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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Seat System - Seats >> Diagnosis And Testing >> Seats >> Pinpoint Tests >> Pinpoint Test O: The Heated Seat is Inoperative - Left Rear >> Normal Operation

Normal Operation

The Smart Junction Box (SJB) supplies battery voltage to the rear heated seat module on circuit SBP18 (YE/RD), ignition voltage is supplied from the SJB on circuit CPB35 (YE/GY) and ground on circuit GD145 (BK/BU). When the heated seat control switch is pressed, a ground signal is sent to the heated seat module to command the system ON or OFF in HIGH heat mode or LOW heat mode. When commanded ON, a ground signal is supplied from the heated seat switch to the heated seat module on either circuit CHS48 (YE) (HIGH heat mode) or circuit CHS49 (VT) (LOW heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit CHS39 (GN/BU) and ground to the heater mats on circuit GD145 (BK/BU). The cushion and backrest heater mats are connected in series and operate together. 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 on circuit VHS42 (GN) and monitors the return signal from the temperature sensor on circuit RHS41 (GN/BN) for adjusting the current flow to the heater mats. The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF.

This pinpoint test is intended to diagnose the following: 

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