Instrument Cluster Description and Operation
Displays Test
The instrument cluster displays a preview of information that includes electric range, charging, odometer, and battery status. This happens when the driver door is first opened, and following the welcome animation before starting the vehicle.
A CHARGING OVERRIDE/INTERRUPTION OCCURRED message may display on the lower left of the screen to indicate that a charging override or interruption has occurred due to:
| • | Override of charging settings by vehicle owner via OnStar. |
| • | Unintended interruption of AC power at the vehicle's charge port. |
| • | Interruption of charging by the utility company via OnStar as authorised by vehicle owner. |
Refer to the owners manual for a complete list of vehicle charging status screen messages.
Indicators and Warning Messages
Refer to Indicator/Warning Message Description and Operation .
Engine Coolant Temperature Gauge
The instrument cluster displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the engine coolant temperature information via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the engine coolant temperature. The engine coolant temperature gauge defaults to 40°C (104°F) or below if:
| • | The ECM detects a malfunction in the engine coolant temperature sensor circuit. |
| • | The BCM detects a loss of serial data communications with the ECM. |
| • | The instrument cluster detects a loss of serial data communications with the BCM. |
Fuel Level Gauge
The instrument cluster displays the fuel level based on the information from the ECM. The ECM converts the data from the fuel level sensors to a fuel level signal. The ECM sends the fuel level signal via a High Speed CAN-Bus signal to the BCM. The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the fuel level. If the fuel level falls under 11% the instrument cluster switches on the low fuel level indicator. The fuel gauge defaults to empty if:
| • | The ECM detects a malfunction in the fuel level sensor circuit. |
| • | The BCM detects a loss of serial data communications with the ECM. |
| • | The instrument cluster detects a loss of serial data communications with the BCM. |
Speedometer
The instrument cluster displays the vehicle speed based on the information from the ECM. The ECM sends the vehicle speed information via a High Speed CAN-Bus signal to the BCM. The BCM then sends the vehicle speed information via a Low Speed CAN-Bus signal to the instrument cluster in order to display the vehicle speed, either in kilometres or miles, based on the vehicle requirements. The speedometer defaults to 0 km/h (0 MPH) if:
| • | The BCM detects a loss of serial data communications with the ECM. |
| • | The instrument cluster detects a loss of serial data communications with the BCM. |
Odometer
The instrument cluster displays the vehicle odometer in the driver information centre. The ECM send a distance rolling count message on GMLAN to the body control module (BCM). The BCM uses this information to calculate the vehicle odometer. This odometer value is then sent to the instrument cluster on GMLAN. The instrument cluster does not calculate the odometer. The odometer displays miles or kilometres as selected in the Units menu.
The odometer value is stored in multiple modules. The instrument cluster is a secondary storage module for the odometer, while the BCM is the primary storage and accumulator.
In addition to storing the odometer value for the vehicle, the instrument cluster and the BCM store the VIN. Software checks are performed to ensure these modules, and their stored odometer information, cannot be moved or transferred between different vehicles.
If the VINs do not match, the instrument cluster will go into an error mode and display "----" (dashes). If the VIN mismatch exists over a calibrated distance, the instrument cluster will "lock" the odometer display and only show dashes, even if the VIN mismatch is subsequently correct. The only way to clear or "unlock" the instrument cluster is to perform a BCM programming event using SPS.
Tachometer
The instrument cluster displays the engine speed based on the information from the ECM. The ECM converts the data from the engine speed sensor to an engine revolution signal. The ECM sends the engine speed information via a High Speed CAN-Bus signal to the BCM. The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the engine speed. The tachometer defaults to 0 RPM if:
| • | The ECM detects a malfunction in the engine speed sensor circuit. |
| • | The BCM detects a loss of serial data communications with the ECM. |
| • | The instrument cluster detects a loss of serial data communications with the BCM. |
Compass
The vehicle may have a compass display on the Driver Information Centre. The compass receives its heading and other information from the Global Positioning System (GPS) aerial. If applicable, the GPS aerial is located with the telematics communication interface control module. For GPS diagnostic information refer to 149623
Driver Information Centre Display
In the lower middle of the instrument cluster, an additional display is installed. Its task is to give additional information, such as an odometer or error codes. This part of the instrument cluster is available in 4 different variants, mostly depending on the assembled engine. For further information refer to Driver Information Centre (DIC) Description and Operation .
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