Part 2

OPERATION (Continued)

CHARGING INDICATOR

The charging indicator gives an indication to the vehicle operator when the electrical system voltage is too low or too high. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received Powertrain Control Module (PCM) over the CAN data bus. The CCN will illuminate the charge indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The charging indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the charging indicator for the following reasons:

- Voltage Low Message - Each time the CCN receives a message from the PCM indicating the electrical system voltage is low (less than about 11.5 volts is a charge fail condition), the charging indicator will be illuminated. The indicator remains illuminated until a message from the PCM indicating the electrical system voltage is normal (greater than about 12.0 volts, but less than 16.0 volts) is received, or until the ignition switch is turned to the Off position, whichever occurs first.
- Voltage High Message - Each time the CCN receives a message from the PCM indicating the electrical system voltage is high (greater than about 16.0 volts), the charging indicator will be illuminated. The indicator remains illuminated until a message from the PCM indicating the electrical system voltage is normal (less than about 15.5 volts, but greater than 11.5 volts) is received, or until the ignition switch is turned to the Off position, whichever occurs first.

The PCM continually monitors the electrical system voltage to control the generator output. The PCM then sends the proper system voltage messages to the CCN. If the charging indicator is turned on due to a charge fail or voltage high condition, it may indicate that the charging system requires service.

ELECTRONIC THROTTLE CONTROL INDICATOR

The Electronic Throttle Control (ETC) indicator gives an indication to the vehicle operator when the ETC system is faulty or inoperative. The ETC indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus. The CCN will illuminate the ETC indicator for about fifteen seconds each time the ignition is turned to the ON position, during the bulb test.

The ETC indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will also turn on the ETC indicator for the following reasons:

- ETC Lamp-On Message - Each time the CCN receives a lamp-on message from the PCM, the ETC indicator will be illuminated. The indicator can be flashed on and off, or illuminated solid, as dictated by the PCM message. The indicator remains illuminated solid or continues to flash for about twelve seconds or until a lamp-off message from the PCM is received, whichever is longer. If the indicator is illuminated solid with the engine running the vehicle will usually remain drivable. If the indicator is flashing with the engine running the vehicle may require towing. A flashing indicator means the ETC system requires immediate service.

The PCM continually monitors the ETC system circuits and sensors to decide whether the system is in good operating condition. The PCM then sends the proper lamp-on or lamp-off messages to the CCN. If the PCM sends a lamp-on message after the bulb test, it indicates that the PCM has detected an ETC system malfunction and/or that the ETC system is inoperative. The PCM will store a DTC for any malfunction it detects. Each time the ETC indicator fails to illuminate due to an open or short in the CCN ETC indicator circuit, the CCN sends a message notifying the PCM of the condition and the CCN and the PCM will each store a DTC.

ENGINE TEMPERATURE INDICATOR

The engine temperature indicator gives an indication to the vehicle operator when the engine temperature gauge reading reflects a condition requiring immediate attention. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages received from the PCM over the CAN data bus. The CCN will illuminate the engine temperature indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The engine temperature indicator LED is completely controlled by the CCN logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any position except On or Start. The LED only illuminates when it is provided a path to ground by the CCN transistor. The engine temperature indicator will also be turned on for the following reasons:

- Engine Temperature High Message - Each time the CCN receives a message from the PCM indicating the engine coolant temperature is above about 252° F (122° C), the engine temperature indicator will be illuminated and a single chime tone is sounded. The indicator remains illuminated until a message from the PCM indicating that the engine coolant temperature is below about 246° F (119° C) is received, or until the ignition switch is turned to the Off position, whichever occurs first. The chime tone feature will only repeat during the same ignition cycle if the engine temperature indicator is cycled off and then on again by the appropriate engine temperature messages from the PCM.

The PCM continually monitors the engine coolant temperature sensor to determine the engine operating temperature. The PCM then sends the proper engine coolant temperature messages to the CCN. If the CCN turns on the engine temperature indicator due to a high engine temperature gauge reading, it may indicate that the engine or the engine cooling system requires service.

FOG LAMP INDICATOR

The fog lamp indicator gives an indication to the vehicle operator whenever the optional fog lamps are illuminated. This indicator is controlled by a transistor on the CCN circuit board based upon programming and electronic messages from the Total Integrated Power Module (TIPM) over the CAN data bus.

The fog lamp indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the fog lamp indicator for the following reasons:

- Fog Lamp-On Message - Each time the CCN receives a fog lamp-on message from the TIPM indicating the fog lamp relay is energized, the fog lamp indicator will be illuminated. The indicator remains illuminated until the cluster receives a fog lamp-off message from the TIPM.

The CCN continually monitors a hard-wired input from the headlamp switch to determine the selected fog lamp switch status. The CCN then sends the proper fog lamp-on and lamp-off messages to the TIPM over the CAN data bus. The TIPM activates the fog lamp relay then sends the proper fog lamp indicator lamp-on and lamp-off messages to the CCN.

FUEL SAVER INDICATOR - ECONOMIZER (ECO / ECO-ON)

The ECO message will display next to the outside temperature in the EVIC display. The message will appear whenever the vehicle is driven in a fuel efficient manner, if the feature is turned ON using the customer programmable feature within the EVIC display menu.

On base model vehicle, an ECO or ECO-on message will be displayed within the odometer display when selected by the vehicle operator. The fuel saver feature can be selected by pressing the odometer push-button and toggling through the menu.

This feature allows the vehicle operator to monitor when they are driving in a fuel efficient manner, and it can be used to modify driving habits in order to increase fuel economy.

HIGH BEAM INDICATOR

The high beam indicator gives an indication to the vehicle operator whenever the headlamp high beams are illuminated. The TIPM sends a data Bus message for high beam indicator illumination, in turn the CCN takes this data Bus message directive to turn on the indicator.

The high beam indicator LED is completely controlled by the CCN logic circuit, and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the CCN transistor. The CCN will turn on the high beam indicator for the following reasons:

- High Beam Headlamps-On Input - Each time the CCN detects a high beam headlamps-on input from the headlamp beam select switch circuitry of the multi-function switch on the washer/beam select switch mux circuit, the headlamp high beams and the high beam indicator will be illuminated. The headlamp high beams and the high beam indicator remain illuminated until the CCN receives a high beam headlamps-off input from the multi-function switch, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever occurs first.

The CCN continually monitors the headlamp switch and the multi-function switch to determine the proper headlamp low beam and high beam control. The CCN then sends the proper low beam and high beam lamp-on and lamp-off messages to the TIPM over the CAN data bus and turns the high beam indicator on or off accordingly.