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9G-14 Seats:
DTC B1925 or B2170
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC B1925 02: Left Seat Cushion Heater Sensor Circuit Shorted to Ground
DTC B1925 05: Left Seat Cushion Heater Sensor Circuit Shorted to Battery or Open
DTC B2170 02: Right Seat Cushion Heater Sensor Circuit Shorted to Ground
DTC B2170 05: Right Seat Cushion Heater Sensor Circuit Shorted to Battery or Open
Diagnostic Fault Information
Circuit
Driver Heated Seat Element Control
Driver Heated Seat Element Supply Voltage
Driver Heated Seat Temperature Sensor
Low Reference
Driver Heated Seat Temperature Sensor
Signal
Passenger Heated Seat Element Control
Passenger Heated Seat Element Supply
Voltage
Passenger Heated Seat Temperature
Sensor Low Reference
Passenger Heated Seat Temperature
Sensor Signal
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 heated seat module supplies a 5-volt
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.
Short to
Open/High
Ground
Resistance
B2345 00
B2425 0C
B2508 02
B2345 00
B2425 0C
B2508 02
B1925 05
—
B2425 1F
B1925 05
B1925 02
B2425 1F
B2345 00
B2430 0C
B2508 02
B2345 00
B2430 0C
B2508 02
B2170 05
—
B2430 1F
B2170 05
B2170 02
B2430 1F
Conditions for Running the DTC
The heated seat module must be powered.
Conditions for Setting the DTC
B1925 02, B2170 02
The temperature sensor voltage drops below 0.8 volt for
more than 1 second.
B1925 02, B2170 05
The temperature sensor voltage is greater than 5 volts
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.
Signal
Short to Voltage
Performance
B2345 00
B2508 01
B2345 00
B2508 01
—
B1925 05
B2425 1F
B2345 00
B2508 01
B2345 00
B2508 01
—
B2170 05
B2430 1F
—
—
—
—
—
—
—
—
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Troubleshooting
