Lights On Warning
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The audio amplifier activates the lights on warning as requested by the instrument panel cluster (IPC). The IPC sends a serial data message to the audio amplifier indicating the chime frequency and duration. The lights on warning sounds when the following occurs:
- The ignition is OFF.
- The body control module (BCM) determines that the driver door is open and the signal circuit is low.
- The BCM determines that the headlamp switch is in the park or head position.