What does the PCM do when cruise control is engaged?
The PCM sends a class 2 message to the BCM that the cruise control is engaged. The BCM sends a message to the instrument panel cluster (IPC) to illuminate the cruise indicator if equipped. The PCM inhibits cruise control when. The vehicle speed is less than 40 km/h (25 mph).
What is the function of the cruise control module?
The cruise control module, cruise engaged 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.
What do you do if your Cruise Control is not working?
You can increase or decrease cruise speed by tapping a button or lever, and you can cancel cruise control by hitting the “Cancel” or “Off” buttons or stepping on the brake. This electronically-controlled throttle body is modulated directly by the engine control module, both for direct driver input and cruise control.
What does the are / a on the cruise control switch do?
When pressing the R/A (resume/accelerate) 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).
Which is cruise control signal does the PCM output?
PCM: In production vehicles, the PCM is used to output a 4,000-pulseper- mile VSS signal to the cruise control module. This is a common pulse count used with many early GM ECMs and VSS buffer boxes. An optional cruise engaged status signal is available for communication between the PCM and cruise control module.
When do you disengage the cruise control module?
Disengaging Cruise Control: The cruise control module retains the set vehicle speed in its memory until it loses 12V power through the cruise control on/off switch or the vehicle’s ignition switch.
Where is the cruise control wiring harness located?
A wiring harness comes in a kit which is used to install cruise control in a car which is not equipped with it. It needs to go below the dashboard to the servo and next to the powertrain control module (PCM) which is installed into the factory connector. The PCM can be found under the hood, at the firewall, below the master cylinder.
How does a cruise control system work on a car?
Electronic throttle systems use a TAC module (right), while cable throttle systems use a cable-driven cruise control module (left). The TAC module is wired to a motor mounted within the throttle body assembly and uses PCM data to change throttle angle to maintain cruise control vehicle speed.