Instrument Panel Cluster (IPC) - System Operation And Component Description: Indicators

ABS Warning Indicator

The IPC receives the ABS warning indicator request message from the GWM over the I-CAN. The GWM receives the ABS warning indicator request message from the ABS module over the HEV - CAN. 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 Brake/Stability-Traction Control System Indication description for information on the conditions when the ABS warning indicator is turned on.

Airbag Warning Indicator

The IPC receives the airbag warning indicator request from the BCM over the MS-CAN. The BCM receives the airbag indicator request from the RCM over the HS-CAN. If a SRS concern is detected, the RCM sets a DTC and the IPC illuminates the airbag warning indicator.

Brake Warning Indicator

The brake warning indicator informs the driver that the brake fluid level is low, the park brake is applied, or a fault exists in the base brake or ABS/stability-traction control system. The IPC uses 3 messaged inputs to control the brake warning indicator. The first 2 messages are the brake fluid level low indication and the park brake warning request. The third message is the brake warning indicator request message.

The IPC receives all 3 messages required to operate the brake warning indicator from the BCM over the MS-CAN.

The brake fluid level low indication and the park brake warning request messages originate in the BCM based on inputs from the brake fluid level switch and the park brake position switch.

The BCM receives the brake warning indicator request from the GWM over the HS-CAN. The GWM receives the brake warning indicator request from the ABS module over the HEV - CAN.

Refer to Brake/Stability-Traction Control System Indication description for information on the conditions when the brake warning indicator is turned on

Brake/Stability-Traction Control System Indication

The brake/stability-traction control system indication is controlled almost entirely by the ABS module. The ABS module can turn on multiple indicators for situations and various fault conditions. The following table provides a summary of the basic fault conditions and the indicators that are illuminated for each condition.

NOTE: Refer to the Normal Operation and Fault Condition description before each brake/stability-traction control system indicator Pinpoint Test (PPT) for the IPC default action for network/missing message conditions.

Event/Fault Condition	ABS Warning Indicator Status	Brake Warning Indicator Status	Stability-Traction Control Indicator Status	Stability-Traction Control Disabled Indicator Status
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	Off
Stability-traction control disabled by driver	Off	Off	Off	On
Single wheel speed sensor faults	On	Off	On	On
2 or 3 wheel speed sensor faults	On	On	On	On
HCU valve fault	On	On	On	On
ABS module fault	On	On	On	On
HCU pressure sensor fault (master cylinder pressure input)	Off	On	On	On
ABS battery voltage faults.	On or Off	Flashing	On	On
ABS pump motor fault	On	On	On	On
ABS low brake booster vacuum or vacuum sensor fault	On	Off	Off	Off
Steering wheel angle sensor center not found fault	Off	Off	On	On
Vehicle Identification Number (VIN) mismatch	Off	On	On	On
ACC and ABS both active	Off	Off	On	Off

Fog Lamp Indicator

The fog lamp indicator informs the driver the fog lamps are turned on. The IPC receives the fog lamp indicator request from the BCM over the MS-CAN.

High Beam Indicator

The high beam indicator informs the driver the high beams are turned. The IPC receives the high beam indicator request from the BCM over the MS-CAN.

LH-RH Turn Signal/Hazard Indicator

When the multifunction switch is in the LH or RH turn position or if the hazard switch is on, the BCM sends the turn indication status message to the BCM over the MS-CAN. Upon receipt of the applicable turn signal on/off data, the IPC flashes the turn signal indicator(s) on and off.

Lights On Indicator

When the parking lamps are turned on, the BCM sends the position light status message to the IPC over the MS-CAN.

MIL

The IPC receives the MIL request from the GWM over the I-CAN. The GWM receives the MIL request from the PCM over the HEV - CAN.

PRNDL Indicator

NOTE: When the vehicle is in transport mode, the PRNDL is not displayed upon entry or exit from the vehicle to prevent battery drain during long periods of time when the vehicle is not in use, such as those experienced during vehicle transport.

The IPC uses 4 separate messages to control the PRNDL. The messages are:

Transmission gear display
Transmission gear display status
Vehicle speed
Vehicle mode

The IPC receives all the messages required to control the PRNDL from the BCM over the MS-CAN.

The BCM receives the transmission gear display, the transmission gear display status and the vehicle speed messages from the GWM over the HS-CAN.

The GWM receives the transmission gear display and the transmission gear display status messages from the PCM over the HEV - CAN.

The GWM receives the vehicle speed messages from the ABS module over the HEV - CAN.

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.

Ready To Drive Indicator

The ready to drive indicator informs the driver the vehicle is ready to be driven. Since the engine may turn on and off at different times during operation, the ready to drive indicator helps eliminate the potential for the driver to interpret the engine turning off as a stall or other failure condition. The IPC receives the ready to drive request from the GWM over the I-CAN. The GWM receives the ready to drive request from the SOBDMC over the HEV - CAN.

Seatbelt Warning Indicator

The RCM monitors the driver seatbelt position through the driver seatbelt buckle switch. The RCM provides the driver seatbelt buckle status message to the GWM over the HEV - CAN. The GWM provides the driver seatbelt status message to the IPC over the I-CAN to either turn on or turn off the seatbelt 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 GWM over the HEV - CAN. The GWM sends the stability-traction control disabled indicator request message to the IPC over the MS-CAN to illuminate or turn off the stability-traction control disabled indicator (sliding car OFF icon) based upon the system state.

Refer to Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control disabled indicator (sliding car OFF icon) is illuminated.

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.

Stability-Traction Control Indicator (Sliding Car Icon)

The IPC receives the stability-traction control indicator request message from the GWM over the MS-CAN. The GWM receives the stability-traction control indicator request message from the ABS module over the HEV - CAN.

Refer to 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 Warning Indicator

The IPC receives the tire pressure indication message from the BCM over the MS-CAN.

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.

Component Description

Brake Fluid Level Switch

The brake fluid level switch is a reed type switch 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.

Fuel Level Sender

The fuel level sender is a dual sweep potentiometer style resistor connected to a float mechanism that is mounted to the fuel pump assembly. 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 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 Programmable Module Installation (PMI) when the IPC is replaced.

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.

Parking Brake Position Switch

The parking brake position switch is hardwired to the BCM through a signal and return circuit. The BCM provides a reference voltage on the signal circuit. The return circuit is grounded internally in the BCM. 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.

Seatbelt Buckle Sensor

The seatbelt buckles contain integrated sensors that are Hall-effect switches. The seatbelt buckle sensors are serviced as one component with the seatbelt buckle.