Part 3

LOW TIRE PRESSURE 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 a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the Tire Pressure Module (TPM) (also known as the CORAX module) over the CAN data bus. The IC will illuminate the TPM indicator for about three seconds as a bulb test each time the ignition switch status transitions to ON.

The TPM 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 TPM indicator for the following reasons:

- TPM Indicator Lamp-On Message - Each time the IC receives an electronic TPM indicator lamp-ON message from the TPM, the TPM indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the TPM message. The indicator remains illuminated until the IC receives a lamp-OFF message from the TPM, or until the ignition switch status transitions to OFF position, whichever occurs first.
- TPM Textual Warning Message - When the TPM detects certain monitored fault conditions, it will send electronic messages requesting the IC display a textual warning message. Each time the IC receives an electronic textual warning request message from the TPM, a SERVICE TIRE PRESS. SYSTEM textual message will appear within the electronic display unit to accompany a flashing TPM indicator or to replace the TPM TIRE LOW PRESSURE textual message. This message indicates that the TPM has detected a problem in one of the TPM system components.
- TPM Low Pressure Message - On vehicles equipped with the optional premium version of the TPM system, each time the IC receives an electronic low pressure message from the TPM, a LEFT FRONT, RIGHT FRONT, LEFT REAR or RIGHT REAR LOW PRESSURE textual message will appear within the IC electronic display unit to accompany a solid TPM indicator. If the vehicle is equipped with a full-sized matching spare tire and wheel assembly, an electronic spare low pressure message from the TPM to the IC will cause a SPARE LOW PRESSURE textual message to appear in the electronic display unit, but the TPM indicator will not illuminate. This message indicates that the TPM has received a low tire pressure input from the tire pressure sensor in the identified location on the vehicle. The premium TPM system is not offered in markets where rear fog lamps are an available option.
- Communication Error - If the IC receives no TPM lamp-ON or lamp-OFF messages from the TPM 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.

The TPM 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 then sends the proper lamp-ON or lamp-OFF message to the IC. If the IC 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, 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.

MALFUNCTION INDICATOR LAMP

The Malfunction Indicator Lamp (MIL) gives an indication to the vehicle operator when the PCM has recorded a DTC for an On-Board Diagnostics II (OBDII) emissions-related circuit or component malfunction. The MIL is controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the PCM over the CAN data bus. The IC will illuminate the MIL indicator for about fifteen seconds as a bulb test each time the ignition switch status transitions to ON.

The MIL 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 MIL for the following reasons:

- MIL Lamp-On Message - Each time the IC receives an electronic MIL lamp-ON message from the PCM, the indicator will be illuminated. The indicator can be flashed ON and OFF, or illuminated solid, as dictated by the PCM message. For some DTCs, if a problem does not recur, the PCM will send a lamp-OFF message automatically. Other DTCs may require that a fault be repaired and the PCM be reset before a lamp-OFF message will be sent. For more information on the PCM, and the DTC set and reset parameters, Scan Tool Testing and Procedures.
- Communication Error - If the IC receives no lamp-ON or lamp-OFF messages from the PCM for 10 consecutive message cycles, the MIL is illuminated by the IC to indicate a loss of bus communication. The indicator remains controlled and illuminated by the IC until a valid message is received from the PCM.

The PCM continually monitors the fuel and emissions 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 message to the IC. If the IC turns ON the MIL after the bulb test, it may indicate that a malfunction has occurred and that the fuel and emissions systems require service.

For proper diagnosis of the fuel and emissions systems, the PCM, the IC, the CAN data bus or the electronic communication related to MIL operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

NO BUS INDICATOR

The no bus indicator gives an indication to the vehicle operator when the IC detects a loss of electronic communication over the CAN data bus. This indicator is controlled by the IC logic circuit based upon programming and electronic messages not being received over the CAN data bus from the BCM.

The no bus 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 no bus indication will always be OFF when the ignition switch status is anything except ON or START. The IC will turn ON the no bus indicator for the following reasons:

- No Electronic Communication Messages - Each time the ignition switch is turned to the ON position and the IC does not receive electronic communication messages over the CAN data bus, the no bus indicator is illuminated. The indicator remains illuminated until CAN bus communication is restored or until the ignition switch status transitions to OFF, whichever occurs first.

The IC continually monitors the CAN data bus to determine the status of many sensors and systems throughout the vehicle. If the IC detects the loss of CAN bus communication it illuminates the no bus indicator to alert the vehicle operator that it cannot provide accurate displays and outputs.

For proper diagnosis of the IC, the CAN data bus or the electronic communication related to no bus indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

POSITION LAMP INDICATOR

The position lamp indicator gives an indication to the vehicle operator whenever the position lamps are illuminated. This indicator is controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the BCM over the CAN data bus.

The position lamp 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 status. The LED only illuminates when it is provided a path to ground by the IC transistor. The IC will turn ON the position lamp indicator for the following reasons:

- Position Lamp Indicator Lamp-On Message - Each time the IC receives an electronic position lamp indicator lamp-ON message from the BCM indicating the position lamps are turned ON, the position lamp indicator will be illuminated. The indicator remains illuminated until the IC receives a lamp-OFF message from the BCM, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever occurs first.

The BCM continually monitors a hard wired input from the exterior lighting switch to determine the appropriate outputs to the park lamps. The BCM activates or deactivates the park lamps then sends the proper lamp-ON or lamp-OFF message to the IC to control the position lamp indicator.

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

REAR FOG LAMP INDICATOR

The rear fog lamp indicator gives an indication to the vehicle operator whenever the rear fog lamps are illuminated. This indicator is controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the BCM over the CAN data bus.

The rear fog lamp 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 status. The LED only illuminates when it is provided a path to ground by the IC transistor. The IC will turn ON the rear fog lamp indicator for the following reasons:

- Rear Fog Indicator Lamp-On Message - Each time the IC receives an electronic rear fog indicator lamp-ON message from the BCM indicating that the rear fog lamps are turned ON, the rear fog lamp indicator will be illuminated. The indicator remains illuminated until the IC receives a lamp-OFF message from the BCM, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever occurs first.

The BCM continually monitors a hard wired input from the exterior lighting switch to determine the appropriate outputs to the rear fog lamps. The BCM activates or deactivates the rear fog lamps then sends the proper lamp-ON or lamp-OFF message to the IC to control the rear fog lamp indicator.

For proper diagnosis of the rear fog lamp system, the BCM, the IC, the CAN data bus or the electronic communication related to rear fog lamp 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.