Circuit/System Description
The front seat heating elements are controlled by a common high current relay internal to the heated seat module (HSM) and on the low side by
individual element control circuits. The HSM connects the seat heater element supply voltage circuits to a common reference point. This reference
point is biased to approximately 2.5 V. Before the HSM will allow heated seat operation, it checks to see if the heating element supply voltage
circuits and control circuits are shorted to ground or battery voltage. Once the HSM verifies that it is not closing to a shorted heating element, it
allows heated seat operation. After which it continues to monitor for a shorted circuit.
Conditions for Running the DTC
The HSM must be powered.
Conditions for Setting the DTC
B2508 02
Before the heated seats are activated, the HSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.
B2508 01
Before the heated seats are activated, the HSM detects a short to battery voltage on the seat heating element supply voltage circuit or control circuit.
Action Taken When the DTC Sets
The heated seat function for both seats 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.
