General Information

SD DM 04.00.01

The instrument control unit (ICU) provides the driver with engine and vehicle information. It is comprised of standard and optional gauges, an audible warning, a driver message center, and a lightbar containing warning and indicator lamps (also known as telltales). Warning and indicator lamps illuminate in red (danger), amber (caution), green (status advisory), or blue (high-beam headlights active).

122SD and Coronado vehicles are equipped with an ICU4, ICU4M, or ICU4Me. See Fig. and Fig. and Fig. for typical ICU layouts.

  1. Engine Oil Temperature Gauge

  2. Lightbar

  3. Engine Oil Pressure Gauge

  4. Coolant Temperature Gauge

  5. Forward Drive Axle Oil Temperature Gauge

  6. Battery Voltage Gauge

  7. Rear Drive Axle Oil Temperature Gauge

  8. Driver Message Center

  9. Mode/Reset Button

  10. Tachometer

  11. Speedometer

  12. Transmission Oil Temperature Gauge

  13. Primary Air Pressure Gauge

  14. Secondary Air Pressure Gauge

  15. Fuel/DEF Level Gauge

  16. Application Air Pressure Gauge

  17. Application Air Pressure Gauge

Fig. 1, Typical ICU4 Layout

  1. Engine Oil Temperature Gauge

  2. Lightbar

  3. Engine Oil Pressure Gauge

  4. Coolant Temperature Gauge

  5. Forward Drive Axle Oil Temperature Gauge

  6. Battery Voltage Gauge

  7. Rear Drive Axle Oil Temperature Gauge

  8. Driver Message Center

  9. Tachometer

  10. Speedometer

  11. Transmission Oil Temperature Gauge

  12. Primary Air Pressure Gauge

  13. Secondary Air Pressure Gauge

  14. Fuel/DEF Level Gauge

  15. Application Air Pressure Gauge

  16. Application Air Pressure Gauge

Fig. 2, Typical ICU4M Layout

  1. Application Air Pressure Gauge

  2. Suspension Air Pressure Gauge

  3. Transmission Oil Temperature Gauge

  4. Turbo Pressure Gauge

  5. Lightbar

  6. Driver Message Center

  7. Tachometer and Coolant Temperature Gauge

  8. Fuel/DEF Level Gauge

  9. Speedometer and Engine Oil Pressure Gauge

  10. Primary Air Pressure Gauge

  11. Secondary Air Pressure Gauge

  12. Front Axle Temperature Gauge

  13. Rear Axle Temperature Gauge

Fig. 3,  ICU4Me Instrument Cluster

The following headings in this chapter provide additional information and operating instructions for ICU components:

  • “Warning and Indicator Lights”

  • “Standard Instruments”

  • “Optional Instruments”

  • “Driver Message Center”

Note:
Parent topic: Instrumentation Control Units
Document Number: 0000122645
Manual Publication Date: 2025-01-23
Topic Publication Date: 2025-01-23