Refer to Engine Controls Schematics .
Circuit Description
The vehicle theft deterrent system is designed to prevent vehicle theft by disabling the engine unless the lock cylinder is correctly engaged by a mechanical key. The theft deterrent system utilizes four components for theft detection, the lock cylinder, ignition switch, the body function controller (BFC) and the Powertrain Control Module (PCM).
When starting the engine, the PCM looks for a password from the BFC through the Class II serial data circuit. If the password is not recognized or not present, the PCM will disable the engine. There are 2 modes of tamper detection:
| • | No password received. The engine will start and stall quickly. The THEFT SYSTEM telltale will flash on the instrument panel cluster (IPC). |
| • | Incorrect or disable password received (more than 3 invalid passwords are received). The engine is disabled for at least 10 minutes and the THEFT SYSTEM telltale will illuminate solid on the IPC for the 10 minutes. |
After the vehicle has passed theft detection, the PCM will continue normal engine operation. Additional information can be found 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 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 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 Body Control Module (BCM) Programming/RPO Configuration for information concerning the password learning procedure.
If the BFC is replaced the PCM must be reflashed to allow the new password to be learned. The ignition must be turned off for at least 30 seconds and then on for the PCM to learn the new BFC password.
DTC P1630 Theft Deterrent Learn Mode Active
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent |
