RTT 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.

4WD (2H, 4A, 4L, And 4H)

The IPC provides RTT indicators to inform the driver of the status of the 4WD system state. The IPC receives the 4x2 indicator, 4WD auto lamp display, 4WD low indicator request and 4WD high indicator request messages from the GWM over the HS-CAN3. The GWM receives the 4x2 indicator, 4WD auto lamp display, 4WD low indicator request and 4WD high indicator request messages from the TCCM over the HS-CAN2.

Auto High Beam (If Equipped)

The IPC provides the auto high beam RTT indicator to inform the driver the auto high beam function is turned on and the high beam status may automatically change. The IPC receives the auto high beam indication request from the GWM over the HS-CAN3. The GWM receives the auto high beam indication request from the IPMA over the HS-CAN2.

Auto Hold

The IPC provides the auto hold RTT indicator to indicate to the driver the state of the auto hold feature. The auto hold feature holds a vehicle stationary once the vehicle has come to a stop using the brakes, allowing the driver the convenience of removing his or her foot from the brake pedal. The IPC receives the auto hold mode indicator message from the GWM over the HS-CAN3. The GWM receives the auto hold mode indicator message from the ABS module over the HS-CAN2.

Auto Stop-Start

The IPC provides the auto stop/start RTT indicator that 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.
Grayed out - system unavailable

The IPC receives the stop/start standby request from the GWM over the HS-CAN3. The GWM receives the auto stop/start standby request from the PCM over the HS-CAN1.

Blind Spot Monitoring System (BLIS®) Off

The IPC provides the RTT indicator to inform the driver that the Blind Spot Monitoring System (BLIS®) is turned off. The IPC receives the cross traffic alert left status, cross traffic left sensor status, cross traffic alert right status, cross traffic right sensor status, side obstacle sensor status-left and side obstacle sensor status-right messages from the GWM over the HS-CAN3. The GWM receives the cross traffic alert left status, cross traffic alert right status, cross traffic right sensor status, cross traffic left sensor status, side obstacle sensor status-left and side obstacle sensor status-right messages from the SODL and SODR over the MS-CAN.

Charging System

The IPC provides a charging system RTT indicator along with message displays indicating the status of the charging system. When a fault is present in the charging system, the BCM sends the battery low state of charge message to display message center warning messages and the charging system RTT indicator.

The IPC receives the battery low state of charge message from the GWM over the HS-CAN3. The GWM receives the battery low state of charge message from the BCM over the HS-CAN1.

Cruise Control/ACC

The IPC uses the following messaged inputs to control the cruise control RTT indicator:

cruise control status
cruise control set speed display
cruise control override

The IPC receives the cruise control messages from the GWM over the HS-CAN3. The GWM receives the cruise control messages from the PCM over the HS-CAN1.

Door, Hood Or Liftgate Ajar Warning

The IPC provides a door ajar, hood ajar and liftgate ajar RTT warning indicator along with message displays to indicate the status of the doors, hood and liftgate. The BCM monitors each of the ajar inputs (driver door, passenger door, left rear door, right rear door, hood and liftgate) and sends a door ajar status (driver door ajar status, passenger door ajar status, left rear door ajar status, right rear door ajar status, hood ajar status or liftgate ajar status) message to the GWM over the HS-CAN1. The IPC receives the driver door ajar status, passenger door ajar status, left rear door ajar status, right rear door ajar status, hood ajar status or liftgate ajar status messages from the GWM over the HS-CAN3 to display the specific ajar RTT and corresponding warning message.

ELD

The message center provides the ELD RTT indicator to inform the driver that the electronic locking differential has been selected on. The IPC receives the rear differential indicator request message and the rear differential lock message request from the GWM over the HS-CAN3. The GWM receives the rear differential indicator request message and the rear differential lock message request from the PCM over the HS-CAN1.

Engine Over-Temperature

The provides the engine over-temperature RTT indicator to alert the driver the engine is overheating. The IPC receives the engine overheat indication request and the engine coolant temperature data from the GWM over the HS-CAN3. The GWM receives the engine overheat indication request and the engine over-temperature message from the PCM over the HS-CAN1.

Hill Descent Control Indicator

The hill descent control RTT indicator informs the driver the hill descent function is turned on and may be in ready mode, active control mode or over-temperature mode. The IPC receives the hill descent message from the GWM over the HS-CAN3. The GWM receives the hill descent message from the ABS module over the HS-CAN2.

Low Fuel

To supplement the fuel gauge indication, the IPC provides the low fuel RTT indicator. When the fuel level reaches approximately 120 km (75 miles) (MyKey® users only) and 80 km (50 miles), 40 km (25 miles), 20 km (10 miles) and 0 km (0 miles) for MyKey® and administrator key users, the IPC turns on the low fuel RTT indicator.

Low Oil Pressure

The IPC uses the engine oil pressure warning indicator request and engine rpm data to control the low oil pressure indicator. The engine oil pressure sensor is hardwired to the PCM. The PCM provides the engine oil pressure warning indicator request and the engine rpm data to the GWM over the HS-CAN1. The GWM provides the oil pressure warning indicator request and engine rpm data to the IPC over the HS-CAN3. The IPC requires engine rpm above 400 rpm before the message center displays the low oil pressure RTT.

Low Washer Fluid Level

The low washer fluid level switch is hardwired to the IPC through a single signal circuit and is grounded through a separate ground circuit. When the washer fluid is low, the washer fluid level switch closes to ground. When the IPC detects the washer fluid input pulled low and illuminates the low washer fluid level RTT indicator.

Overspeed Warning (Gulf Cooperative Countries [GCC])

The IPC provides an overspeed warning RTT to inform the driver that the vehicle speed has reached or exceeded the 120 km/h (75 mph) threshold. The IPC receives the vehicle speed signal from the GWM over the HS-CAN3. The GWM receives the vehicle speed signal from the PCM over the HS-CAN1.

Powertrain Malfunction (Wrench)

The IPC provides a powertrain malfunction (wrench) RTT indicator to indicate:

a 4WD concern.
a BCM concern.
a gear shift concern.
a powertrain concern (Electronic Throttle Control [ETC]).
a transmission concern.

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

The GWM receives the body service required message from the BCM over the HS-CAN1.

The GWM receives the gearshift module service required message from the GSM over the HS-CAN2.

The GWM receives the 4WD service required request message from the TCCM over the HS-CAN2.

The GWM receives the engine service required and transmission service required messages from the PCM over the HS-CAN1.

Tow Haul

The tow haul RTT indicator illuminates when the tow haul system has been engaged and is actively providing tow haul control for the vehicle. When equipped with auto tow haul, the message center provides a menu to allow the driver to enable or disable the tow haul feature. On vehicles without auto tow haul, the menu in the message center is turned off and the tow haul feature is enabled and controlled by the PCM.

When the driver enters the message center tow haul menu and changes the selection, the IPC sends the auto tow allow request menu message to the GWM over the HS-CAN3. The GWM then sends the auto tow allow request menu message to the PCM over the HS-CAN1. Once the PCM acts upon the request to change state, the PCM sends the auto tow allow status menu message to the GWM over the HS-CAN1. The GWM then sends the auto tow allow status menu message to the IPC over the HS-CAN3.

When the system is actively providing tow haul control, the PCM sends the auto tow active status message to the GWM over the HS-CAN1. The IPC receives the auto tow active status message from the GWM over the HS-CAN3.