Instrument Panel Cluster (IPC) - System Operation and Component Description: Indicators
Auto Stop-Start Indicator (1.5L Or 2.0L Only)
The auto stop-start indicator informs the driver of the following states:
- solid green - the auto stop-start feature has temporarily turned off the engine.
- solid amber - a stop/start system concern exists.
- flash in either green or amber - system state as determined by the PCM.
The IPC receives the stop-start standby indication message from the BCM over the MS-CAN. The BCM receives the stop-start indication message from the PCM over the HS-CAN.
ABS Warning Indicator
The IPC receives the ABS warning indicator request message from the BCM. The BCM receives the ABS warning indicator request message from the ABS module. If a fault condition exists in the ABS, the ABS module sends the ABS warning indicator request message to either flash or illuminate the ABS warning indicator.
Airbag Warning Indicator
The IPC receives the airbag warning indicator request from the BCM. The BCM receives the airbag indicator request from the RCM. If a SRS concern is detected, the RCM sets a DTC and the IPC illuminates the airbag warning indicator.
Blind Spot Information System (BLIS®) Indicator
The IPC uses Blind Spot Information System (BLIS®) on, Blind Spot Information System (BLIS®) RH and LH status and trailer connected status messages to control the Blind Spot Information System (BLIS®) indicator. The IPC receives the Blind Spot Information System (BLIS®) on and Blind Spot Monitoring System (BLIS®) RH and LH status messages from the BCM over the MS-CAN. The IPC receives the trailer connected status message from the TRM over the MS-CAN.
When the Blind Spot Information System (BLIS®) is turned off by the driver or disabled by the Blind Spot Information System (BLIS®), the IPC turns off the Blind Spot Monitoring System (BLIS®) indicator.
Brake Warning Indicator
The IPC uses 3 basic messaged inputs to control the brake warning indicator. The first 2 messages are the brake (red) warning indicator request and parking brake status sent from the ABS module and the third is the brake fluid level low message request sent from the BCM.
The brake fluid level switch is hardwired to the BCM through a single signal circuit while using a separate ground to control the input.
The BCM provides reference voltage to the brake fluid level switch. When a low brake fluid level condition exists, the brake fluid level switch opens, sending the signal circuit high. If the brake fluid level switch is disconnected, the BCM reference voltage sent to the brake fluid level switch remains high and the brake fluid input is interpreted as low by the BCM.
When the BCM detects the brake fluid level signal low, the BCM sends the brake fluid level low request to the IPC over the MS-CAN.
When the ABS module detects an ABS brake concern or the parking brake is applied, the ABS module sends the brake (red) warning indicator request or the parking brake status message to the BCM over the HS-CAN. The BCM in turn sends the brake (red) warning indicator request or the parking brake status message to the IPC over the MS-CAN to illuminate the brake warning indicator.
If the brake fluid level drops and closes the brake fluid level switch, the BCM waits approximately 30 seconds before sending the IPC the brake fluid level low message to illuminate the brake warning indicator.
Charging System Warning Indicator
The IPC receives the charging system indicator request from the BCM. When a fault is detected in the charging system, the BCM sends the IPC the charging system indicator request to illuminate the charging system warning indicator.
Electronic Parking Brake Indicator
The electronic parking brake indicator indicates a fault in the electronic park brake system. The IPC receives the parking brake indicator request from the BCM over the MS-CAN. The BCM receives the parking brake indicator request from the ABS module over the HS-CAN.
Fog Lamp Indicator
When the fog lamps are turned on, the BCM sends a fog lamp indicator request to the IPC to illuminate the fog lamp indicator.
Grade Assist Indicator
The IPC receives the transmission shift mode message from the BCM. The BCM receives the transmission shift mode message from the PCM. When the grade assist function is selected on, the IPC illuminates the grade assist indicator.
High Beam Indicator
When the high beams are turned on, the BCM sends a headlamp high beam indicator request to the IPC to illuminate the high beam indicator.
Information Indicator
The information indicator illuminates when the IPC displays messages in the message center. Two different colors (red and amber) are used to indicate the nature of the message. If the message is an informational message, the indicator is displayed in amber. If the message is a warning, the indicator is displayed in red. The information indicator is also used in conjunction with the perimeter alarm system as a theft deterrent. When the perimeter alarm is armed, the IPC receives the alarm mode message from the BCM to flash the information indicator.
LH- RH Turn Signal Indicator
When the multifunction switch is in the LH or RH turn position or if the hazard switch is on, a turn indicator command message is sent to the IPC from the BCM. Upon receipt of the applicable turn signal on/off request, the IPC flashes the turn signal indicator on and off.
Lights On Indicator
When the parking lamps are turned on, the BCM sends the position light indication message to the IPC to illuminate the lights on indicator.
Low Fuel Indicator
The IPC uses the fuel level status message sent from the BCM to control the low fuel indicator. When the DTE is 80 km (50 miles) (with MyKey®) or 60 km (35 miles) (with an administrator key) the low fuel indicator illuminates.
Low Oil Pressure Warning Indicator
The engine oil pressure switch is hardwired to the PCM. The IPC receives the oil pressure warning message from the BCM. The BCM receives the oil pressure warning message from the PCM.
The PCM provides a reference voltage to the engine oil pressure switch when the ignition is in RUN.
With the engine running and low or no oil pressure, the engine oil pressure switch closes. The PCM detects the low reference voltage and the IPC illuminates the low oil pressure warning indicator.
With the engine running and sufficient oil pressure, the engine oil pressure switch opens, sending the reference voltage high. The PCM detects the high reference voltage and the IPC turns off the low oil pressure warning indicator.
MIL
The IPC receives the MIL request message from the BCM. The BCM receives the MIL request from the PCM.
PRNDL/SelectShift® Indicator
The IPC receives the transmission mode display and transmission gear display messages from the BCM. The BCM receives the transmission mode display actual and transmission gear display messages from the PCM. The IPC also uses a park position detect switch (part of the selector lever) input to signal the IPC that the shift lever is fully seated in the PARK (P) position. The IPC compares the park position detect switch input with the transmission mode display message sent from the PCM.
The IPC provides a reference voltage to the park position detect switch. When the gearshift is in PARK (P), the brake shift indicator opens the circuit to ground and the IPC detects the high reference voltage. When the selector lever is moved out of PARK (P), the park position detect switch closes to ground, pulling the reference voltage low to the IPC.
The SelectShift® display indicates to the driver which gear is currently selected when the transmission is in the SelectShift® mode. When the transmission is in SelectShift® manual mode, the gear number is displayed in the SelectShift® display area next to the PRNDL display. The IPC receives the transmission gear display message from the BCM. The BCM receives the transmission gear display message from the PCM.
Safety Belt Warning Indicator
The RCM monitors the safety belt position through the safety belt buckle switch. The RCM provides a safety belt status message to the BCM. The BCM provides the safety belt status message to the IPC to either turn on or turn off the safety belt warning indicator.
Stability-Traction Control Disabled Indicator (Sliding Car OFF Icon)
The stability-traction control is configured on/off through the message center. When the driver enables or disables the stability-traction control system, the ABS module sends the stability-traction control disabled indicator request message to the BCM. The BCM sends the stability-traction control disabled indicator request message to the IPC to illuminate or turn off the stability-traction control disabled indicator (sliding car OFF icon) based upon the system state.
When a MyKey® administrator has set the AdvanceTrac® On feature to always on and a MyKey® programmed key is in use, the stability-traction control system cannot be disabled. The menu selection in the message center used to disable the stability-traction control system does not display when a MyKey® is in use, but remains active for the MyKey® administrator to select the AdvanceTrac® always on feature off. The stability-traction control indicator still functions normally to indicate a stability-traction control system fault and a stability-traction control active event.
Stability-Traction Control Indicator (Sliding Car Icon)
The IPC receives the stability-traction control indication message from the BCM. The BCM receives the stability-traction control indication message from the ABS module. The stability-traction control indicator (sliding car icon) flashes when the vehicle stability-traction control is in active mode, and illuminates continuously if a fault condition exists in the stability-traction control system. The IPC monitors the stability-traction control indication message from the BCM module and either flashes the stability-traction control indicator (sliding car icon) or illuminates it steady depending on the condition.
TPMS Indicator
The IPC receives TPMS data from the BCM. If the BCM determines that the tire pressure has exceeded the low tire pressure limits, the tire pressure indication message is sent to the IPC to illuminate the TPMS warning indicator. If a TPMS fault condition exists, the BCM sends the tire pressure indication message to the IPC to flash the TPMS warning indicator for 75 seconds, then illuminates the indicator continuously.
Component Description
Brake Fluid Level Switch
The brake fluid level switch is a reed-type switch that is mounted in the master cylinder reservoir. The brake fluid level switch is hardwired to the BCM through a signal circuit and grounded through a separate body ground circuit. The BCM provides a reference voltage to the brake fluid level switch. When the brake fluid level is low, the float drops, allowing the reed switch to open, sending the reference voltage high. When the brake fluid level is high, the float lifts, closing the switch contacts, providing a ground and pulling the reference voltage low on the signal circuit to the BCM.
EOP Sensor (2.0L Engine)
The oil pressure sensor is hardwired to the PCM through VREF, signal and return circuits. The PCM provides the sensor voltage supply on the VREF circuit and monitors the voltage changes through the signal and return circuits as the oil pressure changes.
EOP Switch (1.5L And 2.5L Engines)
The EOP switch is a normally open switch with no oil pressure and is hardwired to the PCM. The PCM provides a reference voltage to the EOP switch. When the oil pressure is within normal limits, the EOP switch closes to ground pulling the reference voltage low to the PCM. When the oil pressure is low, the EOP switch is open sending the reference voltage high to the PCM.
Fuel Level Sender
The fuel level sender is mounted to the fuel pump assembly. As the fuel level changes, the float rises or falls with the fuel level moving the sweep arm across the resistor wires. This movement either increases or decreases the resistance through the unit. The fuel level sensor resistance ranges between 464 ohms ± 4 ohms at empty (E) and 51 ohms ± 2 ohms at full (F). When the fuel level is low, the fuel level sensor resistance is high. When the fuel level is high, the fuel level resistance is low.
The fuel pump assembly is hardwired to the BCM through separate signal and return circuits. The fuel level return circuits are grounded internally in the BCM. The BCM provides a reference voltage on the fuel level signal circuit. As the fuel level changes, the change in resistance raises or lowers the fuel level signal voltage depending on the resistance of the fuel level sender.
IPC
The IPC provides the driver with a system status and alerts the driver when certain conditions exist in the vehicle. The IPC receives the ignition status from the BCM over the MS-CAN. The IPC requires PMI when replaced.
Key-In-Ignition Switch
The key-in-ignition is part of the ignition switch. When the key is inserted into the ignition lock cylinder, voltage is provided to the BCM.
Liftgate Ajar Switch
The liftgate ajar switch is part of the liftgate latch assembly. When the liftgate is closed, the liftgate ajar switch is closed to ground. The BCM provides a reference voltage to the liftgate ajar switch. When the liftgate is closed, the liftgate ajar switch closes to ground, pulling the reference voltage low to the BCM. When the liftgate is ajar, the liftgate ajar switch opens sending the reference voltage high in the BCM.
Park Position Detect Switch
The park position detect switch is hardwired to the IPC through a single signal circuit. The park position detect switch is hardwired to a separate ground circuit through the selector lever. The IPC provides a reference voltage to the park position detect switch. When the selector lever is in PARK (P), the park position detect switch opens to ground, sending the reference voltage high. When the selector lever is moved out of PARK (P), the park position detect switch routes the reference voltage to ground, pulling the circuit low to the IPC.
Parking Brake Position Switch
The parking brake position switch is hardwired to the BCM through a signal and ground circuit. The BCM provides a reference voltage on the signal circuit. The parking brake position switch is grounded externally through a separate circuit. When the parking brake is not applied, the parking brake position switch is open. When the parking brake is applied, the parking brake position switch closes, pulling the reference voltage low.
Safety Belt Buckle Sensor
The safety belt buckles contain integrated sensors that are hall-effect switches. The safety belt buckle sensors are serviced as one component with the safety belt buckle.