SW1 L4-1.9L SOHC VIN 8 (1996)
Coolant Level Indicator Lamp: Description and Operation
The low coolant indicator lamp is connected to ground by an 820 ohm, 1/2 watt resistor, located in the instrument cluster. When the coolant level is
adequate it is pulled up to IGNITION 1 by the coolant level switch. If the coolant level is below a specified level, this switch opens and the input level
drops to GROUND. This signal activates a counter integrated circuit (IC) which, after a 10 +/- 2 second delay, drives an NPN transistor and turns on the
indicator lamp. This indicates to the operator that the coolant level is low.
During engine start-up the LOW COOLANT indicator lamp is illuminated, for 2.5 seconds (+/- 0.5 seconds), by the integrated circuit built into the
instrument cluster for a bulb check.
