Section 286 (Speed Control (Service Information)): Description

WARNING: This page is about a different car, the 2017 RAM ProMaster 3500, 2017 RAM ProMaster 2500, and 2017 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.

An electronic speed control (also known as cruise control) system is standard factory-installed equipment on this vehicle. The electronic speed control system includes the following major components, which are described in further detail elsewhere in this service information:

Body Control Module - The Body Control Module (BCM) located in the passenger compartment receives the hard wired inputs from the cruise control switches and the stop lamp switch, then relays those inputs to the Powertrain Control Module (PCM) over the Controller Area Network (CAN) data bus. Refer to MODULE, BODY CONTROL (BCM), DESCRIPTION .
Brake Lamp Switch - The brake (also known as stop) lamp switch is located on the brake pedal support bracket under the driver side of the instrument panel. Refer to SWITCH, STOP LAMP, DESCRIPTION .
Instrument Panel Cluster - A CRUISE indicator is located in the Instrument Panel Cluster (IPC) that provides an indication to the vehicle operator when the speed control system is turned ON. Refer to DESCRIPTION .
Powertrain Control Module - The Powertrain Control Module (PCM) located in the engine compartment contains the software and hardware that monitors all of the speed control system inputs and controls all of the speed control system outputs. Refer to MODULE, POWERTRAIN CONTROL (PCM), DESCRIPTION .
Speed Control Switch Stalk - A speed control switch containing selectable speed control options is located in the stalk attached to the left side of the steering column.
Wheel Speed Sensors - A wheel speed sensor is located on the knuckle of each front and rear wheel. Refer to SENSOR, WHEEL SPEED, FRONT and SENSOR, WHEEL SPEED, REAR .

The BCM, the PCM and the IPC each contain a microcontroller and programming that allow them to communicate with each other using the Controller Area Network (CAN) data bus. This method of communication is used by the BCM to relay the status of the speed control switches to the PCM, and by the PCM for control of the CRUISE indicator in the IPC. Refer to COMMUNICATION, DESCRIPTION .

Hard wired circuitry connects the electronic speed control system components to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the speed control system components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.