Vehicle Systems Support: Notes

Besides typical instrument cluster gauge and indicator support, the electronic functions and features that the CCN supports or controls include the following:

• A/C Select and Evaporator Probe Support  - The CCN monitors hard wired inputs from the A/C select switch and evaporator temperature sensor inputs, then transmits electronic A/C clutch request  messages over the CAN data bus when appropriate to support the A/C clutch control feature.
• Audible Warnings  - The CCN electronic circuit board is equipped with an audible tone transducer and programming that allows it to provide various audible alerts to the vehicle operator. These alerts include single chime tones and continuous slow or fast tones. An electromechanical relay is also soldered onto the circuit board to produce audible clicks that are used to emulate the sound of a conventional turn signal or hazard warning flasher.
• Compass Mini-Trip Computer Display Support  - The CCN provides support for each of the functions and features of the Compass-Mini-Trip Computer (CMTC) display. This includes support for the compass, thermometer, trip computer and the switch inputs that are used to control and configure many of the displays. This also includes display arbitrator programming, which controls the priorities, sequences, and transition of information that is displayed in the CMTC display, particularly when multiple display requests are received simultaneously.
• Electric Backlight Support  - The CCN monitors Electric Backlight (EBL) switch hard wired inputs from the air conditioner-heater control, then transmits the appropriate electronic EBL request  messages over the CAN data bus to support the EBL function.
• Enhanced Accident Response Support  - The CCN monitors inputs from the Occupant Restraint Controller (ORC) and the Powertrain Control Module (PCM) to automatically turn ON the interior lighting after an airbag deployment event, 10 seconds after the vehicle speed is zero. The interior lighting remains illuminated until the key is removed from the ignition switch lock cylinder, at which time the interior lighting returns to normal operation and control. These Enhanced Accident Response System (EARS) features are each dependent upon a functional vehicle electrical system following the vehicle impact event.
• Exterior Lighting Switch Support  - The CCN monitors electronic exterior lighting switch  , and turn signal switch status  messages from the Steering Control Module (SCM) on the steering column over the LIN data bus and transmits the appropriate electronic exterior lighting  and turn signal request  messages to the Totally Integrated Power Module (TIPM) over the CAN data bus to support the exterior lighting functions.
• Four Wheel Drive (4WD) Lock Switch Support  - The CCN monitors a hard wired input from the 4WD Lock switch on the center floor console then transmits the appropriate electronic 4WD Lock request  and Unlock request  messages to the Totally Integrated Power Module (TIPM) over the CAN data bus to support the 4WD Lock mode functions.
• Horn Switch Support  - The CCN receives a hard wired input from the horn switch on the steering wheel then provides electronic horn request  messages over the CAN data bus to support the horn function.
• Interior Lamp Load Shedding  - The CCN provides a battery saver feature which will automatically turn OFF all interior lamps if they remain ON after a timed interval of about ten minutes.
• Interior Lighting Control  - The CCN monitors electronic messages and hard wired inputs from the interior lighting switch, the door ajar switches, the liftgate ajar switch, the reading lamp switches, and the Wireless Control Module (WCM) to provide courtesy lamp control. This includes support for timed illuminated entry with theater-style fade-to-OFF and courtesy illumination DEFEAT features.
• Local Interface Network Master Module  - The CCN is the master module for the LIN data bus. In this role it gathers information from the compass sensor, the Heated Seat Module (HSM), the instrument panel switch pod and the SCM, then either acts on that information directly or places electronic messages on the CAN data bus for use by other modules
• Panel Lamps Dimming Control  - The CCN monitors electronic dimming level  messages received from the panel lamps dimmer switch input to the SCM over the LIN data bus, then provides both a hard wired 12-volt Pulse-Width Modulated (PWM) output and electronic message outputs over the LIN data bus that synchronizes the dimming level of all panel lamps dimmer controlled lamps with that of the cluster general illumination lighting.
• Wiper and Washer Switch Support  - The CCN monitors electronic wiper switch  and washer switch status  messages from the SCM on the steering column over the LIN data bus and transmits the appropriate electronic wiper  and washer request  messages to the TIPM over the CAN data bus to support the wiper and washer system functions, including the headlamps-on with wipers programmable feature.