For 1990-2009 cars only
The audio amplifier activates the door ajar audible warning as requested by the instrument panel cluster (IPC). The IPC sends a serial data message to the radio indicating the chime frequency. The door ajar warning sounds and the door ajar message is displayed in the driver information center (DIC) when the following occurs:
| • | The IPC determines that the driver door is open and the signal circuit is low. The IPC also displays the appropriate door ajar message in the DIC. |
| • | The vehicle is not in PARK. The IPC receives a serial data message from the body control module (BCM) indicating the gear position. |
