Instrument Cluster (Ic)

The Instrument Cluster (IC) receives a permanent battery voltage supply via the Rear Junction Box (RJB). The IC communicates with other control modules on the High Speed (HS) Controller Area Network (CAN) powertrain and comfort systems buses.

The speedometer is driven by HS CAN powertrain systems bus signals transmitted from the Anti-lock Brake System (ABS) control module. The wheel speed sensors are measured by sensors reading the rotational speed of the wheels from toothed targets on the hub.

The wheel speeds are passed from the sensors to the ABS control module in the form of pulsed signals. The ABS control module converts these signals into an HS CAN powertrain system bus signal to the IC and generates a signal output to drive the speedometer.

The tachometer is driven by an engine speed signal transmitted on the HS CAN powertrain system bus from the Powertrain Control Module (PCM). The signal is derived from the Crankshaft Position (CKP) sensor. The signal is received by the IC and generates a signal output to drive the tachometer.

The Electric Steering Column Lock (ESCL) is connected directly to the IC on a hardwired connection. The IC provides a controlled ground for the ESCL.

For additional information, refer to: Steering Column .

For additional information, refer to: Information and Message Center .

The alarm system Light Emitting Diode (LED) is controlled by the Body Control Module/Gateway Module (BCM/GWM) assembly which is connected on a hardwired connection to the IC.

Other vehicle sensors are connected to the BCM/GWM assembly which processes the signals from the sensors and passes them to the IC on the HS CAN powertrain systems bus. The Ambient Air Temperature (AAT) signal is received by the PCM which processes the signal and passes the information to the Automatic Temperature Control Module (ATCM) unit which sends the signal to the IC.