B2425

DTC B2425 or B2430

Circuit Description

The driver and passenger seat heaters are controlled by the driver seat module (DSM). Power is supplied to the driver seat cushion and back heater elements through individual voltage supply circuits. Power is supplied to the passenger seat cushion and back heater elements through a common voltage supply circuit. All of the driver and passenger seat heater elements are grounded by the DSM through individual low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the DSM in order to control the seat temperatures by regulating the current flow through the heater elements.

Conditions for Running the DTC

The system voltage must be between 9-16 volts.

Conditions for Setting the DTC

The DSM determines by monitoring the heater element control circuits that a short to voltage, short to ground, or open condition exists.

Action Taken When the DTC Sets

- The heated seat with a current status DTC will be disabled.
- Both heated seats may be disabled.
- When the fault is no longer present a history status DTC will be stored.

Conditions for Clearing the DTC

- The DTC will be current for as long as the fault is present.
- When the fault is no longer present the DTC will be a history status code.
- The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.