LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hummer >> 2008 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 573 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1629 >> Circuit/System Description
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

Circuit/System Description

WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

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.

scientia non olet · About LEMON Manuals