DTC B3031 Key Decoder Device in Assem Learn Mode. Buick GL7 (Export) 2000

For 1990-2009 cars

### Schematic

Refer to Theft Deterrent System Schematics .

### Circuit Description

The vehicle theft deterrent (VTD) module checks memory to see if the Learn Coded Key setting is on. If so, the VTD sets this DTC.

### Conditions for Running the DTC

The VTD must see the ignition switch input.

### Conditions for Setting the DTC

If the Learn Coded Key setting is on, the VTD sets this DTC.

### Action Taken When the DTC Sets

The VTD will learn the key code. The driver warning message will be displayed for this DTC.

### Conditions for Clearing the MIL/DTC

The VTD clears the current status of the DTC when it does not see the Learn Coded Key setting as on. The DTC will still be retrieved as current until the ignition switch is cycled. The DTC will become a history DTC at that time.

### Test Description

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

1. To set this code, a key with a working transponder was read by the VTD (Pass Key III®) Module. For that key to operate the vehicle a 10 Minute or 30 Minute Re-Learn Procedure must be performed.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform A Diagnostic System Check - Vehicle Theft Deterrent? | Go to Step 2 | Go to Diagnostic System Check - Theft Deterrent

2

Important: If a 10 Minute or 30 Minute Re-Learn Procedure is performed, all keys not learned at that time will be erased and will not be recognized. Perform the Programming Additional Keys Procedure on all keys or instruct the customer how to perform the Programming Additional Keys Procedure. Refer to Programming Additional Keys .

Perform the VTD (Pass Key III®) Module learn Procedure. Refer to Programming Replacement Keys, Ignition Cylinder, or Powertrain Control Module .

Is the procedure complete?

Go to Step 3

--

3

1. Use a scan tool in order to clear the DTCs.
2. Attempt to start the vehicle.

Does the DTC reset?

Go to Step 2

System OK