Diagnostic Instructions

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	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
B+ MSM Terminal 5 X3	1, B2425 0D, B2430 0D	1, B2425 0D, B2430 0D	--	--
Driver Heated Seat Element Supply Voltage	B2508 02	B2425 0D	B2508 01	B2425 0E
Driver Heated Seat Element Control	B2508 02	B2425 0D	B2508 01	B2425 0E
Driver Heated Seat Temperature Sensor Signal	B1925 02	B1925 05	B1925 05	B2345 13, B2345 42, B2345 4B
Driver Heated Seat Temperature Sensor Low Reference	--	B1925 05	--	B2345 13, B2345 42, B2345 4B
Passenger Heated Seat Element Supply Voltage	B2508 02	B2430 0D	B2508 01	B2430 0E
Passenger Heated Seat Element Control	B2508 02	B2430 0D	B2508 01	B2430 0E
Passenger Heated Seat Temperature Sensor Signal	B2170 02	B2170 05	B2170 05	B2345 13, B2345 42, B2345 4B
Passenger Heated Seat Temperature Sensor Low Reference	--	B2170 05	--	B2345 13, B2345 42, B2345 4B
1. Power seats inoperative

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

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

Scan Tool Reference

Control Module References 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 greater than the specified range, replace the seat back heating element.

⇒	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.

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

⇒	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.

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

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

⇒	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.

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 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.

⇒	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.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.