Trip Computer

I have a 98 Olds Bravada that has a trip computer mounted on the headliner. It has two buttoms, one for US/Metric and the other Mode. When you go thru the Mode selections, is there a way to Zero out some
of the displays? If I am going on a trip, it would be nice to start the miles/gallon and miles driven to start anew.
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Here's some info from the service manual that may be useful to you:
Document ID# 387748 1998 Oldsmobile Bravada --------------------------------------------------------------------------------
Driver Information Center (DIC) or Message Center Circuit Description Trip Mode Display The driver information center (DIC) calculates and displays the following vehicle parameters:
Average Fuel Economy Instant Fuel Economy Trip Range Fuel Used Average Speed Only one of the above parameters is displayed at a time.
The user may change the parameter displayed by depressing the MODE button on the display face.
The user may change the display units from English to Metric by pressing the E/M button on the display face.
The DIC performs error detection where possible (no serial data stream for 10 seconds or an open circuited fuel level sender). If the DIC is unable to calculate a value due to a missing speed signal, the DIC will display an E when any of the following functions are selected:
AVG ECON INST ECON AVG SPEED In the absence of vehicle communications, the DIC will display a double dash - - in the digits section. The display format for each mode is indicated in the following table.
Driver Information Center Display Format Parameter Update Range Range Reset Value Units
Instant Fuel Economy 1 second 0-99 -- MPG or L/100 km
Average Fuel Economy 2 seconds 0.0-99.9 0.0 MPG or L/100 km
Average Speed 2 seconds 0.0-999 0.0 MPH or km/h
Fuel Used 0.1 gallon/liter 0.0-999 0.0 G or L
Trip Range 8 seconds 40-999
LO<43 -- Miles or km
Reset Operation In order to reset the driver information display, press the following buttons simultaneously for at least 2 seconds:
The MODE button The ENGLISH/METRIC button The reset is acknowledged when the display shows all segments ON for about 1 second.
Only the following modes may be reset:
AVG ECON FUEL USED AVG SPEED A reset will affect all 3 modes simultaneously.
Average Economy The average fuel economy (AFE) is calculated as the ratio between the accumulated distance since the last AFE reset and the accumulated fuel consumption since the last AFE reset (Distance/Fuel Used). After a trip reset, the AFE will zero out the accumulated distance and the accumulated fuel consumption. The driver information display will retain the AFE information when the ignition switch is in the OFF position.
Instant Fuel Economy Instantaneous fuel economy is the ratio between the accumulated distance gathered for the last 1 second and the accumulated fuel used for the last 1 second. This mode may not be reset. The value is not retained when the ignition switch is in the OFF position.
Range Range is calculated as the product of the average fuel economy (AFE) multiplied by the amount of fuel remaining in the tank (AFE x Remaining Fuel). When a range of less than 40 miles is calculated, the low fuel range mode is entered. During the low fuel range mode, the numeric display will show LO. A reset will not have any effect while in range mode. If the AFE is reset, range will not be affected until about 3 hours of new AFE data is obtained.
Fuel Used The driver information center calculates and displays the total amount of fuel used since the last FUEL USED reset. Fuel used is the amount of fuel used since the last reset, accumulated from liters or fuel over real time converted to gallons or liters as required. Press the MODE and the ENGLISH/METRIC buttons simultaneously while in the FUEL USED display in order to reset the FUEL USED accumulator to zero. The value of the fuel is retained when the ignition switch is in the OFF position.
Average Speed Average speed is the ratio of the accumulated distance over accumulated ignition on-time. Both values are calculated since the last average speed reset. On-time is measured from the time when the ignition switch is turned to the ON position to when the ignition switch is turned OFF of all of the ignition cycles since the last reset. Press the MODE and the ENGLISH/METRIC buttons simultaneously in order to reset the average speed to zero. The value of the average speed is retained when the ignition switch is in the OFF position.
Compass Display The compass display circuitry is entirely contained within the driver information center. Refer to Navigation Systems in order to initiate the compass self-calibration function or to set the variance.
Temperature Display The driver information center applies voltage to the ambient air temperature sensor. The ambient air temperature sensor is a thermistor.
As temperature increases, the resistance decreases.
As temperature decreases, the resistance increases.
As the resistance of the ambient air temperature sensor increases, the driver information center senses a larger voltage reduction across the ambient air temperature sensor. This condition indicates a lower temperature.
As a resistance of the ambient air temperature sensor decreases, the driver information center senses a smaller voltage reduction across the ambient air temperature sensor. This condition indicates a higher temperature.
If the temperature is below 3C (38F), the temperature digits will toggle between displaying the outside temperature and ICE for 2 minutes. This condition will occur once per ignition cycle.
The driver information center uses the vehicle speed signal from the vehicle control module in order to determine when to update the temperature display with a new outside air temperature reading. The vehicle must be driven more than 16 km/h (10 mph) before the temperature display will be updated. For more information on temperature display operation, refer to Driver Information Center (DIC) or Message Center Description .
Dimming Control Display dimming for the trip calculator will follow the radio dimming characteristics. When the park lamps are activated, the display will step dim to the maximum brightness in the dim mode. Further dimming will be controlled by the IP dimming control. The display will turn blank when the dimming control is moved to the lowest dimming request.
-------------------------------------------------------------------------------- Document ID# 387748 1998 Oldsmobile Bravada

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