Instrument Cluster (Ic)

The Instrument Cluster (IC) receives a permanent battery voltage supply from the Rear Junction Box (RJB). A High Speed (HS) Controller Area Network (CAN) powertrain systems bus and HS CAN comfort systems bus are also connected to the IC which communicates with other control modules.

The speedometer is driven by HS CAN signals transmitted to 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 sensors to the ABS control module in the form of pulsed signals. The ABS control module converts these signals into the HS CAN powertrain systems bus to the IC.

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

The steering wheel switchpack inputs are sent to the IC via the Local Interconnect Network (LIN) input. Other vehicle sensors are connected to the Gateway Module (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.