Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The heated seat module receives battery voltage on circuit SBP18. The HVAC module supplies a momentary ground signal to the heated seat module on circuit CHS30 to request the system on/off. The heated seat module supplies voltage to the heater mats on circuit CHS07 and ground is supplied on circuit GD139. The heated seat module monitors the temperature sensor on circuit VHS27. If the temperature sensor circuits open, the heated seat module will disable output voltage to the heater mat. The heated seat module control circuits are monitored by the HVAC module and will set a DTC if a circuit fault is detected.

The Front Controls Interface Module (FCIM) (with navigation), HVAC module and heated seat module must be communicating correctly for the system to operate correctly. PIDs are available to check heated seat switch operation in the FCIM (with navigation) and HVAC module (with and without navigation).

Normal heat cycle may require several minutes to initially warm the seat. The seat should be occupied to correctly test for normal operation. Temperature measuring devices do not provide an accurate method for testing heated seat operation as surface temperatures are subject to human and environmental characteristics. Correct testing requires heater mat resistance measurements which have tight tolerances affecting the length of time for the heater mats to reach maximum operating temperature.

DTC B1032:12 (Right Front Seat Heater: Circuit Short To Battery) - If the passenger seat control circuit from the HVAC module to the heated seat module is shorted to voltage, the DTC is set in the HVAC module.
DTC B1032:14 (Right Front Seat Heater: Circuit Short To Ground or Open) - If the passenger seat control circuit from the HVAC module to the heated seat module is shorted to ground or open, the DTC is set in the HVAC module.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Heater feed circuit short to battery, ground or open
Sensor circuit short to battery, ground or open
Heated seat switch stuck closed to ground
Heater mat
Heated seat module
HVAC module
FCIM (if equipped)