The Driver Information Center is different in the 1998 and 1999 models from the later years. Those have the common issue of the display going blank and the fix is to re-solder the 2 surface mount resistors (http://forums.edmunds.com/discussion/13879/chevrolet/venture/driver-information-center-repair). If you try to connect one of the later model years DIC you get the no communication (--) issue.
You can try performing a diagnostic self-test of the DIC.
In order to perform the diagnostic self-test and reset the driver information display, simultaneously press the following buttons for at least 2 seconds :
MODE
ENGLISH/METRIC
The reset is acknowledged with the display showing all segments ON for 1 second . You may only reset the following modes. The reset affects all 3 of these modes simultaneously:
AVG ECON
FUEL USED
AVG SPEED
If all of the segments light as described above, but the same symptoms are still present follow these instructions:
Symptom: Driver Information Center (DIC) Always Displays Dashes
1. Check for a poor connection or an open in circuit 800 (Tan wire) between the DIC connector terminal 15 and the Powertrain Control Module (PCM) connector C1 terminal 15.
2. If a problem is found with the circuit in step 1, repair the circuit and retest. Otherwise continue to step 3.
3. Replace the DIC and retest
Actually, the DIC can output fault codes.
Here is a list of the possible fault codes and their descriptions:
E1 - Compass circuitry test error
E2 - Analog to digital test error
E3 - Non-Volitile memory test error
E4 - Vehicle communication error
Please note that if you are getting fault code "E4", this is an indication that you have a communications fault. Circuit 800 (Tan wire) that I instructed you to test is the UART communications circuit between the PCM and the DIC. Communication faults on this circuit will cause the DIC to always display dashes. - which is why I asked you to test this circuit. If you are getting code E4 along with one or more other codes, this code MUST be fixed first.
I have same issue...bought one for a juck yard and displays dashes after 20 seconds or so. Original one still works from time to time but junk yards does as dashes. Does ECM need to learn somehow difference trip comuter?
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The reset thing I did already. I also did a little something else. I powered up the DIC with both buttons pressed and it cycled through some numbers and the like on the display. Can anything be learned from them?
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