For 1990-2009 cars

### Brake Pad Wear Indicator Lamp

This lamp illuminates when the vehicle's front disc brake pad linings have worn to the point of replacement. When this occurs the front brake linings should be inspected and/or replaced along with the sensor. Once this indicator lamp has illuminated the sensor must be replaced as its integrity has been compromised. The sensor is mounted to the inner disc brake pad lining.

The LH and RH brake pad wear sensors are wired in series to ground. The gauge cluster supplies battery power to the circuit. As the front disc brake pad linings wear to the point of replacement, a spring type bridge in the sensor separates, opening the circuit. This signals the gauge cluster to ground the indicator lamp, warning the driver to have the brakes inspected.

### Brake To Shift Indicator Lamp

The Brake To Shift indicator, when illuminated, informs the driver to press on the brake pedal in order to move the gear selector out of the PARK position. The lamp illuminates with the gear selector in the PARK position and the ignition is in the ON or RUN position with the engine OFF or running.

The body control module (BCM) controls the operation of the Brake To Shift indicator lamp. The instrument cluster supplies battery power to the circuit. When the gear selector is in the PARK position, the BCM gear position circuit remains high, signaling the BCM to ground the Brake To Shift indicator lamp. After moving the gear selector out of the PARK position, the automatic transmission shift lock control switch grounds the BCM gear position circuit. This signals the BCM to remove the ground from the lamp.

### Check Engine Warning Lamp

The CHECK ENGINE lamp in the instrument cluster will come on during engine starting to serve as a bulb and system check. It should go off after the engine starts unless a problem has been detected by the engine management system.

The engine control module (ECM) performs a continual self diagnosis of certain control functions and causes the CHECK ENGINE lamp to remain on when the engine is running and a problem is detected. The CHECK ENGINE lamp will remain on only as long as the error is detected. The ECM will store in memory a current and/or history trouble code if a problem is detected.

### Engine Coolant Temperature Warning Lamp

The engine coolant temperature lamp comes on to warn the driver of high coolant temperature. The processor in the instrument cluster controls the operation of the indicator lamp.

### Fasten Seat Belt Indicator Lamp

When the ignition is in the ON or START position a chime will come on for about eight seconds to remind people to fasten their seat belts unless the driver's safety belt is already buckled. The fasten seat belt indicator lamp will also come on and stay on for about four seconds then will flash for about 60 seconds. If the driver's belt is already buckled neither the chime nor the lamp will activate.

### Fog Lamp Indicator Lamp

This indicator lamp will illuminate when the fog lamp switch has been depressed and the fog lamps are illuminated. The fog lamps will only work when the parking lamps and/or the headlamps are operating.

Depressing the fog lamp switch grounds the fog lamp relay coil, energizing the relay. Battery power is then supplied to the fog lamp indicator lamp and the fog lamps. The fog lamp relay is internal to the multifunction relay. The instrument cluster supplies the ground path for the indicator lamp.

### Fuel Cap Missing Warning Lamp

The FUEL CAP warning lamp will illuminate and start to flash, when the engine management system detects a leak in the fuel tank during the first drive cycle. This would be directly related to a fuel cap that is not fully tightened, is missing or improperly installed. The engine control module (ECM) controls the illumination of the fuel cap warning lamp. The lamp will continue to flash until the following occurs.

• | The engine is stopped.

• | Another fault is detected during the same drive cycle that is not related to leak detection.

The fuel cap warning lamp does not flash when the same fuel tank leak is detected during second drive cycle. The CHECK ENGINE lamp will illuminate when a leak is detected during the second drive cycle. There are no DTCs associated with the illumination of the fuel cap warning lamp.

### Low Coolant Warning Lamp

The low coolant warning lamp is controlled by the coolant level sensor. The coolant level sensor is located in the coolant reservoir. The sensor consists of a floating device and a reed contact that is normally switched to ground when the coolant level is in the normal operating range. When the coolant level goes below the minimum level, the reed contacts open signaling the gauge cluster to ground the indicator bulb.

### Low Fuel Warning Lamp

The low fuel indicator lamp will illuminate when the fuel level in the fuel tank is low (about two gallons). The processor in the instrument cluster controls the operation of the indicator lamp.

### Low Oil Level Indicator Lamp

This indicator lamp illuminates for a few seconds when the ignition is turned to the ON position.

The low oil level indicator lamp is controlled by the engine oil level sensor. The sensor consists of a floating device and a reed contact that is normally switched to ground when the oil level is in the normal operating range. When the oil level goes below the minimum level, as indicated on the oil level dipstick, the reed contacts open signaling the gauge cluster to ground the indicator bulb. The indicator bulb will illuminate only after the reed contacts are open approximately 2 minutes or longer. The bulb stays illuminated for approximately 1 minute or longer depending on how long the reed contacts stay open.

### Low Oil Pressure Warning Lamp

The low oil pressure lamp comes on to warn the driver when the engine oil pressure is low. Battery voltage is applied to one side of the bulb. A ground path is provided by the engine oil pressure switch. The engine oil pressure switch contacts are closed when the engine is OFF or the oil pressure is below 28 kPa (4 psi). After the engine starts and normal oil pressure builds up the engine oil pressure switch opens and the lamp goes out.

### SECURITY Indicator Lamp

The SECURITY indicator lamp will flash when the doors are opened during the arming of the universal theft-deterrent system to remind the driver to lock the doors and arm the system. The lamp will go off after the doors have been closed. The body control module (BCM) controls the operation of the indicator lamp.

### Air Bag Indicator Lamp

The air bag indicator lamp illuminates to warn the driver of a potential supplemental inflatable restraint (SIR) system problem that could prevent the proper deployment of an air bag. When the ignition switch is turned to the ON position (engine not started) the indicator lamp will flash seven times. After starting the vehicle, the lamp will flash several times then go out. If the lamp stays on, the SIR system must be repaired as soon as possible. The sensing and diagnostic module (SDM) performs a continual self diagnosis of certain control functions. The SDM will store in memory a current and/or history trouble code when a problem is detected.

### Sport Mode Indicator Lamp and Automatic Transmission Warning Lamp (STL)

The sport mode indicator lamp illuminates when the vehicle has been put into the sport mode by pressing the "S" button on the gear selector. When this lamp is illuminated the vehicle will have slightly firmer shifts and increased performance for part and full throttle situations.

This lamp will also flash when there may be a problem with the automatic transmission. The transmission control module (TCM) performs a continual self diagnosis of certain control functions. The lamp will flash only when an error is detected. The TCM will store in memory a current and/or history trouble code when a problem is detected.

### Windshield Washer Solvent Level Indicator Lamp

The windshield washer solvent level indicator lamp is controlled by the washer solvent level switch. The level switch is located in the washer solvent container. The level switch consists of a floating device and a reed contact that is normally switched to ground when the washer solvent level is greater than 1/3 full. When the washer solvent level goes below the minimum level, the reed contacts open signaling the gauge cluster to ground the indicator bulb.