Check Coolant Level -2

The IPC supplies ignition voltage to the coolant level switch via circuit 1478 (LT GRN). The IPC monitors this circuit at connector C2 terminal B3, If the coolant fluid level drops low enough the switch closes and circuit 1478 (LT GRN) is grounded via circuit 150 (BLK). When the IPC detects this ground condition, and the circuit remains grounded for at least 30 seconds, the IPC displays this message to the PCM.