Circuit Operation

The Electro-Motor Cruise Control is a speed control system which maintains a desired vehicle speed under normal driving conditions. The system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, TAP-UP, TAP-DOWN AND CANCEL (Depress "SET" and "R/A" simultaneously).

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 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, about 25 mph. The module is controlled by mode control switches located on the Multi-Function Lever. The "Set To Get Cruise" feature requires the operator to set an initial speed by using the "Set/Coast" button before the "RESUME/ACCEL" Slider Switch would be active.

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. The Cruise Control Module needs to see Ignition Voltage at terminal "D" to change states once each

With the ignition cycle before allowing Cruise to operate. (Later production vehicles require Brake Input at either terminal "D" or "G").

On vehicles with Traction Control (NW9) the voltage path is through the "LOW TRAC" Indicator, the normally closed Clutch Start Switch (Manual Transmission only) and Brake Switch. On vehicles without Traction Control (NW9) the voltage path is through the A/C CRUISE Fuse 12, the normally closed Clutch Start Switch (Manual Transmission only) and Brake Switch. If either switch is opened the voltage to the Cruise Control Module terminal "D" is interrupted. With Traction Control (NW9) if a low traction condition occurs the Electronic Brake/Traction Control Module (EBTCM) will ground CKT 1537 causing a ground potential at terminal "D" of the Cruise Control Module disabling the Cruise Control. Terminal "C" must see a ground path through the CHMSL bulb for cruise to operate properly. If the brake pedal is depressed, battery voltage is present at module terminal "C". When the Slider Switch is moved to the "R/A" position, battery voltage is applied to terminal "C" of the module. With the Set Switch depressed, battery voltage is present at Cruise Module terminal "B". Cruise Module Connector terminal "K" is the speed signal terminal. In operation, voltage will oscillate between a high of 4 to 5 volts and a low of near ground. Cruise Module Connector terminals "H" and "J" are not used. Ground is at module terminal "E".