Circuit/System Description
The driver and front passenger heated seat heating elements are controlled by a common high current relay internal to the memory seat module
(MSM) and the low side by individual element control circuits. The MSM connects the heated seat heater element supply voltage circuits for both
seats to a common reference point. This reference point is biased to approximately 2.5 V. Before the MSM will allow heated seat operation, it
checks to see if this reference voltage is shorted to ground or battery voltage. Once the MSM 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 MSM must be powered.
Conditions for Setting the DTC
B2508 02
Before the heated seats are activated, the MSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.
