Part 4

OPERATION

SEAT BELT INDICATOR

The seatbelt indicator gives an indication to the vehicle operator of the status of the driver side front seat belt. This indicator is controlled by a transistor on the IC circuit board based upon programming and a hard-wired input from the seatbelt switch in the driver side front seat belt buckle through the seat belt switch sense circuit.

The seatbelt indicator also includes a programmable enhanced seatbelt 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 seatbelt 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 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 IC transistor. The IC will turn ON the seatbelt indicator for the following reasons:

- Seatbelt Reminder Function - Each time the cluster receives a battery current input on the fused ignition switch output (run-start) circuit, the indicator will be illuminated as a seatbelt reminder for about six seconds, or until the ignition switch is turned to the OFF position, whichever occurs first. This reminder function will occur regardless of the status of the seatbelt switch input to the cluster.
- Front Seatbelt Not Buckled - Beltminder Active - Following the seatbelt reminder function, each time the cluster detects an open circuit on either of the front seat belt switch sense circuit (seatbelt switch open = seatbelt unbuckled) with the ignition switch in the START or ON positions, the indicator will be illuminated. In addition, if the front seat belt remains unbuckled about 60 seconds after the conclusion of the seatbelt reminder function with the vehicle speed greater than about 8 kilometers-per-hour (5 miles-per-hour), the seatbelt indicator will begin to cycle between flashing ON and OFF for 3 seconds, then lighting solid for 2 seconds. The seatbelt indicator will continue to cycle between flashing and solid illumination for 13 complete cycles, until the seat belt switch sense inputs to the cluster are closed circuits to ground (seatbelt switch closed = seatbelt buckled), or until the ignition switch is turned to the OFF position, whichever occurs first.
- Front Seatbelt Not Buckled - Beltminder Inactive - Following the seatbelt reminder function, each time the cluster detects an open circuit on the seat belt switch sense circuit (seatbelt switch open = seatbelt unbuckled) with the ignition switch in the START or ON positions, the indicator will be illuminated. The seatbelt indicator remains illuminated until the seat belt indicator driver input to the cluster is a closed circuit to ground (seatbelt switch closed = seatbelt buckled), or until the ignition switch is turned to the OFF position, whichever occurs first.

The seatbelt switch is connected in series between ground and the seat belt switch sense circuit input to the IC. The seatbelt switch input to the IC circuitry may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. For proper diagnosis of the IC, the CAN data bus or the electronic communication related to seatbelt 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 programming, hard-wired inputs to the cluster from the various security system components, and electronic messages received by the cluster from the Wireless Ignition Node (WIN) over the CAN data bus. The IC will illuminate the security indicator for about three seconds each time the ignition is turned to the ON position, during the bulb test.

The security indicator LED 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 LED can be illuminated regardless of the ignition switch position. The LED only illuminates when it is provided a path to ground by the IC transistor. 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 cluster 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 cluster 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 cluster 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 cluster receives an electronic SKIS indicator lamp-ON message from the WIN, the security indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the WIN message. The indicator remains illuminated solid or continues to flash until the cluster receives a lamp-OFF message from the WIN, or until the ignition switch is turned to the OFF position, whichever occurs first.
- SKIS Textual Message - When the WIN detects certain monitored conditions or is placed in the programming mode it will send electronic messages requesting the cluster display textual messages, and the appropriate textual message or combination of messages is illuminated in the cluster re-configurable dot matrix display. 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 cluster receives no lamp-ON or lamp-OFF messages from the WIN for 10 consecutive message cycles, the security indicator is illuminated by the IC. The indicator remains controlled and illuminated by the cluster until a valid lamp-ON or lamp-OFF message is received from the WIN.

The IC circuitry controls the security indicator whenever the ignition switch is in the OFF position and the VTSS is arming, armed, or alarming. Whenever the ignition switch is in the ON or START positions, the WIN performs a self-test to decide whether the SKIS is in good operating condition and whether a valid key is present in the ignition lock cylinder. The WIN then sends the proper lamp-ON or lamp-OFF message to the IC. If the cluster flashes the security indicator upon ignition 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 WIN, 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.

SERVICE COLUMN LOCK INDICATOR

The service column lock indicator gives an indication to the vehicle operator when the Wireless Ignition Node (WIN) has recorded a DTC for a steering column shaft lock module circuit or component malfunction. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received by the cluster from the WIN over the CAN data bus.

The service column lock indicator function of the LCD 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 switch output (run-start) circuit. Therefore, the LCD service column lock indication will always be OFF when the ignition switch is in any position except ON or START. The IC will turn ON the service column lock indicator for the following reasons:

- Service Column Lock Indicator Lamp-On Message - Each time the cluster receives an electronic service column lock indicator lamp-ON message from the WIN, the service column lock indicator will be illuminated. The indicator remains illuminated for about five seconds, until the cluster receives a lamp-OFF message from the WIN, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.

The WIN continually monitors the steering column shaft lock module circuits and components to determine the condition of the system. The WIN then sends the proper lamp-ON or lamp-OFF message to the IC.

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

TRACTION CONTROL INDICATOR

The traction control indicator gives an indication to the vehicle operator when the ESC/BAS/Traction Control System (TCS) has been activated. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received by the cluster from the CAB over the CAN data bus. The IC will illuminate the traction control indicator for about four seconds each time the ignition is turned to the ON position, during the bulb test.

The traction control indicator 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 switch output (run-start) circuit. Therefore, the indicator will always be OFF when the ignition switch is in any position except ON or START. The indicator only illuminates when it is provided a path to ground by the IC circuitry. The IC will turn ON the traction control indicator for the following reasons:

- Traction Control Indicator Lamp-On Message - Each time the cluster receives an electronic traction control indicator lamp-ON message from the CAB indicating that the ESC/BAS/TCS has been activated, the traction control indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the CAB message. The indicator remains illuminated solid or continues to flash until the cluster receives a lamp-OFF message from the CAB, or until the ignition switch is turned to the OFF position, whichever occurs first.

The CAB continually monitors the traction control switch to determine the proper outputs to the components of the Antilock Brake System (ABS). The CAB then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the traction control switch, the ESC/BAS/TCS, the CAB, the IC, the CAN data bus or the electronic communication related to traction control 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 BCM.

The transmission over-temperature indicator function of the LCD 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 switch output (run-start) circuit. Therefore, the LCD transmission over-temperature indication will always be OFF when the ignition switch is in any position 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 cluster receives an electronic trans over-temp indicator lamp-ON message from the BCM indicating that the fluid temperature is 135 °C (275 °F) or higher, 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 cluster receives a lamp-OFF message from the BCM, until the cluster arbitrator logic determines that another display request has priority, 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 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 transmission temperature sensor to determine the transmission operating condition. The BCM 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 BCM, 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 electronic circuit board based upon the programming and electronic messages received from the BCM over the CAN data bus.

Each turn signal indicator LED 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 position. 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 cluster receives an electronic right or left turn signal-ON message from the BCM over the CAN data bus, the appropriate turn signal indicator will be flashed ON and OFF. The BCM also sends the appropriate electronic message to the IC to control the flash rate of the turn signal indicators, as well as to control 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 is turned to the OFF position, whichever occurs first.
- Hazard Warning Indicator Lamp-On Message - Each time the cluster receives an electronic hazard warning-ON message from the BCM over the CAN data bus, both turn signal indicators will be flashed ON and OFF. The BCM also sends the appropriate electronic messages to the IC to control the flash rate of the right and left turn signal indicators, as well as to control the click rate of an electromechanical relay soldered onto the cluster 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 cluster receives a hazard warning-OFF message from the BCM.
- Turn Signal-On Textual Warning Message - When the cluster 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 re-configurable dot matrix display 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 the 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 LCD 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 switch output (run-start) circuit. Therefore, the LCD washer fluid indication will always be OFF when the ignition switch is in any position 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 cluster 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 cluster receives lamp-OFF messages for 60 consecutive seconds from the BCM, 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 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.

The hard-wired indicator inputs may be diagnosed using conventional diagnostic tools and procedures. However, the IC circuitry and electronic CAN or LIN data bus message controlled indicators are diagnosed using the self-diagnostic IC Self test. Testing and Inspection for more information. For proper testing of the CAN or LIN data bus and the electronic data bus message inputs to the IC that control each indicator requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.