P1630

Circuit Description
This diagnostic tests for the Enable Password Learning Flag indicating the PCM is in learn password mode. This mode allows the PCM to learn the password from the Body Control Module (BCM) at assembly or when serviced. The password needs to be learned whenever the PCM or the BCM is replaced or if a replacement ignition key that has a different resistance is used.

Conditions for Running the DTC
The PCM is ready to learn a new password from the BCM.

Conditions for Setting the DTC
The BCM is not sending a valid password or not sending a password at all.

Action Taken When the DTC Sets
^ The engine starts and stalls when the BCM detects a theft mode.
^ The engine starts and stalls when the PCM losses communication with the BCM.
^ The engine operates normally, but an internal BCM failure has occurred.
^ The PCM stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The PCM records the operating conditions at the time during which the diagnostic fails. The PCM stores this information in the Failure Records.

Conditions for Clearing the MIL/DTC
^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
^ A DTC 1630 is a code used at the assembly plant, dealership, or repair facility which indicates that the system has enabled the learn mode. This means that the PCM is now ready to learn a new password from the BCM. This DTC sets because the BCM never sent a valid password to the PCM while in the learn mode. When this occurs, the vehicle is vulnerable to vehicle theft.
^ For an intermittent condition, refer to Symptoms. Symptom Related Diagnostic Procedures