With KA6
DTC B1925 (With KA6)
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1925 02
Left Seat Cushion Heater Sensor Circuit Short to Ground
DTC B1925 05
Left Seat Cushion Heater Sensor Circuit High Voltage/Open
DTC B2170 02
Right Seat Cushion Heater Sensor Circuit Short to Ground
DTC B2170 05
Right Seat Cushion Heater Sensor Circuit High Voltage/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 rear seat heating 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.
Conditions for Running the DTC
- DTC B1325 must not be present.
- The rear seat heating control module must be powered.
Conditions for Setting the DTC
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.
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 40 consecutive fault-free ignition cycles have occurred.
Reference Information
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
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate E14F or E14H rear seat cushion heating element.
2. Test for less than 10 Ohms between the low reference circuit terminal D and ground.
3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the K29R rear seat heating control module.
4. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
5. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the K29R rear seat heating control module.
6. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit test normal, replace the K29R rear seat heating control module.
7. If all circuits test normal, test or replace the E14 rear seat cushion heating element.
Component Testing
E14F or E14H Seat Cushion Heating Element
1. Ignition OFF, disconnect the harness connector at the appropriate E14F or E14H rear seat cushion heating element.
2. Test for 500 Ohms - 300 Kohms between the signal circuit terminal C and the low reference circuit terminal D.
3. If not within the specified range, replace the E14 rear seat cushion heating element.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Rear Seat Cushion Heater Replacement (40 Percent Seat) Rear Seat Cushion Heater Replacement (60 Percent Seat)
- Control Module References for rear seat heating control module replacement, setup, and programming