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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 L: The Heated Seat is Inoperative - 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.

The heated seat module is supplied battery voltage and switched ignition voltage on circuits 1048 (LB/WH) and 1040 (RD/BK). The heated seat is activated when the heated seat switch supplies a ground signal to one of 2 input circuits into the heated seat module. Input circuits 581 (RD) and 1020 (DG/VT) activate the system hi or off. Input circuits 1256 (WH/YE) and 1255 (WH/RD) activate the system to low or off. Once activated, the heated seat module supplies voltage and ground to the heater mat circuits 1064 (YE/LB) and 1065 (WH/LB) to heat the seat cushion and backrest. The heated seat module monitors circuits 1060 (BK/LB) and 1061 (BN/LB) from the temperature sensor in the cushion heater mat to maintain the seat temperature. The system will remain on until the module times-out or is switched off.

This pinpoint test is intended to diagnose the following:

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