Start/Stop Off Switch

The START/STOP Off switch is a driver select feature that permits the driver to inhibit the ESS feature from performing ESS stop and ESS start events. The START/STOP Off switch, which is located on the interface of the ICS switch bank, generates a signal that is transmitted to the BCM. The signal displays the ESS status when the customer disables the START/STOP Off switch. This is primarily used for feedback return to illuminate the START/STOP Off switch Light Emitting Diode (LED). When the ESS system is ON, there is no LED indication shown. When the ESS system is off or inhibited, the LED is constantly illuminated.

The PCM follows OBDII regulations for inhibited ESS to prevent failure in order to determine if the START/STOP Off switch is stuck. The START/STOP Off switch diagnostics will compare the state of two input switches. In the event that there is a disagreement between the states of the two switches, the PCM logic concludes that one of the switches has failed. Because this type of diagnostic cannot determine which switch is failed (and therefore the true state of the START/STOP Off switch press), the PCM assumes that the driver of the vehicle will not be able to inhibit the ESS system which, in turn, the PCM will set the appropriate DTCs. Until a fault has been validated, either switch input is accepted as a request to inhibit, thus not requiring both inputs to be set. The PCM will allow the START/STOP Off switch a calibrated limit of soft fails before the PCM matures those soft fails to hard fails.