2010 Cadillac CTS Sedan AWD V6-3.6L Page 455

2010 Cadillac CTS Sedan AWD V6-3.6L Page 455

DTC B2170 05

- Right Seat Heater Cushion Sensor Circuit Short to Battery or Open

Diagnostic Fault Information

Circuit/System Description

The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat

heating element. The memory seat module (MSM) supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground

through the low reference circuit to the sensor. The module monitors the voltage of the sensor signal circuit to determine the temperature of the

seat. The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat

reaches the set temperature, the module will then cycle the control circuit of the heating elements ON and OFF in order to maintain the desired seat

temperature based on the feedback voltage from the sensor.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

B1925 02, B2170 02

The temperature sensor voltage drops below 0.8 V for more than 1 second.

B1925 02, B2170 05

The temperature sensor voltage is greater than 5 V for more than 1 second.

Action Taken When the DTC Sets

The heated seat function for the affected seat will be disabled.

Conditions for Clearing the DTC

* The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to normal operating range and the ignition

is cycled OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics (See: Body and Frame/Seats/Seat Temperature Element/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation