Circuit Description
The theft deterrent system is incorporated within the Body Control Module (BCM). If the BCM has been replaced, the password must be relearned using approved Techline diagnostic equipment. If the PCM is replaced, the replacement PCM should learn the password within a few seconds after 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 System for further information regarding the theft deterrent system.
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 theft deterrent password learn mode for greater than 2 seconds.
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear Info function. |
Diagnostic Aids
A new replacement PCM will be in a functional state to learn the password from the BCM. If the BCM is replaced, the PCM must be placed in password learning mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage will not affect the programmed password information.
Refer to Theft Deterrent System Check in Electrical Diagnosis for information concerning the password learning procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic System Check performed? | -- |
