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Dealer Installed




DTC B2425 or B2430 (Dealer Installed)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC B2425 04
- Left Seat Heater Cushion Circuit Open

DTC B2425 0A
- Left Seat Heater Cushion Circuit Rate of Change Below Threshold

DTC B2425 0B
- Left Seat Heater Cushion Circuit Current Above Threshold

DTC B2425 0C
- Left Seat Heater Cushion Circuit Current Below Threshold

DTC B2425 0D
- Left Seat Heater Cushion Circuit Resistance Above Threshold

DTC B2425 0E
- Left Seat Heater Cushion Circuit Resistance Below Threshold

DTC B2425 1F
- Left Seat Heater Cushion Circuit Intermittent

DTC B2430 04
- Right Seat Heater Cushion Circuit Open

DTC B2430 0A
- Right Seat Heater Cushion Circuit Rate of Change Below Threshold

DTC B2430 0B
- Right Seat Heater Cushion Circuit Current Above Threshold

DTC B2430 0C
- Right Seat Heater Cushion Circuit Current Below Threshold

DTC B2430 0D
- Right Seat Heater Cushion Circuit Resistance Above Threshold

DTC B2430 0E
- Right Seat Heater Cushion Circuit Resistance Below Threshold

DTC B2430 1F
- Right Seat Heater Cushion Circuit Intermittent

Diagnostic Fault Information





Circuit/System Description

When the heated seat function is active, the heated seat module (HSM) supplies battery voltage through the element supply voltage circuit to the seat heater elements. The HSM controls the seat temperature by providing a pulse width modulated (PWM) ground through the heated seat element control circuit to the seat heater elements. The HSM then monitors the current flow through the heating element and the temperature sensor rate of change to verify correct operation.

Conditions for Running the DTC

The HSM must be powered and the heated seat must be enabled.

Conditions for Setting the DTC

B2425 04 or B2430 04

The HSM does not detect a temperature change within 210 seconds.

B2425 0A or B2430 0A

The HSM detects that the set point temperature has not been reached within 8.5 minutes.

B2425 0B, B2425 0E, B2430 0B, or B2430 0E

By measuring output current, the HSM calculates that the heating element resistance is below the minimum resistance.

B2425 0C, B2445 0D, B2430 0C, or B2430 0D

By measuring output current, the HSM calculates that the heating element resistance is above the maximum resistance.

B2425 1F or B2430 1F

The temperature sensor voltage is erratic or changes suddenly.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

* The current DTC clears when the malfunction is no longer present , and the power mode changes to 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 ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Heated Seats Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

B2425 0A, B2425 0B, B2425 0C, B2425 0D, B2425 0E, B2425 04, or B2425 1F
1. Ignition OFF, disconnect the X1 harness connector at the HSM.

Important: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.


2. Test for 2.0 - 8.0 Ohms between control circuit terminal 3 and control circuit terminal 5.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heater element.
• If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal replace the seat cushion heater element.

3. Disconnect the X2, X4 harness connectors at the HSM.
4. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 9 X4 and the low reference circuit terminal 6 X2.

• If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat cushion heater element/temperature sensor.
• If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion heater element/temperature sensor.

5. Connect the X1, X2, X4 harness connectors at the HSM.
6. Disconnect the harness connector at the seat cushion heater element/temperature sensor.
7. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
• 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 HSM.

8. If all circuits test normal, replace the HSM.

B2430 0A, B2430 0B, B2430 0C, B2430 0D, B2430 0E, B2430 04, or B2430 1F
1. Ignition OFF, disconnect the X1 harness connector at the HSM.

Important: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.


2. Test for 2.0 - 8.0 Ohms between control circuit terminal 6 and control circuit terminal 2.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heater element.
• If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat cushion heater element.

3. Disconnect the X2, X4 harness connectors at the HSM.
4. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 20 X4 and the low reference circuit terminal 8 X2.

• If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat cushion heater element/temperature sensor.
• If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion heater element/temperature sensor.

5. Connect the X1, X2, X4 harness connectors at the HSM.
6. Disconnect the harness connector at the seat cushion heater element/temperature sensor.
7. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.

• 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 HSM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.

8. If all circuits test normal, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Cushion Heater Replacement (Driver or Passenger Seat Cushion Heater Replacement)
* Control Module References (Programming and Relearning) for the HSM replacement, setup, and programming

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