Part 3

OPERATION

OVERDRIVE OFF INDICATOR

The OverDrive (OD) OFF indicator gives an indication to the vehicle operator when the OFF mode of the OD OFF switch has been selected, disabling the electronically controlled overdrive feature of the automatic transmission. This indicator is controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the Powertrain Control Module (PCM) or the Transmission Control Module (TCM) over the Controller Area Network (CAN) data bus.

The OD OFF indicator Light Emitting Diode (LED) is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch status is anything except ON or START. The LED only illuminates when it is provided a path to ground by the IC transistor.

The IC will turn ON the OD OFF indicator for the following reasons:

- OD OFF Indicator Bulb Test - Each time the ignition switch status transitions to ON, the IC illuminates the OD OFF indicator for about three seconds as a bulb test.
- OD OFF Indicator Lamp-On Message - Each time the IC receives an electronic OD OFF indicator lamp-ON message from the PCM or the TCM indicating that the OFF mode of the OD OFF switch has been selected, the indicator will be illuminated. The indicator remains illuminated until the IC receives a lamp-OFF message from the PCM or the TCM, or until the ignition switch status transitions to OFF, whichever occurs first.

The PCM or the TCM continually monitors the OD OFF switch to determine the proper outputs to the automatic transmission. The PCM or the TCM then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the transmission control system, the PCM, the TCM, the IC, the CAN data bus or the electronic communication related to OD OFF indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

REMOTE START INDICATOR

The remote start indicator gives an indication to the vehicle operator of the remote start system status. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received over the CAN data bus from the BCM and the Radio Frequency Hub (RF Hub).

The remote start indicator function of the electronic display unit is completely controlled by the IC logic circuit, and that logic will allow this indicator to operate whenever the IC receives a battery current input on the fused B(+) circuit. Therefore, the remote start indications can be illuminated regardless of the ignition switch status. The IC will turn ON the remote start indicator for the following reasons:

- Remote Start Active Messages - Each time the IC receives an electronicremote start active message from the BCM, the REMOTE START ACTIVE - PUSH START BUTTON textual message is displayed. The message is displayed while the current remote start event remains active (about 15 minutes), until the IC arbitrator logic determines that another display request has priority, or until the ignition switch status transitions to ON, whichever occurs first.
- Remote Start Abort Messages - Each time the IC receives a combination of electronic remote start abort and door ajar, hood ajar, liftgate ajar or low fuel messages from the BCM the REMOTE START ABORTED and appropriate DOOR AJAR, HOOD AJAR, LIFTGATE AJAR or FUEL LOWtextual messages are displayed. The messages are displayed while the current remote start event remains active (about 15 minutes), until the IC arbitrator logic determines that another display request has priority, or until the ignition switch status transitions to ON, whichever occurs first.
- Remote Start Disabled Messages - Each time the IC receives an electronic remote start disabled message from the BCM the REMOTE START DISABLED - START VEHICLE TO RESET textual message is displayed. The message is displayed while the current remote start event remains active (about 15 minutes), until the IC arbitrator logic determines that another display request has priority, or until the ignition switch status transitions to START, whichever occurs first.

The BCM continually monitors the remote start system inputs and the RF Hub to determine the proper outputs to the remote start components. The BCM then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the remote start system, the RF hub, the BCM, the IC, the CAN data bus or the electronic communication related to remote start indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

SEAT BELT INDICATOR

The seat belt indicator gives an indication to the vehicle operator of the status of the driver side front seat belt (export market vehicles) or driver and passenger front seat belts (domestic market vehicles). This indicator is controlled by a transistor on the IC circuit board based upon programming and electronic messages received over the CAN data bus from the ORC.

The seat belt indicator also includes a programmable enhanced seat belt reminder or BELTMINDER feature that is enabled when the vehicle is shipped from the factory. This BELTMINDER feature can be disabled and enabled by the customer using a specific programming event sequence, or by the dealer using a diagnostic scan tool.

The seat belt indicator LED is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch status is anything except ON or START. The LED only illuminates when it is provided a path to ground by the IC transistor. The IC will turn ON the seat belt indicator for the following reasons:

- Seat Belt Reminder Function - Each time the IC receives a battery current input on the fused ignition switch (run-start) circuit, the indicator will be illuminated as a seat belt reminder for about six seconds, or until the ignition switch status transitions to OFF, whichever occurs first. This reminder function will occur regardless of the status of the seat belt switch input to the ORC.
- Front Seat Belt Not Buckled - Beltminder Active - Following the seat belt reminder function, each time the IC receives an electronic seat belt indicator lamp-On message from the ORC while the ignition switch status is START or ON, the indicator will be illuminated. In addition, if the front seat belt remains unbuckled about 18 to 25 seconds after the conclusion of the seat belt reminder function with the vehicle speed greater than about 8 kilometers-per-hour (5 miles-per-hour), the seat belt indicator will begin to cycle between flashing ON and OFF for 3 seconds, then lighting solid for 2 seconds. The seat belt indicator will continue to cycle between flashing and solid illumination for 13 complete cycles, until the seat belt switch sense inputs to the ORC are closed circuits (seat belt switch closed = seat belt buckled), or until the ignition switch status transitions to OFF, whichever occurs first.
- Front Seat Belt Not Buckled - Beltminder Inactive - Following the seat belt reminder function, each time the IC receives an electronic seat belt indicator lamp-On message from the ORC while the ignition switch status is START or ON, the indicator will be illuminated. The indicator remains illuminated until the IC receives a lamp-OFF message from the ORC or until the ignition switch status transitions to OFF, whichever occurs first.

Each seat belt switch is connected in series between source current and a sense circuit from the ORC. The ORC continually monitors the seat belt switch circuits then sends the proper lamp-on or lamp-off messages to the IC. The seat belt switch inputs to the ORC may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. For proper diagnosis of the ORC, the IC, the CAN data bus or the electronic communication related to seat belt indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

SECURITY INDICATOR

The security indicator gives an indication to the vehicle operator when the Vehicle Theft Security System (VTSS) is arming or is armed. On vehicles equipped with the Sentry Key Immobilizer System (SKIS), the security indicator also gives an indication to the vehicle operator of the status of the SKIS. This indicator is controlled by a transistor on the IC circuit board based upon a hard wired input to the IC from the BCM and electronic messages received by the BCM from the RF hub over the CAN data bus. The BCM will illuminate the security indicator for about three seconds as a bulb test each time the ignition switch status transitions to ON.

The security indicator LED is completely controlled by the BCM logic circuit, and that logic will allow this indicator to operate whenever the BCM receives a battery current input on the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch status. The LED only illuminates when it is provided a path to ground by the BCM. Depending upon the programmed condition the indicator can be illuminated solid, flashed at a slow rate (0.5 Hertz, 12.5 percent duty cycle), or flashed at a fast rate (1 Hertz, 50 percent duty cycle). The IC will turn ON the security indicator for the following reasons:

- VTSS Indication - During the 16 second VTSS arming function, the BCM will flash the security indicator ON and OFF repeatedly at a steady, fast rate to indicate that the VTSS is in the process of arming. Following successful VTSS arming, the BCM flashes the security indicator ON and OFF continuously at a slower rate to indicate that the VTSS is armed. The security indicator continues flashing at the slower rate until the VTSS is disarmed or triggered. If the VTSS has alarmed and rearmed, the BCM will flash the security indicator at a steady, slow rate for about 30 seconds after the VTSS is disarmed.
- SKIS Indicator Lamp-On Message - Each time the BCM receives an electronic SKIS indicator lamp-ON message from the RF hub, the security indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the RF hub message. The indicator remains illuminated solid or continues to flash until the BCM receives a lamp-OFF message from the RF hub, or until the ignition switch status transitions to OFF, whichever occurs first. For more information on the SKIS and the security indicator control parameters, Vehicle Theft Security System - Operation.
- SKIS Textual Message - When the RF hub detects certain monitored conditions or is placed in the programming mode it will send electronic messages requesting the IC display textual messages, and the appropriate textual message or combination of messages is illuminated in the electronic display unit. PROGRAMMING ACTIVE, NEW KEY PROGRAMMED, REMOTE KEY BATTERY LOW and SERVICE SECURITY KEY messages appear individually, while a KEY NOT PROGRAMMED message is followed by either a DAMAGED KEY, INVALID KEY or EXCEEDED KEY PROGRAM LIMIT message and an INVALID KEY message is followed by a TRY ALTERNATE KEY message. The textual messages related to key programming are active only on vehicles sold in markets where customer programming is an available feature of the SKIS.
- Communication Error - If the BCM receives no lamp-ON or lamp-OFF messages from the RF hub for 10 consecutive message cycles, the security indicator is illuminated by the BCM. The indicator remains controlled and illuminated by the BCM until a valid lamp-ON or lamp-OFF message is received from the RF hub.

The BCM circuitry controls the security indicator whenever the ignition switch status is OFF and the VTSS is arming, armed, or alarming. Whenever the ignition switch status is ON or START, RF hub performs a self-test to decide whether the SKIS is in good operating condition and whether a valid key is present within the vehicle. The RF hub then sends the proper lamp-ON or lamp-OFF message to the BCM. If the BCM flashes the security indicator when the ignition switch transitions to ON, or turns ON the security indicator solid after the bulb test, it indicates that a SKIS malfunction has occurred or that the SKIS is ineffective.

For proper diagnosis of the VTSS, the SKIS, the BCM, the RF hub, the IC, the CAN data bus or the electronic communication related to security indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

SPORT MODE INDICATOR

The sport mode indicator gives an indication to the vehicle operator when the sport mode of the virtual sport mode switch in the Integrated Center Stack (ICS) display has been selected, enabling the sport shift schedule of the electronically controlled automatic transmission (if equipped) and the sport suspension mode of the adaptive air suspension system (if equipped). This indicator is controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the Transmission Control Module (TCM) or the Air Suspension Control Module (ASCM) over the CAN data bus.

The sport mode indicator Light Emitting Diode (LED) is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch status is anything except ON or START. The LED only illuminates when it is provided a path to ground by the IC transistor.

The IC will turn ON the sport mode indicator for the following reasons:

- Sport Mode Indicator Lamp-On Message - Each time the IC receives an electronic sport mode indicator lamp-ON message from the TCM or the ASCM, the sport mode indicator will be illuminated. The indicator remains illuminated until the IC receives a lamp-OFF message from the TCM or the ASCM, or until the ignition switch status transitions to OFF, whichever occurs first.

The TCM and the ASCM continually monitor the virtual sport mode switch in the ICS display to determine the correct operating mode of these systems. The TCM and the ASCM then send the proper lamp-ON or lamp-OFF messages to the IC.

For proper diagnosis of the sport mode switch, the TCM, the ASCM, the IC, the CAN data bus or the electronic communication related to sport mode indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

TIRE PRESSURE MONITOR INDICATOR

The Tire Pressure Monitor (TPM) indicator gives an indication to the vehicle operator of the status of the TPM system. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received by the IC from the TPM module over the CAN data bus.

The TPM indicator Light Emitting Diode (LED) is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the LED will always be OFF when the ignition switch status is anything except ON or START. The LED only illuminates when it is provided a path to ground by the IC transistor.

The IC will turn ON the TPM indicator for the following reasons:

- Bulb Test - Each time the ignition switch status transitions to ON, the TPM module sends an electronic TPM indicator lamp-ON message to the IC to illuminate the TPM indicator for about three seconds as a bulb test.
- TPM Indicator Lamp-On Message - Each time the cluster receives an electronicTPM indicator lamp-ON message from the TPM module, the TPM indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the TPM module message. The indicator remains illuminated solid or continues to flash until the IC receives a lamp-OFF message from the TPM module, or until the ignition switch status transitions to OFF, whichever occurs first.
- TPM Pressure Indication - If the TPM module determines that the pressure of a tire is too low or too high, an icon representing an overhead view of the vehicle is displayed in the electronic display unit with the actual monitored pressure of each tire.
- Communication Error - If the IC receives no TPM lamp-ON or lamp-OFF messages from the TPM module for six consecutive seconds, the TPM indicator is illuminated by the IC. The indicator remains controlled and illuminated by the IC until a valid lamp-ON or lamp-OFF message is received from the TPM module.

The TPM module performs a self-test each time the ignition switch status transitions to ON to decide whether the TPM system is in good operating condition and whether the tire inflation pressures are too high or too low. The TPM module then sends the proper lamp-ON or lamp-OFF message to the IC. If the TPM module turns ON the TPM indicator after the bulb test, it indicates that the inflation pressure of a tire is too low or that a malfunction has occurred and the TPM system is ineffective.

For proper diagnosis of the TPM system, the TPM module, the IC, the CAN data bus or the electronic communication related to TPM indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

TRANSMISSION TEMPERATURE INDICATOR

The transmission over-temperature indicator gives an indication to the vehicle operator when the transmission fluid temperature is excessive, which may lead to accelerated transmission component wear or failure. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received over the CAN data bus from the TCM.

The transmission over-temperature indicator function of the electronic display unit is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the transmission over-temperature indication will always be OFF when the ignition switch status is anything except ON or START. The IC will turn ON the transmission over-temperature indicator for the following reasons:

- Trans Over-Temp Indicator Lamp-On Message - Each time the IC receives an electronic trans over-temp indicator lamp-ON message from the TCM indicating that the fluid temperature is too high, the transmission over-temperature indicator will be illuminated and a single chime tone is sounded. The indicator remains illuminated for about five seconds, until the IC receives a lamp-OFF message from the TCM, until the IC arbitrator logic determines that another display request has priority, or until the ignition switch status transitions to OFF, whichever occurs first. The chime tone feature will only repeat during the same ignition cycle if the indicator is cycled OFF and then ON again by the appropriate lamp-ON and lamp-OFF messages from the TCM.

The TCM continually monitors the transmission temperature sensor to determine the transmission operating condition. The TCM then sends the proper lamp-ON or lamp-OFF message to the IC. If the IC illuminates the transmission over-temperature indicator due to a high transmission oil temperature condition, it may indicate that the transmission or the transmission cooling system are being overloaded or that they require service.

For proper diagnosis of the transmission temperature sensor, the TCM, the IC, the CAN data bus or the electronic communication related to transmission over-temperature indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

TURN SIGNAL INDICATORS

The turn signal indicators give an indication to the vehicle operator that the turn signal (left or right indicator flashing) or hazard warning (both left and right indicators flashing) have been selected and are operating. These indicators are controlled by transistors on the IC cluster electronic circuit board based upon cluster programming and electronic messages received from the BCM over the CAN data bus.

Each turn signal indicator Light Emitting Diode (LED) unit is completely controlled by the IC logic circuit, and that logic will allow this indicator to operate whenever the IC receives a battery current input on the fused B(+) circuit. Therefore, each LED can be illuminated regardless of the ignition switch status. The LED only illuminates when it is provided a path to ground by the IC transistor. The IC will turn ON the turn signal indicators for the following reasons:

- Turn Signal Indicator Lamp-On Message - Each time the IC receives an electronic right or left turn signal indicator lamp-On message from the BCM over the CAN data bus, the appropriate turn signal indicator will be flashed on and off. The BCM messages to the IC also control the flash rate of the turn signal indicators, as well as the click rate of an electromechanical relay soldered onto the IC electronic circuit board that emulates the sound emitted by a conventional turn signal flasher. The turn signal indicators continue to flash on and off until the IC receives a lamp-OFF message from the BCM, or until the ignition switch status transitions to OFF, whichever occurs first.
- Hazard Warning Indicator Lamp-On Message - Each time the IC receives an electronic hazard warning indicator lamp-On message from the BCM over the CAN data bus, both turn signal indicators will be flashed on and off. The BCM messages to the IC also control the flash rate of the turn signal indicators, as well as the click rate of an electromechanical relay soldered onto the IC electronic circuit board that emulates the sound emitted by a conventional hazard warning flasher. The turn signal indicators continue to flash on and off until the IC receives a lamp-OFF message from the BCM.
- Turn Signal-On Textual Warning Message - When the BCM detects that a turn signal has been active continuously for 1.6 kilometers (1 mile) with the vehicle speed greater than 22 kilometers-per-hour (15 miles-per hour) a TURN SIGNAL ON textual message and flashing right or left turn signal icon will appear within the IC electronic display unit and a chime tone will be sounded.
- Lamp Out Mode - If the BCM detects an ineffective turn signal lamp or circuit, it increases the flash rate for the remaining operative turn signals and sends an electronic message to the IC. The IC then increases the flash rate of the turn signal indicators and the click rate of the electromechanical relay to provide an indication of the problem to the vehicle operator.

The IC continually monitors electronic messages from the BCM to determine the proper turn signal and hazard warning indicator operation.

For proper diagnosis of the turn signal and hazard warning system, the multi-function switch, the BCM, the IC, the CAN data bus or the electronic communication related to turn signal indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

WASHER FLUID INDICATOR

The washer fluid indicator gives an indication to the vehicle operator that the fluid level in the washer reservoir is low. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received from the BCM over the CAN data bus.

The washer fluid indicator function of the electronic display unit is completely controlled by the IC logic circuit, and that logic will only allow this indicator to operate when the IC receives a battery current input on the fused ignition output (run-start) circuit. Therefore, the washer fluid indication will always be OFF when the ignition switch status is anything except ON or START. The IC will turn ON the washer fluid indicator for the following reasons:

- Washer Fluid Indicator Lamp-On Message - Each time the IC receives an electronic washer fluid indicator lamp-ON message from the BCM indicating that a low washer fluid condition has been detected for 60 consecutive seconds, the washer fluid indicator is illuminated and a single chime tone is sounded. The indicator remains illuminated until the IC receives lamp-OFF messages for 60 consecutive seconds from the BCM, or until the ignition switch status transitions to OFF, whichever occurs first. The chime tone feature will only repeat during the same ignition cycle if the washer fluid indicator is cycled OFF and then ON again by the appropriate lamp-ON and lamp-OFF messages from the BCM.

The BCM continually monitors the washer fluid level switch in the washer reservoir to determine the level of the washer fluid. The BCM then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the washer fluid level switch, the BCM, the IC, the CAN data bus or the electronic communication related to washer fluid indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.