Temperature Indicator

The coolant temperature indicator lamp is pulled to ground by the powertrain control module (PCM). When the lamp is pulled to ground current from the ignition circuit flows through the indicator lamp, allowing it to illuminate. This indicates to the vehicle's operator that the coolant temperature has exceeded a specified temperature.

On vehicles equipped with an automatic transaxle, the coolant temperature indicator lamp is also used to indicate a possible overheat condition within the automatic transaxle.

The coolant temperature indicator lamp is illuminated, for approximately two seconds, during engine start-up by the PCM for a bulb check.