Change Oil/Oil Life Indicator

The PCM performs a powertrain specified oil life program and transmits a Class 2 Oil Life serial data message to the instrument cluster indicating the percent of oil life remaining. The instrument cluster compares the percent oil life remaining to a calibrated threshold and dictates the CHANGE OIL/OIL LIFE indicator state.

To reset the Oil Life indicator, the BCM reads a momentary reset switch input and transmits a Class 2 serial data message to the instrument cluster indicating that the switch has been closed. The switch must be momentarily depressed, for 3 seconds, in order to enter the Oil Life reset stage. At this point the instrument cluster flashes the CHANGE OIL/OIL LIFE indicator at 1 Hz in order to inform the driver that this program is the one chosen to be reset. (You can also reset Oil Life or Tire Inflation Monitoring System from this switch). The driver then has 3 seconds to depress and hold the switch. The instrument cluster sends out a Class 2 Oil Life serial data command message The PCM reacts to this message by resetting the remaining oil life to 100%.

In addition, the CHANGE OIL/OIL LIFE indicator goes on solid for a period of time and then turns off when the reset period is complete. The reset program is exited if either one of the following conditions is true:
^ If the reset switch is not depressed for the correct number of times
^ If the reset switch is not depressed for the correct time periods

When the BCM receives the command from the instrument cluster, an acknowledgment chime shall sound.

In the event of a PCM Class 2 serial data failure, the instrument cluster commanded indicator shall remain in its last state. In the event of a BCM Class 2 serial data failure, the chime shall not be triggered.