Test J: The Heated Seat Is Inoperative - Driver Seat Does Not Heat But The Heated Seat Indicator Illuminates When Pressed

PINPOINT TEST J: THE HEATED SEAT IS INOPERATIVE - DRIVER SEAT DOES NOT HEAT BUT THE HEATED SEAT INDICATOR ILLUMINATES WHEN PRESSED

Normal Operation
The heating ventilation air conditioning (HVAC) module includes the heated seat switch buttons and indicators. The heated seat system will function when the HVAC module is ON or OFF. There is a relay box located behind the headlamp switch area containing 2 micro relays for the driver and passenger heated seats. Battery voltage from circuit 1048 (LB/WH) is supplied to the coil and switch side of the driver heated seat relay. When the ignition switch is ON and the engine running, ground is supplied to the driver heated seat relay coil from the driver heated seat switch in the HVAC to energize the relay. This closes the relay switch supplying voltage to driver seat cushion heater mat from circuit 1064 (YE/LB). The cushion and backrest heater mats are connected in series by circuit 1066 (GN/LB) and ground is supplied to the backrest heater mat circuit 1205 (BK), completing the heater mat circuit to heat the driver seat. If the heated seat switch is on when the ignition switch is turned OFF, the heated seat switch will be on when the ignition switch is turned back ON.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat switch (part of HVAC module)
- Heated seat relay
- Cushion heater mat
- Backrest heater mat

J1:

J1-J3:

J4-J6:

J6-J8: