Symbol | Description |
|---|---|
| ABS: Refer to ABS Description and Operation in Antilock Brake System or to Air ABS Description and Operation in Air Antilock Brake System |
AIR SUSP DUMP | Air Suspension Dump: Refer to Air Suspension Description and Operation in Air Suspension |
APPLY PARK BRAKE | Apply Park Brake: Refer to Park Brake System Description and Operation in Park Brake |
AUX BRAKE | Aux Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes |
| Charge: Refer to Charging System Description and Operation in Engine Electrical |
CHECK GAGES | Check Gages: Refer to Indicator/Warning Message Description and Operation |
DIFF LOCK | Differential Lock: Refer to Differential Lock System Description and Operation in Rear Axle Controls |
DRL 
| DRL: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
EXHAUST BRAKE | Exhaust Brake: Refer to Exhaust Brake Operation in Engine Exhaust |
| Fasten Safety Belt: Refer to Indicator/Warning Message Description and Operation |
| High Beam: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
LOW COOLANT | Low Coolant: Refer to Cooling System Description and Operation in Engine Cooling |
PARK BRAKE | Park Brake: Refer to Park Brake System Description and Operation in Park Brake |
PRIMARY BRAKE | Primary Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes or to Brake Warning System Description and Operation in Air Brakes |
SERVICE ENGINE SOON | Malfunction Indicator Lamp (MIL): Refer to Engine Control Component Description in Engine Controls - 7.8 L |
SERVICE PARK BRAKE | Service Park Brake: Refer to Park Brake System Description and Operation in Park Brake |
| Turn Signals: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
Check Gages
The CHECK GAGES indicator illuminates in the instrument control panel (IPC) when one the following occurs:
| • | The multifunction alarm module (MFAM) detects that the engine oil pressure is approximately 34 kPa (5 psi), or below. |
| The MFAM receives the engine oil pressure information via the engine oil pressure check gages signal circuit. |
| • | The MFAM detects that the engine coolant temperature is approximately 118°C (244°F), or above. |
| The MFAM receives the engine coolant temperature information via the engine coolant temperature check gages signal circuit. |
The MFAM grounds the check gages indicator control circuit in order to illuminate the CHECK GAGES indicator.
Fasten Safety Belt
The fasten safety belt indicator illuminates in the IPC, for approximately 6 seconds, when the seat belt alarm module detects that the ignition transitions to ON. The seat belt alarm module controls the illumination of the indicator and is located inside the IPC. No external circuits are involved.
