Instrument Panel, Gauges and Warning Indicators: Description and Operation
NOTE: Before doing any diagnostics, always per the following QUICK SELF-TEST.
QUICK SELF-TEST
1. While simultaneously depressing all three CCA switches, turn ignition to RUN.
2. To verify test mode, new numbers will appear in the speedometer and odometer windows.
3. If any CCA symbol is flashing, replace the cluster. NOTE: MCCA symbols may flash; this is NORMAL which in RUN with engine OFF for steps 1-3.
4. To leave test mode, turn ignition to OFF.
The Electronic Instrument Cluster consists of an Electronic Instrument Module (EIM) and a conventional feature section. the conventional section includes turn signal indicators and a high beam indicator.
The Electronic Instrument Cluster consists of four separate components: the CCA, the MCCA, the ISO indicators and PRNDL. The CCA includes the digital speedometer, odometer, fuel gauge and bar type multigauge. The MCCA includes warning indicators and trip minder features. The ISO indicators include turn, high beam, seat belt and brake indicators, and displays the position of transmission select lever.
Electronic Digital Fuel Level Indicator
The Fuel gauge Sender unit is similar to the conventional sender unit except that its resistance ranges from about 15 ohms at empty to about 160 ohms at full.
The Electronic Digital Fuel Level Indicator shows tank level in three ways; digitally in gallons or liters, on a bar graph, and with a pump symbol.
When the Ignition Switch is turned from OFF to RUN, a 3 second display test begins.
- First, all segments light and flash.
- Next, all segments go off.
- Finally, the current fuel level is displayed.
When less than 2 gallons (8 liters) is indicated on the fuel indicator display, the fuel pump symbol flashes ON and OFF at a rate of once per second as an indication of low fuel. The flashing continues until the Ignition Switch is turned to OFF or until sufficient fuel is added to display a quantity of 1 or more gallons on the indicator. At fuel levels less than 2 gallons, an "E" is displayed with the flashing pump signal. When nearing zero fuel, the "E" will flash with the pump symbol as an empty alert.
The Electronic Digital Fuel Level Indicator also provides fuel level indication signals to the Message Center.
Digital Speedometer
The Digital Electronic Speedometer displays vehicle speeds from 0 to 85 mph or 199 km/h. Vehicle speeds exceeding the maximum limits are indicated by the maximum indication. Vehicle speed is displayed whether the vehicle is moving forward or backward. The selection of mph or km/h is selected by pressing the English/Metric button located on the CCA switches. The mode last selected will be displayed when the Ignition Switch is turned from OFF to RUN. In case of power disconnect, mph is automatically selected.
When the Ignition Switch is moved from OFF to RUN, the Electronic Speed Indicator will begin a 3-second display prove-out.
- First, all segments light.
- Next, all segments turn OFF.
- Finally, 0 mph or 0 km/h in indicated until vehicle movement begins.
Speed information is provided by a transaxle mounted speed sensor via circuit 679 (GY/BK). The speed information is also supplied to the EIC and the Cruise Control Amplifier.
Electronic Odometer
The Electronic Odometer displays accumulated miles or kilometers and is capable of displaying from "000000.0" to "999999.9."
When "999999.9" is exceeded, the display will rollover to "000000.0."
The mileage is stored in the Non-Volatile Memory Module. It will retain the memory even if the battery is disconnected.
When the Ignition Switch is turned from OFF to RUN, a display prove-out sequence begins.
- First, all segments light.
- Next, all segments turn OFF.
- Finally, the current mileage is displayed in miles or kilometers.
Message Center
The Message Center is in the Digital Cluster and displays trip minder features and various warning indications on the Message Center screen. The Cluster Control Assembly (CCA) Module provides the input for the Message Center Control Assembly (MCCA) Display and provides an output signal to operate the Warning Chime when a message center warning is displayed.
The inputs for the Message Center Display are received by the CCA Module from other modules as well as individual sensors. The EIC is powered through Fuse 16.