Test P: The Heated Seat Is Inoperative - Passenger

PINPOINT TEST P: THE HEATED SEAT IS INOPERATIVE - PASSENGER

Normal Operation
The heated seat module receives ignition voltage on circuit CBP19 (BN/WH), battery voltage on circuit SBB11 (BU/RD) and is supplied ground on circuit GD139 (BK/YE). When ignition switched voltage is supplied and the passenger heated seat button on the heating ventilation air conditioning (HVAC) module is pressed, a momentary ground signal is sent to the heated seat module on circuit CHS30 (GN/YE) 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 on circuit CHS07 (GY/BU). Ground to the heater mats is provided on circuit GD139 (BK/YE). 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 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.

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

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P18: