DTC B1925 or B2170 (With Memory A45)
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DTC B1925 or B2170 (With Memory A45)
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DTC B1925 02
Driver Seat Cushion Heater Sensor Circuit Short to Ground
DTC B1925 05
Driver Seat Cushion Heater Sensor Circuit High Voltage/Open
DTC B2170 02
Passenger Seat Cushion Heater Sensor Circuit Short to Ground
DTC B2170 05
Passenger Seat Cushion Heater Sensor Circuit High Voltage/Open
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Seat Memory Control Module B+ Terminal 5 X4
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B242A 02, B2425 0D, B2430 0D, 1, 2
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B242A 02, B2425 0D, B2430 0D, 1, 2
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-
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-
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Driver Heated Seat Element Control Terminal 11 X3
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B242A 02
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B2425 0D
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B242A 01
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B2425 0B, B2425 0E
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Driver Heated Seat Element Control Terminal 6 X3
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B242A 02
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B2425 0D
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B242A 01
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B2425 0B, B2425 0E
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Driver Heated Seat Temperature Sensor Signal
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B1925 02
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B1925 05
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B1925 05
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B2345 13
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Driver Heated Seat Temperature Sensor Low Reference
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-
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B1925 05
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-
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B2345 13
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Passenger Heated Seat Element Control Terminal 10 X3
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B242A 02
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B2430 0D
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B242A 01
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B2430 0B, B2430 0E
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Passenger Heated Seat Element Control Terminal 4 X3
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B242A 02
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B2430 0D
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B242A 01
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B2430 0B, B2430 0E
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Passenger Heated Seat Temperature Sensor Signal
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B2170 02
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B2170 05
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B2170 05
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B2345 13
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Passenger Heated Seat Temperature Sensor Low Reference
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-
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B2170 05
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-
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B2345 13
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1. Power seats inoperative
2. Heated seats inoperative
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Circuit/System Description
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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 seat memory control module 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.
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Conditions for Running the DTC
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•
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DTC B1325 must not be present.
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•
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The seat memory control module must be powered.
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Conditions for Setting the DTC
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B1925 02 or B2170 02
The temperature sensor voltage drops below 0.6 V for more than 1 second.
B1925 05 or B2170 05
The temperature sensor voltage is greater than 5 V for more than 1 second.
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Action Taken When the DTC Sets
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The heated seat function for the affected seat will be disabled.
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Conditions for Clearing the DTC
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•
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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.
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•
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The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.
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Schematic Reference
Heated/Cooled Seat Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Heated/Vented Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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1.
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Ignition OFF, disconnect the harness connector at the appropriate E14B or E14D seat cushion heating element.
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2.
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Test for less than 10 Ω between the low reference circuit terminal D and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the K40 seat memory control module.
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4.
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Ignition ON, press a power seat switch in order to wake up the module. Test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
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5.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K40 seat memory control module.
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6.
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If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K40 seat memory control module.
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7.
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If all circuits test normal, test or replace the E14 seat cushion heating element.
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E14B or E14D Seat Cushion Heating Element
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1.
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Ignition OFF, disconnect the harness connector at the appropriate E14B or E14D seat cushion heating element.
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2.
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Test for 500 Ω - 300 kΩ between the signal circuit terminal C and the low reference circuit terminal D.
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3.
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If not within the specified range, replace the E14 seat cushion heating element.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
