Cruise Control Description and Operation w/ ETC

Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades may cause variations in the selected speeds. The electronic cruise control system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and TAP-UP or TAP-DOWN.

The main parts of the cruise control system are:

The cruise control system uses the TAC module to maintain the desired vehicle cruise speed and operation. The TAC and the powertrain control module (PCM) communicate together to vary the throttle opening in each different cruise control mode. The PCM monitors vehicle speed and operates the throttle actuator. The throttle actuator operates in response to the TAC module, to maintain the desired cruise speed. The throttle actuator motor moves the throttle blade. The PCM assembly contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph). The TAC or PCM module assembly are not serviceable.

The operation of the cruise control is through the function control switches located on the multifunction turn signal lever. The cruise control function control switches includes the ON/OFF, SET/COAST, R/A . The switch assembly provides driver control of the cruise control system.

The multiple function stop lamp switch is used to disengage the cruise control. A cruise control release switch circuit and a stop lamp switch circuit are used. The stop lamp switch is mounted to the brake pedal bracket . To disengage the system the driver presses the brake pedal . The speed of the vehicle at brake actuation will be stored in the memory of the TAC module.

With cruise control, the vehicle can maintain a speed of about 40 km/h (25 mph) or more without keeping your foot on the accelerator. When the driver turns off the cruise control ON/OFF switch or ignition switch, the cruise control turns off. The vehicle speed stored in the memory of the TAC module will be lost.

Ignition positive voltage is supplied from the ETC fuse, to the TAC module. The TAC module is grounded to G103. When the cruise control ON/OFF switch is on, ignition positive voltage is applied to the cruise on switch signal terminal of the TAC module. If the driver has not pressed the brake pedal , ignition positive voltage is supplied through the switches, to the cruise control brake pedal switch signal terminals of the PCM. Cruise control is canceled when the driver presses the brake pedal . The stop lamp switch closes, applying battery positive voltage to the stop lamp signal circuit of the TAC module. Voltage is also removed from the brake pedal signal circuit at the PCM. When pressing the SET/COAST button on the multifunction turn signal lever, ignition positive voltage is applied to the set/coast switch signal terminal of the TAC module. When pressing the R/A on the control switch, ignition positive voltage is applied to the resume/accelerate switch signal terminal of the TAC module.

When the cruise switch is in the ON position, and the driver presses the SET/COAST button, the TAC module notifies the PCM that the cruise control is requested. The PCM then checks to see that the cruise control enable criteria is met. If the cruise control criteria has been met the PCM sends a class 2 message to the instrument panel cluster (IPC) to illuminate the cruise light, if equipped

The PCM will inhibit cruise control:

If the PCM determines that any of the cruise control inhibit conditions are present, the PCM will disengage the cruise control. The PCM accomplishes this through data communication with the TAC module. If the PCM disables the cruise control for an inhibiting event it will record the reason for disengagement in the Disengage Definition data file.

Cruise Control Description and Operation w/o ETC

Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions. However, steep grades may cause variations in the selected speeds. The electronic cruise control system has the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and TAP-UP or TAP-DOWN.

The main parts of the cruise control system are:

The cruise control system uses the cruise control module assembly to maintain the desired vehicle cruise speed and operation. The cruise control module assembly has an electronic controller and an electric stepper motor to vary the throttle in each different cruise control mode. The electric controller monitors vehicle speed and operates the electric stepper motor. The stepper motor operates in response to the electronic controller, to maintain the desired cruise speed. The electric stepper motor moves a strap that is attached to the cruise control cable which moves the throttle linkage. The cruise control module assembly contains a low speed limit which will prevent system engagement below a minimum speed of 40 km/h (25 mph). The module assembly is not serviceable.

The operation of the electronic controller is controlled by the function control switches located on the multifunction turn signal lever. The cruise control functional control switches include the ON/OFF, SET/COAST and R/A switch. The switch assembly provides driver control of the cruise control system.

The stop lamp switch controls both the cruise control release signal and stoplamp signal. These signal circuits are used to disengage the cruise control. The stop lamp switch assembly is mounted on the brake pedal bracket. To disengage the system electrically the driver presses the brake pedal. The speed of the vehicle at brake actuation will be stored in the memory of the cruise module.

With cruise control, you can maintain a speed of about 40 km/h (25 mph) or more without keeping your foot on the accelerator. When the driver turns off the on/off switch, or the ignition switch, the cruise control turns off. The vehicle speed stored in the memory of the cruise module will be lost.

Ignition positive voltage is supplied from the cruise fuse, to the cruise control module and cruise control switch. The cruise control module is grounded to the chassis. When the cruise control ON/OFF switch is on, ignition positive voltage is applied to the cruise on switch signal circuit of the cruise control module. If the driver has not pressed the brake pedal, ignition positive voltage is supplied through the cruise control release circuit, to the cruise control release signal terminal of the cruise control module. . When the driver presses the brake pedal, battery positive voltage is supplied from the stop lamp fuse, through the closed stop lamp switch to the stop lamp switch signal terminal of the cruise control module. As this operation occurs, ignition positive voltage is removed from the cruise release signal circuit. When the SET/COAST is pressed on the control switch, ignition positive voltage is applied to the set/coast switch signal terminal of the cruise control module. When pressing the R/A on the control switch, ignition positive voltage is applied to the resume/ accelerate switch signal terminal of the cruise control module.

The cruise control module receives a vehicle speed signal input from the Powertrain Control Module (PCM). In operation, the voltage varies between 0 V and 5 V.

The cruise control module, cruise indicator control terminal, sends a signal to the PCM when cruise is engaged. The cruise control module, cruise cancel signal terminal, is a circuit used by the PCM to inhibit cruise control when conditions inconsistent with cruise operation are present.

After the cruise control engage criteria has been met and the cruise ON and Set/Coast have been commanded, the cruise control module sends a signal to the PCM that the cruise control is engaged. The PCM then send a class 2 message to the instrument panel cluster (IPC) to illuminate the cruise light.

The PCM will inhibit cruise control:

If the PCM determines that any of the cruise control inhibit conditions are present, the PCM will disengage the cruise control. The PCM accomplishes this by opening the cruise control inhibit/enable signal circuit.