SEAL-HEAD 8T8373 - Caterpillar

TC900C Data Radio
The TC900C data radio has two LED indicator lights in a single package next to the harness connector. The behavior of these LED indicator lights indicate the status of the data radio.The meaning of the data radio status LED indicator light activity is given in Table 1.
Table 1
TC900C Status LED Indicator Light Activity    
Orange LED Indicator     Green LED Indicator     Status    
Off     Off     No power or dead battery (less than 10.5 vdc)    
On     Off     Radio is powered and it is operational, but is not synchronized    
On     On     The radio has synchronized to the network and is transmitting, receiving or repeating    
On     Two short flashes, followed by a pause     Hardware error 1    
On     Four short flashes, followed by a pause     Unknown error    
On     Two one second flashes, followed by a pause     Low power    
On     Continuous flashing     High temperature    
Off     Four short flashes, followed by a pause     FATAL - Data overload    
Off     Two one second flashes, followed by a pause     FATAL - Very low power    
Off     Continuous flashing     FATAL - High temperature shutdown     TC450 Data Radio
The TC450 data radio has two LED indicator lights in a single package next to the harness connector. The behavior of these LED indicator lights indicate the status of the data radio. The meaning of the data radio status LED indicator light activity is given in Table 1.
Table 2
TC450 Status LED Indicator Light Activity    
Orange LED Indicator     Green LED Indicator     Status    
Off     Off     No power or dead battery (less than 10.5 vdc)    
On     Off     Radio is powered and it is operational, but is not synchronized    
On     On     The radio has synchronized to the network and is transmitting, receiving or repeating    
On     Two short flashes, followed by a pause     Hardware error 1    
On     Four short flashes, followed by a pause     Unknown error    
On     Two one second flashes, followed by a pause     Low power    
On     Continuous flashing     High temperature    
Off     Four short flashes, followed by a pause     FATAL - Data overload    
Off     Two one second flashes, followed by a pause     FATAL - Very low power    
Off     Continuous flashing     FATAL - High temperature shutdown     CR900 Data Radio
The CR series radio has antenna connections on the top, an electrical connector on the bottom, and a LED on the front. Refer to Table 3 for the LED states.
Table 3
LED Status    Description    
LED Off     No Power    
LED On Solid     The Radio has power, but is not synced with the base station.    
1 Hz flashing LED     The Radio has power.
The Radio is synchronized and receiving data.