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    GM Century/Lumina/Grand Prix/Intrigue 1997-2000

    General Information

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    The Stepper Motor Cruise Control (SMCC) is a speed control system which maintains a desired vehicle speed under normal driving conditions. However, steep grades up or down may cause variations in the selected speeds. The system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, TAP-UP and TAP-DOWN.

    An electronic controller and electric motor are combined in the cruise control module. The controller monitors vehicle speed and operates the electric motor. In response to the controller, the motor moves a connecting strap that is attached to the cruise control cable. The cable moves the throttle linkage to vary throttle position in order to maintain the desired cruise speed. The cruise control module contains a low speed limit which will prevent system engagement below a minimum speed, approximately 25 mph. The module is controlled by mode control switches. Cruise Control is in a "Standby Disabled" mode until all conditions inconsistent with cruise control operation are cleared.

    The cruise control inhibit criteria where the PCM will "inhibit" cruise control are:



    When the vehicle speed is less than 25 mph.
     
    When PARK, REVERSE, NEUTRAL, or 1st GEAR is indicated by the Transaxle Range Switch.
     
    When an over/under battery voltage condition exists.
     
    With low engine RPM.
     
    With high engine RPM (fuel cut-off).
     

    As with most of the computer-controlled systems on these vehicles, troubleshooting requires a qualified technician using a scan tool to extract Diagnostic Trouble Codes (DTCs) and to input test commands to the system. There are, however, some basic checks that can be made.



    Note the cruise control inhibit criteria listed above. Verify that a cruise control complaint really exists, and that the system is not being asked to operate at a time when the parameters for cruise control "enable" are not being met.
     
    Check that the cruise control module linkage is connected and moving freely.
     
    Check the stoplamp switch for proper adjustment/alignment. More information on the stoplamp switch is available in .
     
    Make sure that the center high mounted stoplamp is working. If this lamp is inoperative, the cruise control module will be disabled.
     
    Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent when loaded, and, if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
     
    Check the fuses. The cruise control system uses at least one system fuse. The stoplamps are also fused, there may be more than one fuse in the stoplamp circuit and those fuses should also be checked. Don't rely on a visual check. Remove the fuse and check for continuity with an ohmmeter. Remember, the stoplamps and the center high mounted stoplamp must be working for the circuit to the cruise control system to be complete.
     
    Check the ground. Most of these system use a black wire with an eyelet crimped on the end. A sheetmetal screw secures this ground to the inner fender, usually on the strut tower, and usually under the cruise control module itself.
     
    Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.
     
    If, after these preliminary checks are made and no problem is found, the vehicle should have the system checked by a qualified technician with a scan tool, interrogating the system through the vehicle's Data Link Connector (DLC).
     



    Click image to see an enlarged view

    Fig. Underhood wiring and cruise control module arrangement-2000 Grand Prix shown



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    Fig. Underdash wiring and cruise switch arrangement-2000 Grand Prix shown



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    Fig. Underhood wiring and cruise control module arrangement-2000 Intrigue shown



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    Fig. Underdash wiring and cruise switch arrangement-2000 Intrigue shown



    Click image to see an enlarged view

    Fig. Cruise control and hazard lamp switch, LH side of instrument panel-2000 Intrigue shown

    MAJOR SYSTEM COMPONENTS



    Cruise Control Module

    The cruise control system uses a cruise control module to obtain and hold any desired vehicle cruise speed above a minimum speed of 25 mph. The module contains the following components:



    An Electronic Controller the monitors the vehicle speed, mode control (switch) inputs, cruise control release inputs, brake switch inputs and it operates the electric stepper motor.
     
    The Stepper Motor moves the internal band in response to the controller to maintain the desired cruise speed. The cruise control cable links the internal band to the throttle lever.
     

    Cruise Control Cable

    The cable provides a physical connection between the cruise control module and the engine throttle lever. The cruise control cable is adjustable. Simply spread the adjuster lock tabs and pull out the adjuster lock to disengage the cruise control cable adjuster lock. Slide the adjuster forward, away from the module. Without moving the throttle lever, remove as much cable slack as possible. Push in on the adjuster lock to lock up the adjustment.



    Click image to see an enlarged view

    Fig. Typical cruise control cable attachment to module



    Click image to see an enlarged view

    Fig. Cruise control cable adjuster lock



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    Fig. Cruise control cable adjuster lock. Press on the lock and slide the housing to adjust

    Vehicle Speed Sensor

    The Vehicle Speed Sensor (VSS) is mounted to the automatic transaxle. The VSS provides a low voltage Alternating Current (AC) signal to the Powertrain Control Module (PCM). The PCM converts the AC signal to a pulse width modulated Direct Current (DC) signal. The signal is sent to the cruise control module at a rate of 4,000 pulse per mile.

    Cruise Control Release and Stoplamp Switches

    The cruise control release switch and the stoplamp switch are used to disengage the cruise control system. The switches are mounted on the brake pedal bracket. The switches disengage the system electrically when the brake pedal is pressed.

    The cruise control release switch and stoplamp switch are adjusted together. Incorrect adjustment of either of these switches may cause premature brake lining wear or incorrect cruise control system operation. Remove the underdash insulator panel at the brake pedal. Press the brake pedal fully. Push the switches into their retainers until the switches are fully seated. Pull the brake pedal fully rearward against the pedal stop until the audible click can no longer be heard. Verify that the cruise release switch and stoplamp switch contacts actuate at 0.125-0.500 inch of brake travel. Nominal activation of the stoplamp switch contacts occurs about 0.200 inch beyond the point of the cruise control switch activation.



    Click image to see an enlarged view

    Fig. Cruise release and stoplamp switch adjustment at the brake pedal arm-2000 Buick Century and Regal shown, others similar

     
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