Warning and Indicator Lamps
The instrument cluster has an emergency buzzer that sounds when serious conditions that require immediate attention occur.
A description of the standard warning and indicator lamps are listed below alphabetically.
ABS Warning
The ABS indicator illuminates when there is a malfunction in the vehicle antilock brake system (ABS).
Note: For more information about the ABS system, see Chapter 9 .
Warning: If the ABS warning light activates while driving, repair the system immediately to ensure full antilock brake capability. Operating the vehicle when the ABS needs to be serviced could cause an accident, possibly resulting in personal injury or death, or property damage.
Automatic Traction Control (ATC) Indicator
The ATC indicator illuminates during wheel spin and when the ATC system is active. When the system is active, it is set to deep snow/mud mode.
Battery Warning Lamp
The battery warning lamp notifies the driver that there is an issue with diagnostics.
Cruise Control
The cruise control indicator illuminates when the cruise control is activated.
Check Engine Warning
The check engine warning indicator illuminates when certain faults are detected. If a critical engine condition exists (for example, low oil pressure or high coolant temperature), the check engine indicator will illuminate to alert the driver to correct the condition as soon as possible. If the condition gets worse, the stop engine indicator will illuminate.
Note: If the check engine indicator illuminates during vehicle operation, take the vehicle directly to an authorized Freightliner service facility.
Electronic Stability Control (ESC) Indicator
The electronic stability control (ESC) indicator illuminates when the ESC system activates.
Fasten Seat Belt Warning
The fasten seat belts warning indicator illuminates for 5 seconds after the ignition switch is turned on.
Fog Lamp Indicator
The fog lamp indicator illuminates when the fog lamps are on.
Headlight/High-Beam Indicator
A green headlight indicator illuminates when the headlights are on.
The high-beam indicator (sideways beam icon) illuminates blue when the headlight high beams are on.
High Temperature Coolant Warning
The high coolant temperature indicator and emergency buzzer activate whenever the coolant temperature goes above a preset maximum specified by the engine manufacturer.
Hill Start Aid Indicator
The hill start aid indicator notifies the driver that the hill start aid system is not functioning correctly or is offline.
Lane Departure Warning
The lane departure warning activates when the vehicle is driven out of the current lane without a turn signal indicator active.
Lane Keep Assist Indicator
The lane keep assist indicator illuminates green when activated and lane markings are detected.
The lane keep assist is disabled by the vehicles turn signals, dashboard button, moderately hard steering, narrow lane width, curvature radius, or if the vehicle is moving at a speed less than 37 mph (60 km/h).
Left-Turn Indicator
The left-turn indicator flashes on and off when the left-turn signal lights are flashing.
Both turn indicators flash when the hazard warning flasher is turned on.
Low Air Pressure Warning
The low air pressure warning indicator and emergency buzzer activate when the engine is turned on if air pressure in the primary or secondary air reservoir is below 65 to 70 psi (448 to 483 kPa), and remain on until air pressure rises above that level in both reservoirs.
Low Diesel Exhaust Fluid (DEF) Warning
The low diesel exhaust fluid (DEF) warning indicator illuminates when the DEF tank is approximately 10% full. Fill the DEF tank as soon as possible to avoid engine derate (decreased engine power).
Low Fuel Indicator
The low fuel indicator illuminates when the fuel level is approximately 1/8 full.
Low Oil Pressure Warning
The low oil pressure warning indicator and emergency buzzer activate whenever the engine oil pressure goes below the preset minimum specified by the engine manufacturer.
Low Voltage Battery Warning
The low voltage battery warning indicator illuminates when the low voltage battery drops below 12 volts.
Low Windshield Washer Fluid Indicator
The low windshield washer fluid indicator illuminates when the washer fluid level is low.
Maintenance Warning Lamp
When the maintenance warning lamp illuminates, the message display center will alert the driver as follows:
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Oil Change Required—alerts the driver that the engine has reached the recommended oil change interval.
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Air Filter Reminder—the air filter requires checking or replacement.
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Transmission Prognostics Warning—if the transmission has prognostics enabled.
Malfunction Indicator Lamp (MIL)
The malfunction indicator lamp (MIL) indicates an engine emissions-related fault. See the engine operation manual for details.
Marker Light Indicator
The marker light indicator activates when the marker lights are on.
Parking Brake On Warning
The parking brake on indicator activates when the parking brake is engaged.
If the vehicle is moving at a speed of 2 mph (3 km/h) or more, the emergency buzzer will sound until the parking brake is released.
Right-Turn Indicator
The right-turn indicator flashes on and off when the right-turn signal lights are flashing.
Both turn indicators flash when the hazard warning flasher is turned on.
Shift Inhibit Indicator
The shift inhibit indicator illuminates when the gearbox ECU is prohibiting shifting.
Stop Engine Warning
The stop engine warning indicator illuminates if a malfunction that could cause engine damage occurs. In most cases, the engine protection warning will illuminate before the stop engine warning. When the stop engine warning indicator illuminates, immediately park the vehicle in a safe location and shut down the engine. Continued operation with the stop engine warning indicator illuminated will lead to automatic engine shutdown and possible engine damage.
Tire Pressure Monitoring System Indicator
The tire pressure monitoring system indicator illuminates when the system detects an issue with one or more tires such as under or over pressure or over temperature. A warning message also appears in the driver display screen.