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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC P1629 >> Circuit/System Description
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Circuit/System Description

The theft deterrent module (TDM) sends the start enable password to the engine control module (ECM) via the serial data circuit. If the start enable password is not received by the ECM in a specified amount of time, the ECM will disable vehicle starting.

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