Test F: The Heated Seats Are Inoperative

PINPOINT TEST F: THE HEATED SEATS ARE INOPERATIVE

Normal Operation
The HVAC module contains the heated seat control buttons and indicators. The heated seat system functions independently from the climate control system. A heated seat relay is located underneath each heated seat cushion frame. There are 2 voltage supplies to the heated seat relay. Voltage is supplied from the smart junction box (SJB) heated seat relay enable circuit CBP43 (GY) to each heated seat relay coil when the engine is running. Ground is supplied to the opposite side of the driver or passenger relay coil by HVAC module driver heated seat relay drive circuit CHS29 (WH/BU) or passenger heated seat relay drive circuit CHS30 (GY/YE) when a heated seat switch button is pressed to energize the affected relay. This closes the relay contact to supply battery voltage from SJB circuit SBP18 (YE/RD) to the driver heater mat circuit CHS11 (VT/GN) or passenger heater mat circuit CHS12 (YE/GN). The driver and passenger heater mats are directly connected to ground circuit GD182 (BK/GY) completing the electrical circuit to heat the seats. The system will time-out and deactivate after 10 minutes.

This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- HVAC module

F1-F2:

F3-F4:

F5-F6: