General Information

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The instrumentation 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).

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

  • "Warning and Indicator Lights"

  • "Instruments"

  • "Driver Message Center"

Fig. shows a typical ICU3 instrument cluster.

Fig. shows the ICU3S instrument cluster.

Note: This instrument cluster is shown with the U.S. speedometer, which shows miles per hour (mph) more prominently than kilometers per hour (km/h).

  1. Engine Oil Pressure Gauge

  2. Lightbar

  3. Driver Message Center

  4. Headlight High-Beam Indicator

  5. Fuel/DEF Level Gauge

  6. Primary Air Pressure Gauge

  7. Mode/Reset Button

  8. Secondary Air Pressure Gauge

  9. Speedometer (U.S. version)

  10. Tachometer

  11. Transmission Temperature Gauge

  12. Coolant Temperature Gauge

Fig. 1, ICU3 (EPA10 shown)

Note: This instrument cluster is shown with the U.S. speedometer, which shows miles per hour (mph) more prominently than kilometers per hour (km/h).

  1. Engine Oil Pressure Gauge

  2. Optional Telltales

  3. Driver Message Center

  4. Fuel/DEF Level Gauge

  5. Primary Air Pressure Gauge

  6. Secondary Air Pressure Gauge

  7. Speedometer (U.S. version)

  8. Tachometer

  9. Transmission Temperature Gauge

  10. Coolant Temperature Gauge

Fig. 2, ICU3S (GHG14 and newer shown)

Note:
Parent topic: Instrumentation Control Unit
Document Number: 0000117408
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-05-09