Test O: The Heated Seat Is Inoperative/Does Not Operate Correctly - Front Passenger

PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - FRONT PASSENGER

Normal Operation
The heated seat module receives ignition voltage feed on circuit CBP35 (YE/GY), battery voltage feed on circuit SBB22 (BN/RD) and is supplied ground on circuit GD148 (BK/YE). When ignition switched power is supplied and the driver heated seat button on the heating ventilation and air-conditioning (HVAC) module is pressed, a momentary ground signal is sent to the heated seat module on circuit CHS30 (GY/YE) to command the system on or off. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is high, low, off, high, etc.). The heated seat module supplies voltage to the cushion and backrest heater mats on circuit CHS07 (GY/BU). Ground to the heater mats is provided on circuit GD148 (BK/YE). The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by 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 RHS05 (YE/VT) and monitors the signal from the temperature sensor on circuit VHS27 (WH/OG) 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 or a 10-minute time-out period occurs.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heater mat
- Heated seat module
- EATC

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