B2430

DTC B2425 or B2430

Diagnostic Instructions

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

Both, the driver and front passenger heated seats are controlled by the memory seat module 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 memory seat module must be powered and the heated seat must be enabled.


Conditions for Setting the DTC

B2425 0D and B2430 0D

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

B2425 0E and B2430 0E

By measuring current and voltage output to the seat heating elements every 10 seconds, the memory seat module 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 (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Testing


B2425 Left Seat Heater Circuit
1. Ignition OFF, disconnect the harness connector at the seat back heating element.
2. Test for less than 5.0 ohms between the control circuit terminal A and the control circuit terminal B.

• If greater than the specified range, replace the seat back heating element.

3. Connect the harness connector at the seat back heating element.
4. Disconnect the X1 harness connector at the memory seat module.
5. Test for less than 5.0 ohms between the control circuit terminal 6 and the control circuit terminal 11.

• 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.

6. If all circuits test normal, replace the memory seat module.



B2430 Right Seat Heater Circuit
1. Ignition OFF, disconnect the harness connector at the seat back heating element.
2. Test for less than 5.0 ohms between the control circuit terminal A and the control circuit terminal B.

• If greater than the specified range, replace the seat back heating element.

3. Connect the harness connector at the seat back heating element .
4. Disconnect the X1, X4 harness connectors at the memory seat module.
5. Test for less than 5.0 ohms between the control circuit terminal 14 X1 and the control circuit terminal 14 X4.

• 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.

6. If all circuits test normal, replace the memory seat module.



Repair Instructions

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

* Driver Seat and Passenger Seat Back Cushion Heater Replacement (Driver Seat and Passenger Seat Back Cushion Heater Replacement)
* Driver Seat and Passenger Seat Cushion Heater Replacement (Driver Seat and Passenger Seat Cushion Heater Replacement)
* Control Module References (Programming and Relearning) for memory seat control module replacement, setup, and programming