AIR DRYER GP 4503729 - Caterpillar

Status Indicator
Illustration 1 g01002949
Typical installation of the Status Indicator (1) Status Indicator (2) Keyswitch with Exciter CoilThe state of the MSS is displayed by the status indicator in accordance with Table 1. The operator can use the status indicator to determine the status of the system or for troubleshooting.
Table 1
Status Indicator    Description    
Continuously Red     The MSS is armed. (1)    
Continuously Green     The MSS is disarmed.
The green LED will remain ON 30 seconds after powerdown. After the 30 seconds have passed the MSS automatically returns to the "armed" mode.    
Continuously Orange (2)     The red LED and the green LED of the status indicator are tested momentarily by the MSS ECM at powerup. The status indicator will remain on if No "application" software is detected in the electronic control module (ECM).    
The green LED and the red LED alternately blink for ten minutes.
    The MSS is disarmed.
This indicates that the voltage of backup battery in the MSS is low. The MSS is permanently disarmed.    
( 1 ) The red LED will remain ON while the key is in the ON position or until a valid key is read. The red LED will turn OFF approximately 3 seconds after the key is turned to the OFF position.
( 2 ) The red LED and the green LED are continuously ON.