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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1995 (Seat System - Seats) >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test Q: The Heated Seats are Inoperative - Front >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The heated seat module receives ignition voltage on circuit CBP35 (YE/GY), battery voltage on circuit SBB16 (VT/RD) and is supplied ground on circuit GD133 (BK). When ignition switched voltage is supplied and the driver or passenger heated seat button on the HVAC module is pressed, a momentary ground signal is sent to the heated seat module to command the system ON or OFF. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is hi, lo, OFF, hi, etc.). The heated seat module supplies voltage to the cushion and backrest heater mats, which are connected in series and operate together. A separate ground to the heater mats is provided on the backrest heater mat. Temperature is maintained by the heated seat module using a sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor and monitors the return signal from the temperature sensor for controlling current flow to the heater mats. The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF from the HVAC module or the ignition switch is turned OFF.

This pinpoint test is intended to diagnose the following: 

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