Circuit Operation

The Stepper Motor Cruise Control is a Speed Control System which maintains a desired speed under normal driving conditions. The system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, TAP-UP AND TAP-DOWN.

An Electronic Controller and Electric Motor are contained 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 the throttle position in order to maintain the desired cruise speed. The Cruise Control Module contains a Low Speed Limit which will prevent engagement below a minimum speed (approximately 25 mph). The Cruise Control is in Standby Disabled Mode until all conditions inconsistent with Cruise Control operations are cleared. With the Ignition Switch in RUN, battery voltage is applied to terminal F of the Cruise Control Module. When the Slider Switch is moved to the ON position, battery voltage is applied to terminal A of the Cruise Control Module. If the Brake Pedal is at the rest position (Brakes not applied), battery voltage is present at module terminal D. If the Brake Pedal is applied, battery voltage is present at module terminal G. The 510 ohm CHMSL resistor is used to merely control the intensity of the CHMSL. When the Slider Switch is moved to the RESUME/ACCEL position, battery voltage is applied to terminal C of the Cruise Control Module. When the Slider Switch is moved to the SET/COAST position, battery voltage is applied to terminal B of the Cruise Control Module. Ground is at terminal E of the Cruise Control Module. Terminal J is used to signal the Vehicle Control Module (VCM) when the Cruise Control is engaged.