Diagnostic Instructions
Circuit/System Description
The driver and passenger heated seats are controlled by separate heated seat switches. Both switches are located in the climate control panel (CCP). When a heated seat switch is pressed, the CCP sends a serial data message to the heated seat module (HSM)
indicating the heated seat request. In response to this signal, the HSM activates the heated seat by applying battery voltage to the seat heating elements. The HSM then sends a serial data message back to the CCP commanding it to illuminate the appropriate seat
temperature indicator.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Heated Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
Ignition ON, use a scan tool to observe the appropriate HVAC Control Module heated seat switch parameter listed below while pressing the heated seat switch. The reading should change between Inactive and Active.
| ⇒ | If not the specified value, replace the HVAC control module. |
| ⇒ | If the readings change between Inactive and Active, the heated seat is inoperative, and there are NO DTCs set, replace the HSM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for HVAC control module and HSM replacement, setup, and programming
