4-28 Controls and Instruments
DOB 1300-1556
PA-1639 Operator's Manual 2020 X3-45 Commuter
High Exhaust System Temperature (HEST)
Illuminates to notify the driver that the DPF is in active regenerative mode and that exhaust gas
temperature at the exhaust system diffuser are potentially hazardous
WARNING
During regeneration, exhaust temperature may reach up to 1200°F (650°C) at the particulate
filter. When parking the vehicle, if this telltale light is illuminating, make sure that the exhaust
system diffuser is away from people or any flammable materials, vapors or structures.
DPF Regeneration Request
Illuminates to notify the driver that a manual stationary regeneration will be required soon.
Def Tank Low Level Indicator
Illuminates when there is less than 2.6 gallons (10 liters) of DEF left in the tank.
CAUTION
This telltale light starts flashing when there is less than 0.8 gallons (3 liters) left in the tank. It may
flash in conjunction with the check engine and / or stop engine lights.
If the vehicle is kept in operation with an empty DEF tank, engine derate will eventually occur,
limiting the speed to 5 mph.
Charging System Warning Light
Indicates a malfunction of the charging system or a low battery voltage condition.
NOTE
“Charging System Malfunction” message will also appears in the DID
This telltale will also flash and an audible signal will be heard if a battery charger is plugged and the
parking brake is removed.
Intake Air Preheater On – Wait Before Starting
Illuminates when the intake air preheater element is in function. Wait until this telltale light has
turned off before starting the engine. For more information, refer to "COLD WEATHER STARTING"
in Section 6 Starting and Stopping Procedures.
Antilock Brake System (ABS)
Illuminates when the ABS is not available or when the ABS is malfunctioning. Since the ABS
system does not operate at less than 4 mph (7 km/h), the indicator will remain illuminated until the
coach reaches that speed. Refer to "ANTILOCK BRAKING SYSTEM (ABS)" in Section 5 Other
Features.
Esc - Electronic Stability Control
Quickly flashes every time the electronic stability intervenes. Will also flash when Mud/Snow mode
is turned on using the Mud/Snow switch.
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