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Home >> Buick >> 2004 >> Rainier 5.3 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System - 4.2L (Introduction)) >> Description and Operation >> Throttle Actuator Control (TAC) System Description >> Modes of Operation >> Battery Saver Mode
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Battery Saver Mode

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If the powertrain control module (PCM) detects the ignition ON for 10 seconds without the engine running, the PCM will allow the throttle blade to return to the default position. This removes the draw that is present while holding the throttle blade at the calculated idle position.