Test T: The Heated Seats Are Inoperative - Front

PINPOINT TEST T: THE HEATED SEATS ARE INOPERATIVE - FRONT

T1:

T1-T3:

T3-T5:

T6:

Normal Operation
The heated seat module receives ignition voltage feed on circuit CBP35 (YE/GY), battery voltage feed on circuit SBB16 (VT/RD) and is supplied ground on circuit GD133 (BK). When ignition switched power is supplied and the driver or passenger heated seat button on the electronic automatic temperature control (EATC) 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 EATC module or the ignition switch is turned OFF.

Possible Causes
An inoperative heated seat can be caused by:
- an open fuse.
- wiring, terminals or connectors.
- a faulty heated seat module.