Cruise Control Circuit Description

Ignition positive voltage is supplied from the A/C cruise fuse to the cruise control module. The cruise control module ground is applied by G109. When the cruise control ON/OFF switch is turned to the ON position, ignition positive voltage is supplied to the cruise on/off terminal of the cruise control module. If the driver has not pressed the brake pedal or the clutch pedal, ignition positive voltage is supplied through the cruise control release (brake) switch and the cruise control (clutch) switch (if equipped), to the cruise cancel terminal of the cruise control module. When the driver presses the brake pedal, battery positive voltage is supplied from the stop/hazard fuse, through the closed stop lamp switch to the brake input terminal of the cruise control module. When pressing R/A (resume/accelerate) on the control switch, ignition positive voltage is applied to the resume/accelerate terminal of the cruise control module. When Set/Coast is pressed on the control switch, ignition positive voltage is applied to the set/coast 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 engaged output terminal sends a signal to the Powertrain Control Module (PCM) when the cruise control is engaged. The cruise control module cruise inhibit input terminal is a circuit used by the PCM to inhibit cruise control when conditions inconsistent with cruise operation are present.

The PCM will inhibit cruise control under the following conditions:
^ The vehicle speed is less than 40 km/h (25 mph) (25 mph).
^ PARK, REVERSE, NEUTRAL, or 1st gear is indicated by the transaxle range switch.
^ Low engine RPM is present.
^ High engine RPM (fuel cut-off) is present.
^ The vehicle speed is too high.
^ An over or undercharged battery voltage condition exists.
^ The antilock brake system/traction control system is active for more than 2 seconds.

If the PCM determines that any of the cruise control inhibit conditions are present, the PCM requests that the cruise control module disengage cruise control. The PCM accomplishes this request by opening the cruise inhibit output circuit. If the cruise engage output signal, sent by the cruise control module to the PCM, indicates that the cruise control is still engaged after the PCM has requested that cruise control disengage, the PCM sets a DTC.