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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Information Center - Instrument Cluster (Ic), Message Center, & Warning Chimes) >> Diagnostic Tests >> Instrument Cluster (IC), Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AK: The Headlamps On Warning Chime Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

When the key is inserted into the ignition lock cylinder, the key-in-ignition switch (part of the ignition switch) closes and routes a voltage signal to the instrument cluster (IC) through circuit 1414 (LG/VT). When the ignition key is not inserted into the ignition lock cylinder, the driver door is ajar and the headlamps are on, the smart junction box (SJB) sends a message to the instrument cluster (IC) over the medium speed controller area network (MS-CAN). The instrument cluster (IC) interprets this signal and sounds the headlamps on warning chime.

This pinpoint test is intended to diagnose the following:

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