Battery positive voltage (B+) is applied at all times to the LH front heated seat module via CKT 2440 (ORN) from the rear junction block HTDST LF Fuse. The LH front heated seat module is grounded via CKT 550 (BLK) to G302. The LH front heated seat switch is grounded via CKT 350 (BLK) to G200. Battery positive voltage (B+) is applied at all times to the RH front heated seat module via CKT 2540 (ORN) from the HTDST RF Fuse. The RH front heated seat module is grounded via CKT 650 (BLK) to G302. The RH front heated seat switch is grounded via CKT 350 (BLK) to G200. Battery positive voltage (B+) is applied to each front heated seat module ignition input via CKT 41 (BRN) from the IGN 3 RR Fuse with the ignition switch in the ON position. The heated seats will operate only with the ignition switch in the ON position.

Each front heated seat is controlled by a separate heated seat switch. When the front heated seat switch is pressed, the front heated seat module heated seat switch input is momentarily grounded via CKT 1501 (PNK) (LH) or CKT 1503 (PNK/BLK) (RH) and the front heated seat switch contact. The front heated seat module then applies or removes battery positive voltage (B+) to the front heated seat heating elements. The front heated seat module monitors the seat surface temperature through a thermistor and maintains a pre-determined temperature.

When the heated seat is off and the front heated seat switch is pressed once, the front heated seat module will set the heated seat temperature to HIGH. The front heated seat module supplies battery positive voltage (B+) via CKT 1661 (DK GRN) (LH) or CKT 1685 (YEL) (RH) to the front heated seat switch high heat LED. When pressed again, the heated seat temperature is then set to LOW. The front heated seat module supplies battery positive voltage (B+) via CKT 1662 (LT BLU) (LH) or CKT 1686 (TAN) (RH) to the front heated seat switch low heat LED. After the third press of the front heated seat switch, the front heated seat module removes battery positive voltage (B+) to the front heated seat heating elements. The front heated seat module will also turn off the heated seat whenever the ignition switch has been turned to the OFF position.

Battery positive voltage (B+) is applied at all times to the LH rear heated seat module via CKT 2640 (ORN) from the rear junction block HTDST LR Fuse. Battery positive voltage (B+) is applied at all times to the RH rear heated seat module through CKT 2740 (ORN) from the HTDST RR Fuse. Both rear heated seat modules are grounded via CKT 750 (BLK) to G301. Battery positive voltage (B+) is applied to each rear heated seat module ignition input via CKT 41 (BRN) from the IGN 3 RR Fuse with the ignition switch in the ON position. The heated seat will operate only with the ignition switch in the ON position.

Each rear heated seat is controlled by a separate heated seat switch. The LH rear heated seat switch is grounded via CKT 551 (TAN/WHT) to the LH rear door module (LRDM). The RH rear heated seat switch is grounded via CKT 451 (BLK/WHT) to the RH rear door module (RRDM). When the rear heated seat switch is pressed, the rear door module heated seat switch input is momentarily grounded via CKT 1637 (BRN) (LH) or CKT 1634 (BRN) (RH) and the rear heated seat switch contact. In response to this input, the rear door module sends a simple bus interface (SBI) message to the RH front door module (RFDM) indicating that the appropriate rear heated seat needs to be activated. In response to this message, the RFDM sends a class 2 message to the rear integration module (RIM) indicating that the rear heated seat needs to be activated. In response to this message, the RIM momentarily grounds the rear heated seat module heated seat switch input via CKT 1617 (PNK) (LH) or CKT 1629 (BRN) (RH). The rear heated seat module then applies or removes battery positive voltage (B+) to the rear heated seat heating elements. The rear heated seat module monitors the seat surface temperature through a thermistor and maintains a pre-determined temperature.

When the heated seat is off and the rear heated seat switch is pressed once, the rear heated seat module will set the heated seat temperature to HIGH. The rear door module supplies battery positive voltage (B+) via CKT 1638 (BLK/WHT) (LH) or CKT 1635 (BLK/WHT) to the rear heated seat switch high heat LED. When pressed again, the heated seat temperature is then set to LOW. The rear door module supplies battery positive voltage (B+) via CKT 1631 (PNK) (LH) or CKT 1636 (PNK) (RH) to the rear heated seat switch low heat LED. After the third press of the rear heated seat switch, the rear heated seat module removes battery positive voltage (B+) to the rear heated seat heating elements. The rear heated seat module will also turn off the heated seat whenever the ignition switch has been turned the OFF position.

The ON/OFF status of the front heated seats is reported to the rear integration module (RIM) via CKT 181 (LT BLU/WHT). The RIM inhibits heated seat function for all heated seats via CKT 182 (YEL) according to the level of load management. During Load Shed 0, the RIM leaves CKT 182 (YEL) open so that each heated seat module a high level at the inhibit input. During Load Shed 1, the RIM will cycle the signal from high to low every 0.25 seconds. During Load Shed 2, the RIM will supply a constant ground via CKT 182 (YEL) to the heated seat modules. All heated seats are turned off during Load Shed 2 and the front heated seat module or rear door module will deactivate the appropriate LED.