BRACKET 7X5684 - Caterpillar

Table 5
Status of the Transmission Speed Selector Switch (Downshift)
Command Control Steering    
Switch Position     N/C
J1-25     N/O
J1-26    
Depressed     Open     Closed    
Released     Closed     Open    Note: The normally closed (N/C) circuit and normally open (N/O) circuit of the transmission speed selector switch is used for diagnostic purposes. If the normally closed (N/C) circuit and the normally open (N/O) circuit are open at the same time, the power train ECM records a fault. If the normally closed (N/C) circuit and the normally open (N/O) circuit are grounded at the same time, the power train ECM records a fault.Reference: For more