Instrument Panel Cluster (IPC) - System Operation and Component Description: Indicators
ABS Warning
The IPC receives the ABS warning indicator request message from the GWM over the HS-CAN3. The GWM receives the ABS warning indicator request message from the ABS module over the HS-CAN2. 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.
Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the ABS warning indicator is turned on
ABS/Brake/Stability-Traction Control System
The brake/stability-traction control system indication is controlled almost entirely by the ABS module. The ABS module can illuminate multiple indicators for various fault conditions. The following table provides a summary of the basic fault conditions and the indicators that are illuminated for each condition.
| Event/Fault Condition | ABS Warning Indicator Status | Brake Warning Indicator Status | Stability-Traction Control Indicator Status | Stability-Traction Control Disabled Indicator Status |
|---|---|---|---|---|
| Stable driving (no control events) | Off | Off | Off | On or off based on driver request |
| Parking brake applied | Off | On | Off | Off |
| Low brake fluid level or brake fluid level input concern | Off | On | Off | Off |
| Stability-traction control event | Off | Off | Flashing | On or off based on driver request |
| Stability-traction control disabled by driver | Off | Off | Off | On |
| Single wheel speed sensor faults | On | Off | On | Off |
| 2 or 3 wheel speed sensor faults | On | On | On | Off |
| HCU valve fault | On | On | On | Off |
| ABS module fault | On | On | On | Off |
| ABS battery voltage faults | On | On or off | On | On |
| ABS pump motor fault | On | On | On | Off |
| HCU pressure sensor fault (master cylinder pressure input) | Off | Off | On | Off |
| Steering wheel angle sensor center not found fault | Off | Off | On | Off |
| Total CAN failure | On | Off | On | On |
| Configuration mismatch or not complete | Flashing | Off | Off | Off |
| Calibration of internal sensors not complete | Off | Off | Flashing | Off |
| Vehicle Identification Number (VIN) mismatch | On | On | On | Off |
| ACC and ABS both active | Off | Off | Flashing | Off |
| Sport/track mode | Off | Off | Off | On |
| Full system off (ABS on) | Off | Off | Off | On |
Airbag Warning
The IPC receives the airbag warning indicator request from the GWM over the HS-CAN3. The GWM receives the airbag warning indicator request from the RCM over the HS-CAN2. If a SRS concern is detected, the RCM sets a DTC and the IPC illuminates the airbag warning indicator.
Brake Warning
The brake warning indicator informs the driver the brake fluid level is low, there is a failure in the base brake system or the parking brake is applied. The IPC uses 3 messaged inputs to control the brake warning indicator.
The IPC receives the brake (red) warning indicator request, the brake fluid level low message request and the parking brake status messages from the GWM over the HS-CAN3.
The GWM receives the brake (red) warning indicator request from the ABS module over the HS-CAN2.
The GWM receives the brake fluid level low message request and the parking brake status messages from the BCM over the HS-CAN1.
Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the brake warning indicator is turned on.
Front Fog Lamp
The fog lamp indicator informs the driver that the fog lamps are turned on. The IPC receives the front fog lamp indicator request from the GWM over the HS-CAN3. The GWM receives the fog lamp indicator request from the BCM module over the HS-CAN1.
High Beam
The high beam indicator informs the driver that the high beams are turned on. The IPC receives the headlamp high/low status message from the GWM over the HS-CAN3. The GWM receives the headlamp high/low status message from the BCM module over the HS-CAN1.
LED Low Beam Malfunction
The LED low beam indicator informs the driver an LED low beam is not functioning correctly. The IPC receives the headlamp low beam out message from the GWM over the HS-CAN3. The GWM receives the headlamp low beam out message from the BCM over the HS-CAN1.
Lights On
When the parking lamps are turned on, the BCM sends the parklamp status message to the GWM over the HS-CAN1. The IPC receives the parklamp status message from the GWM over the HS-CAN3 to illuminate the lights on indicator.
MIL
The IPC receives the MIL request from the GWM over the HS-CAN3. The GWM receives the MIL request from the PCM over the HS-CAN1.
PRNDL
The IPC uses the following messages to control the PRNDL:
- Ignition status
- Power shed level request
- Transmission gear display
- Transmission shift mode display
- Vehicle speed
- Transport mode
The IPC receives the transmission gear display, transmission shift mode display and vehicle speed messages from the GWM over the HS-CAN3. The GWM receives the transmission gear display, transmission shift mode display and vehicle speed messages from the PCM over the HS-CAN1.
The IPC receives the ignition status, power shed level request and transport mode messages from the GWM over the HS-CAN3. The GWM receives the ignition status, power shed level request and transport mode messages from the BCM over the HS-CAN1.
When the vehicle is in transport mode, the PRNDL is not displayed upon entry or exit from the vehicle to prevent battery drain during longer periods of time when the vehicle is not in use, such as those experienced during vehicle transport. When load shed management determines the battery state of charge is low or critical when the ignition is OFF or in ACC, the IPC disables the PRNDL display to conserve battery voltage.
The IPC also uses a park position detect switch (part of the selector lever) input to signal the IPC the shift lever is fully seated in the PARK (P) position. The IPC compares the park position detect switch input with the transmission gear display message sent from the PCM.
Rear Fog Lamp (If Equipped)
The rear fog lamp indicator informs the driver that the rear fog lamps are turned on. The IPC receives the rear fog lamp indicator request from the GWM over the HS-CAN3. The GWM receives the rear fog lamp indicator request from the BCM module over the HS-CAN1.
Safety Belt Warning
The RCM monitors the driver safety belt position through the driver safety belt buckle switch. The RCM provides the driver safety belt buckle status message to the GWM over the HS-CAN2. The GWM provides the driver safety belt buckle status message to the IPC over the HS-CAN3 to either turn on or turn off the safety belt warning indicator.
Stability-Traction Control Indicator (Sliding Car Icon)
The IPC receives the stability-traction control indicator request message from the GWM over the HS-CAN3. The GWM receives the stability-traction control indicator request message from the ABS over the HS-CAN2.
Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control indicator (sliding car icon) is turned on.
Stability-Traction Control Disabled Indicator (Sliding Car OFF Icon)
The stability-traction control is configured on/off using the stability assist-traction control mode switch located in the center console. When the driver enables or disables the stability-traction control system, the ABS module sends the stability-traction control mode indicator message to the GWM over the HS-CAN2. The GWM sends the stability-traction control mode indicator message to the IPC over the HS-CAN3 to illuminate or turn off the stability-traction control disabled indicator (sliding car OFF icon) based upon the system state.
Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control disabled indicator (sliding car OFF icon) is turned on.
When a MyKey ® administrator has set the AdvanceTrac ® 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.
Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control indicator (sliding car icon) is turned on.
TPMS
The IPC receives the tire pressure warning indicator request from the GWM over the HS-CAN3. The GWM receives the tire pressure warning indicator request from the BCM over the HS-CAN1.
If the BCM determines the tire pressure has exceeded the low tire pressure limits, the tire pressure warning indicator request message is sent to the IPC to illuminate the TPMS warning indicator.
If a TPMS monitor or sensor fault condition exists, the BCM sends the tire pressure warning indicator request message to the IPC to flash the TPMS warning indicator. The IPC flashes the TPMS warning indicator for 75 seconds then turns the indicator on solid.
Turn Signal/Hazard
When the multifunction switch is in the LH or RH turn position or if the hazard switch is on, the BCM sends the left turn lamp on request or right turn lamp on request message to the GWM over the HS-CAN1. The GWM sends the left turn lamp on request or right turn lamp on request message to the IPC over the HS-CAN3. Upon receipt of the applicable turn signal on/off message, the IPC flashes the turn signal indicator on and off.
Component Description
Brake Fluid Level Switch
The brake fluid level switch 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 switch closes, pulling the reference voltage low. When the brake fluid level is high, the switch opens, sending the reference voltage high on the signal circuit to the BCM. The brake fluid level switch uses an internal resistor in parallel to enables the BCM to differentiate between a disconnected brake fluid level switch connector and a low level condition.
Fuel Level Sender
The fuel level sender is mounted to the fuel pump assembly or the fuel level sensor. The fuel level sender is a dual sweep potentiometer style resistor connected to a float mechanism. The dual sweep design provides a second resistance measurement that reduces the intermittent loss of data due to corrosion between the resistor wires and the sweep arm. 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 from 180 ohms ± 4 ohms at empty (E) to 10 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 sensor resistance is low.
Both the fuel pump assembly and fuel level sensor are hardwired to the IPC through separate signal and return circuits. The fuel level return circuits are grounded internally in the IPC. The IPC 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 through the GWM over the HS-CAN3. The IPC requires Programmable Module Installation (PMI) when the IPC is replaced.
Oil Pressure Switch (2.3L And 3.7L)
The oil pressure switch is a normally open switch that is hardwired to the PCM through a single signal circuit. The ground is provided by the switch housing when it is mounted on the engine. The PCM provides a reference voltage to the oil pressure switch. When oil pressure is low, the oil pressure switch remains open, sending the reference voltage high. When the oil pressure is sufficient, the oil pressure switch closes, pulling the reference voltage low to the PCM.
Oil Pressure Sensor (5.0L)
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 change in voltage changes though the signal and return circuits as the oil pressure changes.
Park Position Detect Switch
The park position detect switch is hardwired to the IPC through a single signal circuit and is grounded by a separate 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 closes to ground, pulling the reference voltage low. When the selector lever is moved out of PARK (P), the park position detect switch opens to ground, sending the reference voltage high to the IPC.
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.