Low Coolant Indicator

The low coolant lamp illuminates in order to indicate a low coolant level in the radiator. Battery voltage is available at the engine coolant level indicator module through the CKT 39 (PNK) wire from the GAUGES Fuse 4 when the ignition switch is in one of the following positions:
^ RUN
^ START

The module is grounded at Ground G101 by the CKT 150 (BLK) wire. The module senses a variable resistance to ground at the low engine coolant level indicator sensor through the CKT 1478 (LT GRN) wire. The sensor has a resistance of 50,000 Ohms or more when the coolant level is low. The resistance decreases to 10,000 Ohms when the radiator is full. The sensor is grounded at Ground G109 by the CKT 151 (BLK/WHT) wire. The low coolant lamp lights when the resistance to ground is approximately 50,000 Ohms or more.