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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 I: The Power Lumbar is Inoperative - Driver >> 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.

The lumbar control switch is supplied battery voltage on circuit 517 (BK/WH). When the lumbar control switch is toggled in one direction, battery voltage is applied directly to a compressor in the seat backrest lumbar assembly from circuit 1094 (PK). The lumbar compressor is directly connected to ground from circuit 57 (BK). When voltage is applied to the compressor motor from the lumbar control switch, air is pumped into the lumbar bladder expanding the backrest foam pad. Toggling the switch to the opposite position applies voltage to a solenoid valve coil in the compressor from circuit 1097 (BN) to release air from the lumbar bladder and the backrest foam pad relaxes.

This pinpoint test is intended to diagnose the following:

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