:

    • The ignition is turned off.
    • The cruise control ON/OFF switch is turned off.

To Disengage Cruise Control

There are three ways to turn off the cruise control:

  1. Step lightly on the brake pedal.
  2. Move the cruise switch to the OFF position.
  3. Press the clutch pedal

Cruise Control Multifunction Turn Signal Lever

The multifunction turn signal lever contains the normally open ON/OFF, SET and R/A switches. It cannot be serviced. The complete multi-function turn signal lever must be replaced as an assembly. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column -- Tilt.

Cruise Release (Brake) Switch

The cruise release (brake) switch is a normally closed switch mounted on the brake pedal bracket. For adjustment of the cruise release (brake) switch, refer to Cruise Release Switch Adjustment .

Stoplamp Switch

The stoplamp switch is a normally open switch mounted on the brake pedal bracket. For adjustment of the stoplamp switch, refer to Stop Lamp Switch Adjustment in Hydraulic Brakes.

Cruise Control (Clutch) Switch

The cruise control clutch switch if equipped, is a normally closed switch mounted on the clutch pedal bracket.

Cruise Control System Operation W/ETC

The operation of the TAC module is through the function control switches located on the multifunction turn signal lever. The cruise control function control switches includes the ON/OFF, SET/COAST, R/A (resume/accelerate). The switch assembly provides driver control of the cruise control system.

The stop lamp switch, cruise release switch or CPP switch if equipped, is used to disengage the cruise control. A cruise control release switch circuit and a stoplamp switch circuit are used. The stop lamp, cruise release and CPP switches are mounted to the brake pedal bracket . To disengage the system the driver presses the brake pedal or clutch pedal, if equipped. The speed of the vehicle at brake actuation will be stored in the memory of the TAC module.

With cruise control, the vehicle can maintain a speed of about 40 km/h (25 mph) or more without keeping your foot on the accelerator. When the driver turns off the cruise control ON/OFF switch or ignition switch, the cruise control turns off. The vehicle speed stored in the memory of the TAC module will be lost.

When the cruise switch is in the ON position, and the driver presses the SET/COAST button, the TAC module notifies the PCM that the cruise control is requested. The PCM then checks to see that the cruise control enable criteria is met. If the cruise control criteria has been met the PCM sends a class 2 message to the instrument panel cluster (IPC) to illuminate the cruise light, if equipped

The PCM will inhibit cruise control:

    • When vehicle speed is less than 40 km/h (25 mph).
    • When in PARK, REVERSE, NEUTRAL, or 1st gear.
    • With low engine RPM
    • With high engine RPM (fuel cut-off)
    • When vehicle speed is to high
    • When an over or under charged battery voltage condition exists
    • Antilock brake system/traction control system is active for more than 2 seconds
    • A 6 MPH or more decrease in a non- drive wheel speed in 0.4 seconds with out seeing the extended brake travel contacts of the stop lamp switch transition.

If the PCM determines that any of the cruise control inhibit conditions are present, the PCM will disengage the cruise control. The PCM accomplishes this through data communication with the TAC module. If the PCM disables the cruise control for an inhibiting event it will record the reason for disengagement in the Disengage Definition data file Refer to Scan Tool Data Definitions in Engine Controls.