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Home >> Cadillac >> 2007 >> XLR Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Ignition Switch/Steering Lock >> Wiring Systems And Power Management - Introduction >> Description and Operation >> Power Mode Description and Operation >> Serial Data Power Mode >> PCM and TCM Power Mode Backup Strategy
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PCM and TCM Power Mode Backup Strategy

The PCM and TCM remain in the last known power mode state until it can determine its backup system power mode based on their discrete Accessory/Wake up and Run/Crank signal inputs.

PCM and TCM Power Mode Backup Strategy

Accessory/Wake Up Signal State Run/Crank Signal State Power Mode Determined
Inactive Inactive Off
Active Inactive Accessory
Active Active Run
Inactive Active Crank
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