Part 3

LOW OIL PRESSURE INDICATOR

The low oil pressure indicator gives an indication to the vehicle operator when the engine oil pressure reading reflects a condition requiring immediate attention. This indicator 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 low oil pressure 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 low oil pressure indicator for the following reasons:

- Engine Oil Pressure Low Message - Each time the IC receives an electronic engine oil pressure message from the PCM indicating the pressure is about 6.9 kPa (1 psi) or lower, the low oil pressure 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 flashing until the IC receives a message from the PCM indicating that the pressure is above about 6.9 kPa (1 psi), or until the ignition switch status transitions to OFF, whichever occurs first. The IC will only turn the indicator ON in response to low engine oil pressure if the engine speed is greater than zero.

The PCM continually monitors the engine oil pressure sensor to determine the engine oil pressure. The PCM then sends the proper messages to the IC. If the IC turns ON the indicator after the bulb test, it may indicate that the engine or the engine oiling system requires service.

For proper diagnosis of the engine oil pressure sensor, the PCM, the IC, the CAN data bus or the electronic communication related to low oil pressure indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

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, Emissions Control - Operation.
- 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.

POWER LIFTGATE INDICATOR

The power liftgate indicator gives an indication to the vehicle operator of the power liftgate system status or when the system has been automatically disabled. This indicator is controlled by the IC logic circuit based upon programming and electronic messages received over the CAN data bus from the Power Liftgate Module (PLGM).

The power liftgate 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 power liftgate indications can be displayed regardless of the ignition switch status. The IC will turn ON the power liftgate indicator for the following reasons:

- Unlock To Operate Message - Each time the IC receives an electronic unlock to operate message from the PLGM, the UNLOCK TO OPERATE textual message is displayed. The message is displayed for about three seconds or until the IC arbitrator logic determines that another display request has priority, whichever occurs first.
- Put In Park To Operate Message - Each time the IC receives an electronic put in PARK to operate message from the PLGM, the PUT IN PARK TO OPERATE textual message is displayed. The message is displayed for about three seconds or until the IC arbitrator logic determines that another display request has priority, whichever occurs first.
- Function Disabled Message - Each time the IC receives an electronic function disabled message from the PLGM, the FUNCTION DISABLED textual message is displayed. The message is displayed for about three seconds or until the IC arbitrator logic determines that another display request has priority, whichever occurs first.
- Obstacle Detected Message - Each time the IC receives an electronic obstacle detected message from the PLGM, the OBSTACLE DETECTED textual message is displayed. The message is displayed for about three seconds or until the IC arbitrator logic determines that another display request has priority, whichever occurs first.
- Manually Close To Operate Message - Each time the IC receives an electronic manually close to operate message from the PLGM, the MANUAL CLOSE TO OPERATE textual message is displayed. The message is displayed for about three seconds or until the IC arbitrator logic determines that another display request has priority, whichever occurs first.

The PLGM continually monitors the power liftgate circuits and sensors to determine the proper outputs to the power liftgate components. The PLGM then sends the proper lamp-ON or lamp-OFF message to the IC.

For proper diagnosis of the power liftgate, the PLGM, the IC, the CAN data bus or the electronic communication related to power liftgate 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.