2
-
Malfunction Indicator Lamp (MIL)
3
-
Anti-lock Brake System (ABS) warning indicator
5
-
Traction control indicator
7
-
Low coolant warning indicator
8
-
Air bag warning indicator
18
-
Parking brake/brake warning indicator
19
-
Charge warning indicator
20
-
Low oil pressure warning indicator
The instrument cluster fitted from 01/99 is electronic. The instrument cluster consists of gauges, indicators, warning indicators and has a built-in self-diagnostic mode.
When the ignition switch is in position II with the engine off, the instrument cluster carries out a display test to verify that the warning indicators and monitored systems are functioning correctly. The warning indicators that illuminate during this display test are:
- Anti-lock brake system (ABS)
- Air bag system
- Charging system
- Park brake and low fluid level
- Low fuel
- Low oil pressure
Other indicators that are incorporated into the instrument cluster are:
- High beam
- Door ajar
- Low washer fluid
- Traction control
Instrument Cluster Gauges
Engine Coolant Temperature Gauge
Temperature information is received by the instrument cluster from the engine coolant temperature (ECT) sensor or the gauge sender for diesel. If the engine coolant temperature signal is missing or invalid, the engine coolant temperature gauge will indicate a default position below the cold.
Fuel Gauge
The instrument cluster receives the fuel level information from the fuel sender unit (part of the fuel pump module). This is a variable resistor which varies the ground supply to the gauge, therefore altering the gauge position. If no input signal or a faulty input signal is received, the fuel gauge will indicate a default position below the empty. The fuel level input signal is dampened to prevent movement of fuel in the tank affecting the gauge position.
Speedometer
The instrument cluster receives vehicle speed information from the vehicle speed sensor (VSS) which is then indicated in km/h or mph at the gauge. If there is no input from the VSS the instrument cluster defaults the speedometer to zero.
Odometer
The instrument cluster records the total mileage of the vehicle using information that is received from the VSS. This total mileage is shown by a liquid crystal display (LCD) built into the speedometer. If VSS information is not received the LCD will not increment. Incorporated into the odometer is a tripmeter which is reset by using the tripmeter reset button.
Tachometer
The instrument cluster receives tachometer information from the powertrain control module (PCM). If the engine speed (RPM) information sent to the instrument cluster is invalid or missing, the instrument cluster will default the tachometer to zero.
Warning Indicators – From 01/99 Onwards
Air Bag Warning Indicator
An open circuit, a short to battery, or an ABS failure will illuminate the ABS warning indicator. For additional information, refer to Section 206-09 Anti-Lock Control - Traction Control.
The brake system warning indicator has multiple functions. The warning indicator illuminates if the brake fluid level is low or if the parking brake is set. If both the ABS and the brake system warning indicators are illuminated, a concern exists in the ABS module. For additional information, refer to Section 206-09 Anti-Lock Control - Traction Control.
The generator controls the charging system and the charging system warning indicator. The generator is therefore responsible for turning the warning indicator OFF when the system is running, and illuminating it under fault conditions (including stall conditions). For additional information, refer to Section 414-00 Charging System - General Information.
The high beam indicator is hardwired directly from the multifunction switch. When the high beam is activated, the indicator illuminates.
The traction control (TC) indicator is controlled by the ABS/TC module. The TC indicator is illuminated when the TC is active.
The low oil pressure warning indicator is hardwired to the engine oil pressure switch. When the ignition is switched to position II, the low oil pressure indicator illuminates. After the engine is started and the oil pressure rises to a safe level, the oil pressure switch opens and switches off the oil pressure warning indicator.
The door ajar indicator is controlled by the generic electronic module (GEM), the door and the liftgate switches. The system operates by supplying a ground signal to the instrument cluster when a door or liftgate is opened or partially opened, which will illuminate the indicator.
The low washer fluid indicator illuminates when the washer fluid falls below a preset level.
The low fuel warning indicator illuminates when the fuel level falls below a preset level.
