HARNESS AS-WIRING 4801203 - Caterpillar

Illustration 1 g00785019
Electronic Control Module (ECM)
The Machine Security System (MSS) is an integrated feature for the machine ECM. The MSS software and components are integrated into an ECM that controls other machine functions.ECM Inputs
Push-to-Start Switch or Keyswitch
The push-to-start switch or key start switch is also used as an input signal to the MSS. The input from the key switch is used to determine when the machine is ON. Battery voltage is connected to this input through the ON and START positions of the keyswitch. See Table 1 for input voltages.
Table 1
Input Voltage 12V System 24V System
Machine is operating and the alternator is charging. 14.1 - 15.1V 27.6 - 29.6V
Machine is not running. 12V 24V ECM Outputs
Status Indicator
The status indicator displays the status of the system. The status indicator has two connections. One connection is for the red LED. The other connection is for the green LED.