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 driver presses the normally closed
cancel switch, the cruise control cancel signal circuit opens. The BCM
then sends a class 2 message to the PCM to inhibit cruise control operation.
The vehicle speed stored in the memory of the cruise module will be lost. 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 depressed, battery voltage is applied
to terminal C of the module. When the SET/COAST 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 between a high of 5 volts and a
low of 0.5 volts. 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 the cruise control is engaged,
the PCM will command the IP cluster to light the CRUISE indicator via CKT 1807.
Refer to Computer System Diagnosis in Body Control System for CRUISE indicator
diagnosis. 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. |
| • | The CRUISE CANCEL button is depressed. |
| • | The park brake is engaged. |
| • | The LOW BRAKE FLUID indicator is illuminated. |
