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B2425




DTC B2425 or B2430

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 0D
- Left Seat Heater Cushion Circuit Resistance Above Threshold

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

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

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

Diagnostic Fault Information





Circuit/System Description

The driver and front passenger heated seats are controlled by the memory seat module (MSM) that is located under the driver seat cushion. When the heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.

Conditions for Running the DTC

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

Conditions for Setting the DTC

B2425 0D, B2430 0D

By measuring current and voltage output to the seat heating elements every 10 seconds, the MSM calculates that the heating element resistance is above the maximum resistance.

B2425 0E, B2430 0E

By measuring current and voltage output to the seat heating elements every 10 seconds, the MSM calculates that the heating element resistance is below the minimum resistance.

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 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 (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Heated/Vented Seat 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 0D or B2425 0E
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the X3 harness connector at the MSM and disconnect the harness connector at the seat back heating element.
4. Test for 1.7 - 7.0 Ohms between the control circuit terminal A and control circuit terminal B.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heating element.
• If greater than the specified range, replace the seat back heating element.

5. Connect the harness connector at the seat back heating element and disconnect the X1 harness connector at the MSM.

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

6. Test for 1.7 - 7.0 Ohms between the control circuit terminal 6 and control circuit terminal 11.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heating 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 heating element.

7. If all circuits test normal, replace the MSM.

B2430 0D or B2430 0E
1. Ignition OFF, disconnect the X3 harness connector at the MSM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the X3 harness connector at the MSM and disconnect the harness connector at the seat back heating element.

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

4. Test for 1.7 - 7.0 Ohms between the control circuit terminal A and control circuit terminal B.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat back heating element.
• If greater than the specified range, replace the seat back heating element.

5. Connect the harness connector at the seat back heating element and disconnect the X1, X4 harness connectors at the MSM.
6. Test for 1.7 - 7.0 Ohms between the control circuit terminal 14 X1 and the control circuit terminal 14 X4.

• If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heating 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 heating element.

7. If all circuits test normal, replace the MSM.

Repair Instructions

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

* Driver or Passenger Seat Back Cushion Heater Replacement (KA1) (Driver or Passenger Seat Back Cushion Heater Replacement (KA1))
* Driver Seat Cushion Heater Replacement (KA1) (Driver Seat Cushion Heater Replacement (KA1))
* Passenger Seat Cushion Heater Replacement (KA1) (Passenger Seat Cushion Heater Replacement (KA1))
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming

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