Speed Control (Service Information): Description: Conventional

The standard equipment conventional electronic speed control system includes the following major components, which are described in further detail elsewhere in this service information:

• Anti-lock Brake System (ABS) Module  - The ABS is located on the anti-lock brake Hydraulic Control Unit (HCU) in the engine compartment. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM (ABS), DESCRIPTION .
• Brake Lamp Sensor  - The brake (stop) lamp sensor 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 (IPC)  - A CRUISE indicator is located in the fixed segment display of the IPC that provides an indication to the vehicle operator when the speed control system is turned ON. Refer to DESCRIPTION .
• Powertrain Control Module (PCM)  - The PCM is in the left front corner of the engine compartment attached to a bracket that is attached to the battery tray. The PCM 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 Switches  - A speed control Steering Wheel Switch (SWS) switch pod containing four momentary switch push buttons is located in the horizontal spoke of the steering wheel. Refer to SWITCH, SPEED CONTROL, DESCRIPTION .
• Steering Column Control Module (SCCM)  - The SCCM is located at the top of the steering column just below the steering wheel. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), DESCRIPTION .
• Wheel Speed Sensors  - A wheel speed sensor is located on the knuckle of each front and rear wheel. Refer to SENSOR, WHEEL SPEED, FRONT, DESCRIPTION .

The ABS, IPC, PCM and the SCCM 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 SCCM 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 conventional 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 appropriate SYSTEM WIRING DIAGRAMS, pin out and location views for the various wire harness connectors, splices and grounds.