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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P15B9 or P15BA: Electric A/C Compressor Control Module Ignition On/Start Switch Circuit >> Circuit/System Description

Circuit/System Description

The body control module (BCM) controls the ignition main relay through the control circuit by applying voltage to the run/crank coil circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Ignition ON/Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the transmission control module (TCM).

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