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:

Immobilizer Light
The immobilizer light should come on briefly as the engine is started. If it does not come on, have the vehicle serviced by your dealer. If the system is working normally, the indicator light turns off. If the light stays on and the engine does not start, there could be a problem with the i ...

Crankshaft and Bearing Cleaning and Inspection
Special Tools EN-45059 Torque Angle Sensor Kit GE-571-B Dial Gauge For equivalent regional tools, refer to Special Tools. Crankshaft End Play, Check Note: Crankshaft attached with crankshaft bearing caps. Install the GE-571-B gauge  (1). ...

Automatic Transmission Flex Plate Removal
Special Tools EN-652 Automatic Transmission Flex Plate Holder For equivalent regional tools, refer to Special Tools. Install the EN-652 holder  (1) to hold the automatic transmission flex plate (2). Loosen the 6 automatic transmission flex plate bolts. Re ...