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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test C: The Power Seat Does Not Move Horizontally/Vertically - Passenger >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

When pressed in 1 of 6 available directions, the seat control switch supplies battery voltage and ground to 1 of 3 seat track assembly motors through horizontal motor circuits 986 (YE/WH) and 987 (RD/WH), front height motor circuits 984 (YE/LB) and 985 (RD/LB) or rear height motor circuits 988 (YE/LG) and 989 (RD/LG). The seat control switch is normally closed to ground on all 6 of the seat motor circuits, so if one circuit becomes closed to voltage, the circuit on the opposite side of the same motor is still closed to ground. The seat motor will then operate, moving the seat track in the selected direction. Moving the seat control switch in the opposite direction reverses polarity to the seat motor, which causes the seat motor to move the seat track in the opposite direction.

This pinpoint test is intended to diagnose the following:

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