GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The instrument cluster performs an internal test in order to determine the integrity of its operation.

Conditions for Setting the DTC

The instrument cluster is unsuccessful at verifying its operation.

Action Taken When the DTC Sets

    • The instrument cluster stores DTC B1000 in memory.
    • The SERVICE VEHICLE SOON indicator turns on.

Conditions for Clearing the DTC

    • Under all fault conditions, the ignition switch must be cycled from the on position to the off position, and back to the on position before this DTC can change from current to history.
    • A history DTC will clear after 100 drive cycles if the condition for this DTC is no longer present.
    • Using a scan tool

Diagnostic Aids

DTC B1000 is an internal instrument cluster malfunction. No repair procedure exists for this malfunction, replace the instrument cluster. Refer to Instrument Cluster Replacement .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Always perform the Instrument Cluster Diagnostic System Check before attempting to diagnose this DTC.

  2. This diagnostic procedure requires using a scan tool.

  3. This repair procedure requires instrument cluster replacement.

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Using a scan tool, clear the instrument cluster DTC and recheck for DTC B1000.

Does DTC B1000 reset?

--

Go to Step 3

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.1L or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.8L

3

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

System OK

Go to Diagnostic System Check - Instrument Cluster