Ajar Indicators

The ajar indicators give an indication to the vehicle operator that one or more of the passenger compartment doors or the deck lid may be open or not completely latched. These indicators are controlled by a transistor on the IC circuit board based upon programming and electronic messages received by the IC from the Body Control Module (BCM) over the CAN data bus. The BCM monitors hard-wired inputs from the door and deck lid ajar switches.

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

• Ajar Indicator Lamp-On Message  - Each time the IC receives an electronic door ajar indicator lamp-on  or deck lid ajar indicator lamp-on  message from the BCM indicating that a door or the deck lid or a combination of these is open or not completely latched, the appropriate ajar textual message and icons will be illuminated. If the IC detects a vehicle speed input greater than zero (kilometers or miles-per-hour) while the ignition switch status is ON or START, the ajar indication will be accompanied by a single chime tone. When the ignition switch status is anything except ON or START, any and all ajar indications will time out after about five minutes.

The ajar switches on the door and deck lid latch mechanisms provide hard-wired ground inputs to the BCM circuitry through the ajar switch sense circuits whenever a door or the deck lid is open or not completely latched. The BCM continually monitors the door and deck lid ajar switches to determine the status of the doors and deck lid, then sends the proper electronic ajar indicator lamp-on  or lamp-off  message to the IC.

The hard wired ajar switch inputs to the BCM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. For proper diagnosis of the BCM, the IC, 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.