Chevrolet Sonic Repair Manual: Immobilizer

Ignition Lock Cylinder Replacement

Removal Procedure Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection. Remove the upper trim cover and the lower trim cover f ...

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 ...

Other materials:

Automatic Door Locks
The vehicle is programmed so that when the doors are closed, the ignition is on, and the shift lever is moved out of P (Park) for automatic transmissions, or when the vehicle speed is above 13 km/h (8 mph) for manual transmissions, the doors and the trunk/liftgate will lock. To unlock the doo ...

Data Link Communications Description and Operation
Note: This is an overview of different serial data buses used by GM devices to communicate with each others. Use Data Communication Schematics to find out which serial data buses are configured for a specific vehicle. Circuit Description There are many components in a vehicle t ...

Camshaft Timing Chain Replacement
Special Tools EN-955 Locking Pin For equivalent regional tools. Refer to Special Tools. Removal Procedure Remove the engine front cover. Refer to Engine Front Cover with Oil Pump Replacement. Note: If EN-955 fixing pin can not be inserted, compress the ti ...