PCM Controlled Warning Lamps

The oil pressure switch and the coolant level switch are connected to the Powertrain Control Module (PCM). If a low oil pressure condition, or a low coolant level condition is detected, the PCM will send a signal to the Instrument Panel Cluster (IPC). The IPC will receive this signal from the PCM and the IPC will then illuminate the warning lamp.

The electronic instrument cluster uses 2 telltale lamps. A Low Oil Pressure telltale lamp indicates low engine oil pressure. A Low Coolant Level telltale lamp indicates a low coolant level condition. The purpose of these lamps are to warn the operator of potential engine damaging conditions. If any of the warning lamps are illuminated, then a condition is present that may cause engine damage.