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Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Information Center - Instrumentation, Message Center, And Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AX: The TRUNK AJAR Message Is Inoperative/Always On >> Normal Operation

Normal Operation

The Instrument Panel Cluster (IPC) receives the trunk ajar status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus. The luggage compartment lid ajar switch (part of the luggage compartment lid latch) is hardwired to the SJB through the trunk ajar input circuit. The luggage compartment lid ajar switch is grounded externally. When the luggage compartment lid is ajar, the luggage compartment lid latch removes the ground to the luggage compartment lid ajar switch input to the SJB. When the luggage compartment lid is closed, the luggage compartment lid release grounds the luggage compartment lid ajar switch.

When the SJB detects an open on the trunk ajar input circuit, the SJB sends a message to the IPC to turn on the TRUNK AJAR message in the message center.

This pinpoint test is intended to diagnose the following: 

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