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Chevrolet Sonic Repair Manual: Immobilizer System Component Programming

Chevrolet Sonic Repair Manual / Accessories / Security & Keyless Entry / Immobilizer / Immobilizer System Component Programming

This procedure will learn the immobilizer function. If the battery voltage is low, charge the battery before proceeding with the learn. If the body control module (BCM) or engine control module (ECM) have been replaced, they must be programmed before performing this learn procedure.

Depending on the immobilizer function being learned or the component replaced, different learn functions are required to be performed. These learn functions are as follows:

Immobilizer System Component Programming

Function name on SPS tool:

Function description:

When the function should be used:

Notes:

Body Control Module IMMO Function with Existing Transponder or Remote Key

The BCM will relearn the immobilizer passwords and data while reusing the existing vehicle keys

The BCM has been replaced and the existing vehicle keys are being reused or a diagnostic has instructed to perform the learn

Body Control Module IMMO Function with New Transponder or Remote Key

The BCM will relearn the immobilizer passwords and data while using new vehicle keys

The BCM has been replaced and new vehicle keys are being reused

Engine Control Module IMMO Learn

The ECM will relearn the immobilizer passwords and data

The ECM has been replaced or a diagnostic has instructed to perform the learn

Engine Control Module and Body Control Module IMMO Learn

The ECM and BCM will learn new immobilizer passwords and data

Both the ECM and BCM have been replaced (this selection will REQUIRE new vehicle keys be used)

Because both the ECM and BCM have been replaced and are learning new immobilizer passwords and data, all vehicle keys must also be replaced

Program Transponder or Remote Key (Add)

A new vehicle key will learn the immobilizer passwords and data

A new vehicle key is being added (does not affect other vehicle keys)

This function may not be available in all sales regions. Refer to the SPS application to determine if a particular vehicle is able to add keys using this method.

Program Transponder or Remote Key (Delete)

All existing vehicle keys will be invalidated and any desired keys are relearned

All vehicle keys are desired to be invalidated and certain keys relearned or a diagnostic has instructed to perform the learn

This procedure may be used if a customer has had their keys lost or stolen and wishes to invalidate the keys, making them unable to start the vehicle

Immobilizer Description and Operation
The immobilizer system functions are provided by the body control module (BCM) and the engine control module (ECM), as well as any modules which store and report the environment identifier. When ...

Key with Integrated Transmitter Programming
Keys can be programming in various ways using the procedures outlined below. Using the Replacing Keys procedures will first erase all the known keys from the vehicle. Any existing keys and any new ...

Other materials:

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