Odometer: Description and Operation

ODOMETER

The vehicle odometer is calculated and stored electronically in the body control module (BCM). The BCM calculates and stores the mileage based on the vehicle speed GMLAN message from the powertrain control module (PCM) or the engine control module (ECM). The instrument panel cluster (IPC) displays the season odometer information sent from the BCM over GMLAN. Refer to Data Link Communications Description and Operation and Body Control System Description and Operation. The odometer will display 'error' if an internal IPC memory failure is detected or if there is a GMLAN communication fault between the PCM/ECM and the BCM.

The driver information center (DIC) in the radio displays Trip Odometer A or Trip Odometer B information sent from the BCM over GMLAN serial data circuit. Press the INFO button until Trip A or Trip B is displayed. The trip Odometer displays the current distance traveled since the last reset for each Trip Odometer (A or B) in either miles or kilometers. Both odometers can be used at the same time. Each trip odometer can be reset to zero separately by pressing and holding the ENTER button for a few seconds while the desired trip odometer is displayed. The Trip A or Trip B Odometer will display "- - -.- -" if there is a GMLAN communication fault between the PCM/ECM and BCM.