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 relearn the password within a few seconds after the ignition is turned on. The engine will start and continue to run with DTC P1630 set. Refer to Vehicle Theft Deterrent System for further.
Conditions for Setting the DTC
| • | The Theft Deterrent system has allowed fuel delivery. |
| • | The PCM is in the theft deterrent password learn mode. |
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 Fail 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. |
| • | DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
A new replacement PCM will be in a functional state to learn the password from the Body Control Module. If the Body Control Module 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 Systems for information concerning the password learning procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On Board Diagnostic (OBD) System Check performed? | -- | Go to the Theft Deterrent Systems |
