Test U: The Heated Seat Is Inoperative/Does Not Operate Correctly - Left Rear

PINPOINT TEST U: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT REAR

Normal Operation
The heated seat module receives battery voltage on circuit CBP35 (YE/GY) and ignition voltage on circuit SBB05 (GY/RD), and is supplied ground on circuit GD133 (BK). When the left rear heated seat control switch is pressed with the ignition switch in RUN or START, a ground is supplied on circuit CHS46 (YE/GN) to command the system on or off in high heat mode or circuit CHS47 (VT/GN) to command the system on or off in low heat mode. When commanded on, voltage is supplied to the heated seat switch from 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 GD147 (BK/VT). 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 monitors the temperature sensor on circuit VHS42 (GN) for adjusting the current flow to the heater mats and uses a ground supplied on circuit RHS41 (GN/BN). The heated seat module is designed to remain on, heating the seat and maintaining temperature until switched off or the ignition power is switched OFF.

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

U1-U2:

U3-U5:

U5-U7:

U7-U8:

U9-U10:

U11-U13:

U13-U14:

U15-U17: