Circuit Description
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
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.