ABS: Refer to

Brake: Refer to Brake Warning System Description and Operation

The instrument panel cluster (IPC) illuminates the change engine oil indicator when the powertrain control module (PCM) determines that the engine oil should be changed. The IPC receives a class 2 message from the PCM requesting illumination. Once the oil is changed, perform the engine oil monitor reset procedure in order to clear the Change Engine Oil indicator. Refer to GM Oil Life System Resetting .

Charge: Refer to Charging System Description and Operation

The instrument panel cluster (IPC) illuminates the check gages indicator as determined by the powertrain control module (PCM). The PCM monitors the engine coolant temperature sensor and the engine oil pressure sensor. When the PCM detects that the engine coolant temperature is higher than normal or the engine oil pressure is lower than normal, the PCM sends a class 2 message to the IPC requesting illumination.

Differential Lock: Refer to Locking Differential Description and Operation

DRL: Refer to Exterior Lighting Systems Description and Operation

Engine Shutdown: Refer to Cooling System Description and Operation

Exhaust Brake: Refer to Exhaust Brake Description and Operation

Fasten Safety Belt: Refer to Seat Belt System Description and Operation

High Beam: Refer to Exterior Lighting Systems Description and Operation

Increase Engine RPM: Refer to Increase Engine RPM

Low Air: Refer to Brake Warning System Description and Operation

Low Coolant Level: Refer to Cooling System Description and Operation

The low engine oil Level indicator illuminates in the instrument panel cluster (IPC) when the powertrain control module (PCM) detects a low engine oil level condition. The PCM monitors the engine oil level switch. The PCM detects that the engine oil level is low when the switch is open and the engine oil level signal circuit is high. The IPC receives a class 2 message from the PCM requesting illumination.

Low Washer Fluid: Refer to Wiper/Washer System Description and Operation

Malfunction Indicator Lamp: Refer to Engine Control Component Description for the 7.8L engine

Reduced Engine Power: Refer to Cooling System Description and Operation

Reduce Engine RPM: Refer to ENGINE RPM REDUCED

Service Brake Soon: Refer to Brake Warning System Description and Operation

Service Transmission: Refer to Transmission System Description and Operation

Trailer ABS: Refer to Air ABS Description and Operation

Turn Signals: Refer to Exterior Lighting Systems Description and Operation

Wait to Start: Refer to Glow Plug System Description for the 7.8L engine

The instrument panel cluster (IPC) illuminates the water in fuel indicator in the message center when the water in fuel sensor detects water in the fuel system. The water in fuel sensor signal is low.