System Operation: Indicators

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

ABS Indicator

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 indicator is turned on.

ABS/Brake/Stability-Traction Control System Indication

The brake/stability-traction control system indication is controlled by the IPC but is based almost entirely on inputs from 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.

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 Indicator Status	Brake Warning Indicator Status	Electronic Park Brake Fault Indicator Status	Stability-Traction Control Indicator Status	Traction Control Disabled Indicator Status
Parking brake applied	Off	Flashing while applying On when applied	Off	Off	Off
Low brake fluid level or brake fluid level input concern	Off	On	Off	Off	Off
Stability-traction control event	Off	Off	Off	Flashing	Off
Stability-traction control disabled by driver	Off	Off	Off	Off	On
Single wheel speed sensor faults	On	On	Off	On	Off
2 wheel speed sensor faults on the same axle or 3 wheel speed sensor faults	On	Flashing or on	On	On	Off
HCU valve fault	On	On	Off	On	Off
ABS module fault	On	Flashing or on	On	On	Off
HCU pressure sensor fault (master cylinder pressure input)	Off	On	Off	On	Off
ABS battery voltage faults	On	Flashing or on	On	On	Off
ABS pump motor fault	On	On	Off	On	Off
ABS low brake booster vacuum or vacuum sensor fault	Off	On	Off	Off	Off
Steering wheel angle sensor center not found fault	Off	On	Off	On	Off
ABS to CAN total failure	Off	Off	Off	On	Off
Thermal shutdown to brake over-temperature condition	Off	Off	Off	Off	Off
Parking brake switch fault	Off	Flashing	On	Off	Off
Configuration mismatch	Off	Off	Off	Off	Off
Vehicle Identification Number (VIN) mismatch	On	On	Off	On	Off
ACC and ABS both active	Off	Off	Off	Flashing	Off

Airbag Warning Indicator

The IPC receives the airbag warning indicator request from the GWM over the HS-CAN3. The GWM receives the airbag 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 Indicator

The brake warning indicator informs the driver the brake fluid level is low, there is a failure in the base brake system or the electronic park brake is applied. The IPC uses 3 messaged inputs to control the brake warning indicator.

Brake (red) warning indicator request
Brake warning indicator request
Electronic park brake (red) indicator request

The IPC receives the brake (red) warning indicator request, the brake fluid level low message request and the electronic park brake (red) indicator request messages from the GWM over the HS-CAN3.

The GWM receives the brake (red) warning indicator request and the electronic park brake (red) indicator request from the ABS module over the HS-CAN2.

The GWM receives the brake warning indicator request message 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.

Electronic Park Brake Indicator

The electronic park brake indicator indicates a fault in the electronic park brake system. The IPC receives the electronic park brake (yellow) indicator request from the GWM over the HS-CAN3. The GWM receives the electronic park brake (yellow) indicator request from the ABS module over the HS-CAN2.

Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the electronic park brake 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 front fog lamp indicator request from the BCM module over the HS-CAN1.

High Beam Indicator

The high beam indicator informs the driver that the high beams are on. The IPC receives the headlamp high/low beam status message from the GWM over the HS-CAN3. The GWM receives the headlamp high beam/low beam status message from the BCM module over the HS-CAN1.

LED Low Beam Malfunction Indicator

The LED low beam malfunction 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.

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 left turn lamp on request and right turn lamp on request messages to the GWM over the HS-CAN1. The GWM sends the left turn lamp on request and right turn lamp on request messages 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.

Lights On Indicator

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 And SelectShift

The PRNDL and SelectShift displays indicate to the driver which gear is currently selected when the transmission is in the SelectShift or manual mode. When the transmission is in SelectShift mode, the gear number is displayed in the SelectShift display area.

For additional information related to the SelectShift features, refer to the Owner's Literature.

The IPC uses the following messages to control the PRNDL and SelectShift indication.

Battery shed level request
Ignition status
Transport mode
Transmission gear display
Transmission shift mode display
Vehicle speed

The IPC receives all required messages from the GWM over the HS-CAN3.

The GWM receives the transmission gear display, transmission gear display mode and vehicle speed messages from the PCM over the HS-CAN1.

The GWM receives the ignition status, transport mode and battery shed level request messages from the BCM over the HS-CAN1.

Rear Fog Lamp Indicator (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.

Seatbelt Warning Indicator

The RCM monitors the driver seatbelt position through the driver seatbelt buckle sensor. The RCM provides the driver seatbelt buckle status message to the GWM over the HS-CAN2. The GWM provides the driver seatbelt status message to the IPC over the HS-CAN3 to either turn on or turn off the seatbelt warning indicator.

Stability-Traction Control Indicator (Sliding Car Icon)

The stability-traction control indicator (sliding car icon) informs the driver of the current status of the stability and traction control systems. The stability-traction control indicator illuminates when a fault condition exists or when an active traction control or stability control event is occurring. 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 is turned on.

TPMS Warning Indicator

The IPC receives the tire pressure warning indicator message from the GWM over the HS-CAN3. The GWM receives the tire pressure warning indicator message 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.

Traction Control Disabled Indicator (Sliding Car OFF Icon)

The traction control is configured on/off through the message center. When the driver enables or disables the traction control system, the ABS module sends the traction control mode message to the GWM over the HS-CAN2. The GWM sends the traction control mode message to the IPC over the HS-CAN3 to illuminate or turn off the 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 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 traction control system cannot be disabled. The menu selection in the message center used to disable the 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 traction control indicator is turned on.

Component Description

Brake Fluid Level Switch

The brake fluid level switch is mounted in the master cylinder reservoir and is hardwired to the BCM through a signal circuit. The brake fluid level switch is 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. This enables the BCM to differentiate between a disconnected brake fluid level switch connector and a full level condition.

Fuel Level Sender (Float and Card)

The fuel level sender is mounted to the fuel pump and sender unit. 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.

The fuel pump and sender unit is 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 PMI when the IPC is replaced. The IPC lens and mask assembly are replaceable as an assembly.

Oil Pressure Sensor

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.

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.