Door Ajar Warning Indicator - Operation

OPERATION

The ajar indicators give an indication to the vehicle operator that one or more of the passenger compartment doors, the hood, the liftgate or the liftgate flip-up glass may be open or not completely latched. These indicators are controlled by the instrument cluster logic circuit based upon cluster programming and hard wired inputs received by the cluster from the door, liftgate and liftgate flip-up glass ajar switches as well as from electronic hood ajar switch status messages received over the Controller Area Network (CAN) data bus from the Front Control Module (FCM).

The ajar indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused B(+) circuit. Therefore, the OLED ajar indications can occur regardless of the ignition switch position. The instrument cluster will turn ON an ajar indicator for the following reasons:

- Ajar Switch Input or Status Message - Each time the cluster receives a door, liftgate or liftgate flip-up glass ajar switch input indicating that a door, the liftgate or the liftgate flip-up glass or any combination of these is open or not completely latched with the ignition switch in any position, the appropriate ajar textual message and icons will be illuminated. A hood ajar indication happens only with the ignition switch in the ON or START positions. If the cluster detects a vehicle speed input greater than zero (kilometers or miles-per-hour) while the ignition switch is in the ON or START positions, the ajar indication will be accompanied by a single chime tone. When the ignition switch is in any position except ON or START, any and all ajar indications will time out after about five minutes.

The instrument cluster continually monitors the door, liftgate and liftgate flip-up glass ajar switches to determine the status of the doors, liftgate and liftgate flip-up glass. The FCM continually monitors the status of the hood ajar switch, then sends the proper electronic hood ajar switch status message to the instrument cluster, also known as the Cab Compartment Node (CCN).

For proper diagnosis of the door, hood, liftgate and liftgate flip-up glass ajar switches and circuits, the FCM, the CCN, the CAN data bus or the electronic communication related to ajar indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.