Speed Control - Description

DESCRIPTION

Two electronic speed control systems are available factory-installed equipment on this vehicle: a conventional system and an adaptive system. Additional details of these two systems and their components can be found under the subheadings and paragraphs that follow.

CONVENTIONAL SPEED CONTROL

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

- Antilock Brake Module - An Antilock Brake Module (ABM) (also known as Controller Antilock Brake/CAB or the Electronic Stability Control/ESC module) is located on the antilock brake Hydraulic Control Unit (HCU) in the engine compartment. Anti-Lock Brake System Module - 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. Stop Lamp Switch - Description.
- ElectroMechanical Instrument Cluster - A CRUISE indicator is located in the fixed segment display of the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) that provides an indication to the vehicle operator when the speed control system is turned ON. Instrument Cluster - Description.
- Powertrain Control Module - The Powertrain Control Module (PCM) located on the Totally Integrated Power Module (TIPM) in the right front corner of 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. Powertrain Control Module - Description.
- Speed Control Switches - A speed control switch pod containing four momentary switch push buttons is located in the right horizontal spoke of the steering wheel.
- Steering Control Module - A Steering Control Module (SCM) is integral to the Steering Column Control Module (SCCM) located at the top of the steering column just below the steering wheel. Steering Column Module - Description.
- Wheel Speed Sensors - A wheel speed sensor is located on the knuckle of each front and rear wheel. Front.

The ABM, the EMIC, the PCM and the SCM each contain a microprocessor 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 SCM to relay the status of the speed control switches to the PCM, and by the PCM for control of the CRUISE indicator in the EMIC. 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 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.

ADAPTIVE SPEED CONTROL

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

- Adaptive Speed Control Sensor - An adaptive speed control sensor (also known as the Adaptive Cruise Control/ACC sensor or module and the radar sensor or module) is located on a bracket secured near the center of the underside of the front bumper support member of the Front End Module (FEM) behind the front fascia. Adaptive Speed Control Sensor And Bracket - Description.
- Antilock Brake Module - An Antilock Brake Module (ABM) (also known as Controller Antilock Brake/CAB or the Electronic Stability Control/ESC module) is located on the antilock brake Hydraulic Control Unit (HCU) in the engine compartment. Anti-Lock Brake System Module - 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. Stop Lamp Switch - Description.
- ElectroMechanical Instrument Cluster - A CRUISE indicator is located in the fixed segment display of the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) that provides an indication to the vehicle operator when the speed control system is turned ON. Instrument Cluster - Description.
- Electronic Vehicle Information Center - The Electronic Vehicle Information Center (EVIC) is located in the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) and provides an interface to the vehicle operator for setting the adaptive speed control customer preferences as well as a display of the adaptive speed control and Forward Collision Warning (FCW) system status messages. Electronic Vehicle Information Center - Description.
- Powertrain Control Module - The Powertrain Control Module (PCM) located on the Totally Integrated Power Module (TIPM) in the right front corner of 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. Powertrain Control Module - Description.
- Speed Control Switches - A speed control switch pod containing six momentary switch push buttons is located in the right horizontal spoke of the steering wheel.
- Steering Control Module - A Steering Control Module (SCM) is integral to the Steering Column Control Module (SCCM) located at the top of the steering column just below the steering wheel. Steering Column Module - Description.
- Wheel Speed Sensors - A wheel speed sensor is located on the knuckle of each front and rear wheel. Front.

The ACC sensor, the ABM, the EMIC, the EVIC, the PCM and the SCM each contain a microprocessor 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 ACC sensor to provide inputs to the ABM, the EVIC and the PCM, is used by the ABM to provide inputs to the PCM, is used by the SCM to relay the status of the speed control switches to the PCM and is used by the PCM for control of the indicators in the EMIC and the indications in the EVIC. Communication - Description.

Hard wired circuitry connects the adaptive 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.