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Hood Ajar Indicator/Message Malfunction > < DTC B2955

Astra J

DTC P1630

Diagnostic Instructions

    •  Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    •  Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P1630 00:  Immobiliser Learn Mode Active Malfunction

Circuit/System Description

The body control module (BCM) sends the security code to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. When learning security code, the engine control module is placed in learn mode. The DTC will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the security code is learned, learn mode will be exited and the DTC cleared. If the engine control module does not exit learn mode, P1630 will remain current and indicate a fault. The instrument cluster security indicator will turn ON and the driver information center will display a message.

Conditions for Running the DTC

The ECM is in immobiliser learn mode.

Conditions for Setting the DTC

DTC P1630 will set any time the ECM enters the immobiliser learn mode.

Action Taken When the DTC Sets

The security indicator will illuminate. The driver information centre will display a message.

Conditions for Clearing the DTC

    •  A current DTC will be cleared upon the successful exit of learn mode.
    •  A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Reference Information

Schematic Reference

Immobiliser Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobiliser Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Note:  Because of normal system communications between the BCM and ECM, any immobiliser B-codes must be diagnosed prior to the diagnosis of P-codes. See Diagnostic Trouble Code List.

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Perform the Immobiliser Relearn procedure. Refer to Immobiliser System Component Programming . The ECM should successfully complete the password learn and the vehicle should start.

⇒ If the ECM does not complete the learn or vehicle starting remains disabled, replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

Hood Ajar Indicator/Message Malfunction > < DTC B2955