•
Air pressure falls below approximately 70 psi
(483 kPa).
•
Parking brake is set with the vehicle moving
faster than two miles per hour.
•
System voltage falls below 11.9 volts.
•
Door is open or the headlights are on, with the
parking brake off.
•
Driver seat belt is not fastened with the parking
brake off (optional).
•
Outside temperature falls below 35°F (1.7°C)
(optional).
Warning and Indicator Lights
The ICU lightbar has three or four rows of warning
and indicator lights with icon symbols, depending on
the ICU. The positions of the lights may vary for the
different ICU’s, but the telltales are standard for all
applications. See
Table 4.1 for a listing of standard
and commonly used warning and indicator lamps.
06/27/2012 f611164
1
2
3
4
5
6
7
8
9
10
1. Engine Oil Temperature Gauge
2. Front Axle Temperature Gauge
3. Rear Axle Temperature Gauge
4. Speedometer and Coolant
Temperature Gauge
5. Fuel/DEF Level Gauge
6. Tachometer and Engine Oil
Pressure Gauge
7. Primary Air Pressure Gauge
8. Secondary Air Pressure Gauge
9. Transmission Oil Temperature
Gauge
10. Driver Message Center
Fig. 4.3, ICU4Me Instrument Cluster
IGNITION SWITCH
PARKING BRAKE
RELEASED
IF NO FAULTS
WERE DETECTED
IF FAULT DETECTED
APU 190
123456.7
12.3 VOLTS
123456.7
12.3 VOLTS
MI
MI
01/18/2012 f040420c
PARKING BRAKE
RELEASED
TURNED TO ON
ICU PERFORMS
SELF−TEST
Fig. 4.4, ICU Ignition Sequence
Instruments
4.3
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