Start/Stop Disable Switch

THE ENGINE STOP/START (ESS) SWITCH IS A DRIVER SELECT FEATURE THAT PERMITS THE DRIVER TO INHIBIT THE ENGINE STOP/START FEATURE. THE ESS SWITCH IS TYPICALLY LOCATED IN A SWITCH BANK ON OR AROUND THE INSTRUMENT CLUSTER OR CENTER STACK. THE ESS SWITCH IS A SMART DEVICE THAT SENDS TWO REDUNDANT INPUT STATES TO THE BODY CONTROL MODULE (BCM) THROUGH A LIN BUS CIRCUIT. THE SWITCH IS A MOMENTARY PRESS INPUT, WITH THE TWO STATES OF THE SWITCH BEING PRESSED AND NOT PRESSED. IF THE SWITCH DETECTS A CIRCUIT FAULT ON EITHER OF THE INTERNAL SWITCHES, A FAULT MESSAGE IS SENT TO THE BCM FOR THE FAULTY SWITCH SIGNAL. THE BCM PASSES THE SWITCH INFORMATION TO THE POWERTRAIN CONTROL MODULE (PCM) OVER THE CAN BUS. THE PCM USES THIS INFORMATION FOR DETERMINING ESS SYSTEM OPERATION. THE PCM ALSO MONITORS FOR A STUCK SWITCH. IF THE INPUT STATE RECEIVED FROM THE ESS SWITCH IS PRESSED FOR MORE THAN A CALIBRATED PERIOD, THE STUCK SWITCH DIAGNOSTIC WILL FAIL.

THE SWITCH HAS A LIGHT EMITTING DIODE (LED) TO INDICATE TO THE DRIVER THE STATUS OF THE ESS SYSTEM. WHEN THE ESS SYSTEM IS ACTIVE, THE LED ON THE SWITCH IS OFF. WHEN THE ESS SYSTEM IS OFF OR INHIBITED, THE LED ON THE SWITCH IS CONSTANTLY ILLUMINATED.