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Check Gauges

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

If coolant temperature is too high or oil pressure is too low, Light Emitting Diode (LED) illuminates to alert driver of condition indicated by gauges. Instrument Panel Cluster (IPC) constantly monitors coolant temperature and oil pressure with engine running. Engine coolant information is sent to IPC over Class 2 serial data line from Vehicle Control Module/Powertrain Control Module (VCM/PCM). Oil pressure information is sent to IPC over designated circuit connected to oil pressure sending unit. As a check, LED illuminates for 3 seconds after ignition is turned on.

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