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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Starter Solenoid Clicks, Engine Does Not Crank >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the engine control module (ECM)/powertrain control module (PCM) that crank has been requested. The ECM/PCM then verifies that the transmission is in Park or Neutral. If it is, the ECM/PCM then supplies a ground to the control circuit of the STARTER/CRANK relay. When this occurs, battery voltage is supplied through the switch of the STARTER/CRANK relay to S terminal of the starter solenoid.

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