The cruise control is a speed control system that maintains
a desired speed under normal driving conditions. Steep grades up or down may
cause variations in the selected speed. The electronic cruise control system
has the ability to perform the following functions:
The following components are contained in the cruise control module:
| • | An electronic controller |
The electronic controller performs the following functions:
| • | Monitors the vehicle speed |
| • | Operates the electric motor |
In response to the controller, the motor moves a connecting strap. The
connecting strap is attached to the cruise control cable. The cable moves
the throttle linkage in order to vary the throttle position. This action
is performed in order to maintain the desired cruise speed. The cruise control
module contains a low speed limit that prevents system engagement below a
minimum speed of approximately 40 km/h (25 mph). Mode control
switches on the steering wheel control the module. The cruise control is
in Standby/Disabled mode until all conditions inconsistent with cruise control
operation are cleared.
When the ignition switch is in the RUN position, battery voltage is
applied to terminal F of the cruise control module. When the On/Off
switch is pressed ON, battery voltage is applied to terminal A of
the cruise control module. When the brake pedal is not depressed, battery
voltage is present at module terminal D. When the brake pedal is depressed,
battery voltage is present at module terminal G.
When the Resume/Accel switch is moved to the RESUME/ACCEL position,
battery voltage is applied to terminal C of the module. When the SET
switch is depressed, battery voltage is present at module terminal B.
Cruise control module connector terminal K is the speed signal terminal.
During operation, voltage oscillates at 1.11 Hz per mile per hour.
Ground is at module terminal E. When the cruise control is engaged,
terminal J is used in order to signal the Powertrain Control Module
(PCM). The PCM then determines the correct shift pattern for the transmission.
When conditions not consistent with cruise operation are present, terminal H
is used by the PCM in order to inhibit the cruise control. The PCM inhibits
the cruise control under the following conditions:
| • | The automatic transaxle is in PARK or NEUTRAL. |
| • | The engine has a high RPM (fuel cut-off). |
| • | The vehicle is traveling at a high speed (fuel cut-off). |
| • | The PCM sets certain DTCs or other failure records. Refer to Engine
Controls Diagnostic System Check. |
When the PCM enables the cruise control, the PCM commands the Body Control
Module (BCM) through the class 2 serial data line in order to turn
ON the instrument cluster CRUISE indicator through the SPI serial data line.
Refer to
Cruise Control System Check
in Body Control System.
