For 1990-2009 cars

### Circuit Description

The instrument cluster performs an internal self - test when the ignition switch is turned on in order to determine the integrity of the instrument cluster.

### Conditions for Running the DTC

The ignition switch is turned from OFF to ON.

### Conditions for Setting the DTC

The DTC sets under any of the following conditions:

• | The internal supply voltage is out of range for more than 10 seconds.

• | An EEPROM checksum error exists.

### Action Taken When the DTC Sets

The SERVICE VEHICLE SOON indicator illuminates.

### Conditions for Clearing the DTC

• | A current DTC B1000 will clear when the malfunction is no longer present and the ignition switch is cycled.

• | A history DTC will clear if the condition for this DTC is no longer present after 100 ignition cycles.

### Diagnostic Aids

Since DTC B1000 is an internal instrument cluster malfunction, replace the instrument cluster.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Instrument Cluster Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster
2 | Replace the instrument cluster. Refer to Instrument Cluster Replacement . Did you complete the replacement? | System OK | --