Test G: The Heated Seat Is Inoperative/Does Not Operate Correctly - Driver

PINPOINT TEST G: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - DRIVER

Normal Operation
The HVAC module contains the driver heated seat control button and indicator. The heated seat system functions independently from the climate control system. A heated seat relay is located underneath the driver 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 the driver heated seat relay coil when the engine is running. Ground is supplied to the opposite side of the driver relay coil by the HVAC module driver heated seat relay drive circuit CHS29 (WH/BU) when the driver heated seat switch button is pressed to energize the relay. This closes the relay contacts to supply battery voltage from the SJB circuit SBP18 (YE/RD) to the driver heater mat circuit CHS11 (VT/GN). The driver heater mats are directly connected to ground circuit GD182 (BK/GY) completing the electrical circuit to heat the seat. The system will time-out and deactivate after 10 minutes.

- DTC B12AB Drivers Heated Seat Relay Drive Circuit Shorted to Battery Voltage - If the driver heated seat relay drive circuit is shorted to voltage and the HVAC module attempts to activate the driver heated seat relay, the DTC will set and the seat will fail to heat or intermittently heat.
- DTC B12AC Drivers Heated Seat Relay Drive Circuit Open or Shorted to Ground - If the driver heated seat relay drive circuit is open or shorted to ground and the HVAC module attempts to activate the driver heated seat relay, the DTC will set and the seat will fail to heat or intermittently heat.

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

G1:

G2-G4:

G4 Continued:

G5-G6:

G6-G7:

G8-G9:

G10-G11: