DTC P1630 Theft Deterrent Learn Mode Active. Buick GL7 (Export) 2000

For 1990-2009 cars

### Circuit Description

If the theft deterrent module has been replaced, the password must be relearned. If the powertrain control module (PCM) is replaced, the replacement PCM should learn the password within a few seconds when the ignition is turned ON. DTC P1630 is an information code indicating that the PCM is ready to learn the theft deterrent password. The engine will start and continue to run with DTC P1630 set. Refer to Vehicle Theft Deterrent (VTD)Circuit Description and Vehicle Theft Deterrent (VTD) Operation in Theft Deterrent.

### Conditions for Running the DTC

• | The theft deterrent system has allowed fuel delivery.

• | The PCM is in the Theft Deterrent Password Learn mode.

### Conditions for Setting the DTC

The PCM remains in the Theft Deterrent Password Learn mode for more than 2 seconds.

### Action Taken When the DTC Sets

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

### Conditions for Clearing the MIL/DTC

• | The DTC becomes history when the conditions for setting the DTC are no longer present.

• | The history DTC clears after 40 malfunction free warm-up cycles.

• | The PCM receives a clear code command from the scan tool.

### Diagnostic Aids

A new replacement PCM will be in a functional state to learn the password from the theft deterrent module . If the theft deterrent module is replaced, the PCM must be placed in the Password Learn mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of battery or ignition voltage to the PCM will not affect the programmed password information.

#### DTC 1630 Theft Deterrent Learn Mode Active

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent | Go to Powertrain On Board Diagnostic (OBD) System Check