Some of the vehicles covered by this manual utilize various maintenance lights in order to let the driver know when it is time to perform certain basic maintenance items. After the service is performed, the light must usually be reset. Please refer to the following information for the proper resetting procedures.
The SERVICE REMINDER portion of the Driver Information Center (DIC) display shows how many miles remain until service is needed. When the RESET button is pressed twice, the type of service and the number of miles remaining until that service is needed, will be displayed. Each time the RESET is pressed, another type of service and the miles remaining for it will be displayed.
With the ignition switch in the RUN , BULB TEST , or START positions, voltage is applied from the ECM fuse through the pink/black wire to the Electronic Control Module (ECM).
As the vehicle is driven, the speed sensor sends electrical pulses to the ECM. The ECM sends a signal to the speed signal input of the DIC module. The DIC module converters the pulses into miles. The module subtracts the miles traveled from the distance remaining for each item of the service reminder.
When the miles remaining for a service approaches zero, that service will be displayed on the DIC display. All 4 types of services can be shown at the same time.
To reset the service light, it will be necessary to subtract the mileage from the service interval light that is illuminated. The miles remaining for a certain type of service can be decreased by holding the RESET button, the miles will be decreased in steps of 500 miles, every 5 seconds. In the first step, the miles will decrease to a multiple of 500. For example, 2,880 miles will decrease to 2,500 miles. If the RESET button is held in and the miles remaining reach zero, the DIC display will shown the service interval for the service selected. The service intervals are as follows:
- Change Oil - 7,500 miles
- Oil Filter Change - 7,500 miles
- Next Filter Change - 15,000 miles
- Rotate Tires - 7,500 miles
- Next Tire Rotation - 15,000 miles
- Tune Up - 30,000 miles
If the RESET button is still held down, the miles will decrease in steps of 500 miles from the service interval. When the RESET button is released, the mile display shown will be the new distance until the service should be performed.
When a service distance reaches zero, the service reminder item will be displayed. If the service interval is reset within 10 miles, the display will go out immediately. If more than 10 miles passes before the service interval is reset, the item will remain displayed for another 10 miles after being reset before going out.
On some models, it may be necessary to depress the SYSTEM RECALL button in order to display the service interval light on the driver information center, in order to be able to decrease the mileage from it to reset the interval light.1991-93 VEHICLES
See Figure 1
The Driver Information Center (DIC) lights up for a few seconds when the ignition is turned ON . To see the entire DIC, press and release the DIC button to the right of the display. The system is divided into 4 main systems: Function Monitor, Lamp Check, Security and Service Reminder. These systems monitor the following:
- Checks windshield washer fluid. Message comes ON when fluid is less than 40 percent full.
- Checks the engine coolant level. Message comes ON when coolant level has fallen to about half full.
- Checks the fuel level. Message comes ON when approximately 2 1 / 2 gallons of fuel remain.
- Checks headlights, turn signal, brake lights and tail lights.
Message comes ON if a problem exists at 1 of the lights. The problem area is indicate on the vehicle outline shown on the DIC. Note that if a burned out bulb is replaced, then warning light will stay on until the bulb is energized or turned on.
- Checks if the doors are fully closed. The problem area is indicated on the vehicle outline shown on the DIC.
- Checks if hood or trunk isn't fully closed.
- Lets vehicle operator know when to have the following service work done: Change engine oil, change oil filter, rotate tire and have engine tune-up.
- The figures at the bottom of the DIC show the number of miles remaining before the work should be done.
To use the service reminder, you must first decide which service items to check. For example, if you want to knock when to next rotate the tires, push and hold the DIC button until the SERVICE REMINDER light comes ON. Then, push and release the DIC button until ROTATE TIRES appears. The number at the bottom then shows how many miles there are to go before the tires should be rotates.
To reset the service reminder, push the DIC until the service item desired appears and do not release the button. In 5-10 seconds the display will start to count down, 500 miles at a time. When the display reads the distance you wish to set, release the button. Note that sometimes a service reminder display will stay ON even though it has been reset, but the reminder should go OFF after the vehicle has been driven about 10 miles.1994-99 VEHICLES
Vehicles equipped with an ENGINE OIL LIFE INDEX , the display located on the Driver Information Center (DIC). The PCM determines approximately when the engine oil should be changed by calculating information based on vehicle speed, coolant temperature and engine RPM. Once the PCM determines it is time to change the engine oil, it will illuminate the CHANGE OIL SOON light on the DIC. This indicates the remaining oil life is below 10% (not to be confused with oil level). On a new vehicle or one that has been reset, the oil life is 100%. This percentage will slowly decrease based on the inputs the PCM receives. When oil life reaches the 0% mark, the PCM will illuminate the CHANGE OIL NOW light on the DIC. At this time, both messages will be displayed accompanied by a slow 5 second audible chime. The reset button must be pressed to acknowledge each of these messages. If a steady CHANGE OIL SOON light persists, this indicates a diagnostic trouble code has been set, specifying a possible shorted switch.
Remaining oil life percentage can be displayed by pressing the OIL button on the DIC and advancing through the messages until the oil life index is displayed. The oil life index will not detect abnormal conditions such as excessively dust or engine malfunctions that could otherwise affect the engine oil life.
After the engine oil has been changed, display the oil life index on the DIC, then hold the RESET button for at least 5 seconds. When a DIC message of RESET is displayed and the oil life index equals 100%, the reset is complete.Buick LeSabre
After the engine oil has been changed, the Engine Oil Monitor must be reset. The reset button is located in the glove compartment. Reset as follows:
- With the ignition key in the RUN position, push the reset button, hold it in for at least 5 seconds but not more than 60 seconds.
- The CHANGE OIL SOON light will flash 4 times and then go off. This indicates that the Oil Life Monitor System has been reset.
For information on these vehicles, please refer to the procedure for 1994-99 Pontiac Bonnevilles.Oldsmobile Delta 88
Vehicles equipped with an ENGINE OIL LIFE INDEX display as part of the DRIVER INFORMATION SYSTEM (DIS) , have a display that will show when to change the engine oil.
The oil change interval is determines by the DIS and will usually fall at or between the 2 recommended intervals of 3,000 and 7,500 miles, but it could be shorter than 3,000 miles under some severe driving conditions. The DIS will also signal the need for an oil change at 7,500 miles or 1 year passed since the last oil change. If the DIS does not indicate the need for an oil change after 7,500 miles or one year or if the ENGINE OIL LIFE INDEX display fails to appear, the oil should be changed and the driver information system serviced.
When the ENGINE OIL LIFE INDEX reaches 10 percent or less, the CHANGE OIL light display will function as a reserve trip odometer (indicating the distance to an oil change). Until the ENGINE OIL LIFE INDEX reset is performed, the driver information system will display the distance to the oil change and sound a beep when the ignition switch is turned to the ACCESSORY or RUN position the first time each day.
When the distance to the next oil change reaches zero, the driver information system will display the CHANGE OIL NOW light. Until an ENGINE OIL LIFE INDEX reset is performed, the driver information system will display the CHANGE OIL NOW light and sound a beep when the ignition switch is turned to the ACCESSORY or RUN position at the beginning of each day.
The driver information system will not detect dusty conditions or engine malfunctions which may affect the engine oil. If driving in severe conditions exist, be sure to change the engine oil every 3,000 miles or 3 months, whichever comes first, unless instructed otherwise by the driver information system. The driver information center does not measure the engine oil level. It still remains your responsibility to check the engine oil level. After the oil has been changed, the ENGINE OIL LIFE INDEX light must be reset. Resetting is performed as follows:
- The ENGINE OIL LIFE INDEX can be reset by pressing the RESET and OIL buttons simultaneously for at least 5 seconds on the ENGINE OIL LIFE INDEX display. The driver information system will reset the ENGINE OIL LIFE INDEX to 100 percent and display an index of 100 percent.
Vehicles which are equipped with a Drivers Information Center (DIC) and have an Oil Life Index, will require the Oil Life Indicator to be reset after each oil change.
Press the SEL to select OIL . Press SEL if necessary to display the oil life. The display will show a reading of the estimated oil life left. Example: OIL LIFE 85%. When the remaining oil life is 9% or less, the display will show CHANGE OIL SOON . Then, a tone will sound and the CHANGE OIL SOON message will display each time the vehicle is started.
When the oil life is zero, a tone will sound and the display will show, CHANGE OIL NOW . Then, when the vehicle is started a tone will sound and the CHANGE OIL NOW message will display each time the vehicle is started. Reset the Oil Life Display as follows:
- Acknowledge all diagnostic messages in the Drivers Information Center (DIC) by pressing RESET .
- Press the SEL button on the left to select OIL . Press the SEL button on the right if necessary to display oil life.
- Press and hold the RESET button for about 5 seconds. Once the oil life index has been reset, a RESET message will be displayed and then oil life will change to 100%.
Be careful not to reset the oil life accidentally at any time other than when the oil has just been changed. It cannot be reset accurately until the next oil change.