Circuit Description

The body control module (BCM) uses a key in ignition input in order to control certain features in the vehicle. These features are in the following systems:

• Content Theft Deterrent (if equipped)
• Audible Warnings
• Automatic Door Locks

The key in ignition input circuit is grounded when you fully insert the ignition key into the ignition switch. This in turn pulls the BCM key in ignition input low.