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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC P0633 >> Circuit/System Description

Circuit/System Description

Do NOT replace the control module if DTC P0633 is set.Security Controller In Learn ModeLearn Key(s) A current DTC will be cleared after a successful learn mode.

For an overview of the component/system, refer to: Immobilizer Description and Operation 

Component Description
K9 Body Control Module Depending on the version, the control module can support different functions:
  • Immobilizer Function
  • Horn
  • Central Door Locking
  • Power Mode Control
  • Ignition Key/Shifter Interlock

The control module also reads various switches and sensors and makes their values available via serial data.
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.