B2435
DTC B2435
CIRCUIT DESCRIPTION
The heated seat switch and a heat sensor located in the seat cushion are connected in series and provide a single input to the driver seat module (DSM). A 5-volt reference voltage is supplied to the heated seat switch from the driver seat module. When the heated seat switch is in the high or low positions voltage is supplied through one of the internal resistors to the switch signal circuit. The heated seat switch signal circuit is grounded through the seat heat sensor which is a temperature sensitive variable resistor. The heated seat switch signal circuit input to the driver seat module is spliced from the circuit between the switch and the heat sensor, where the voltage level is determined by the resistance of both components.
DTC DESCRIPTORs
This diagnostic procedure supports the following DTCs:
- DTC B2435 Driver Seat Back Heater Sensor Circuit
- DTC B2440 Passenger Seat Back Heater Sensor Circuit
CONDITIONS FOR RUNNING THE DTC
Battery voltage to the seat module must be within 8-17 volts.
CONDITIONS FOR SETTING THE DTC
- The heated seat sensor signal circuit voltage to the seat module is greater than 5 volts for 30 seconds or more.
- The heated seat sensor signal circuit input to the seat module indicates that the desired seat temperature has not been reached within 34 minutes after activation.
ACTION TAKEN WHEN THE DTC SETS
The heated seat with a current status DTC will be disabled.
CONDITIONS FOR CLEARING THE DTC
- The DTC will be stored as a history code when the fault is no longer present.
- A history DTC will be cleared after completing 100 consecutive ignition cycles, or by using the scan tool clearing DTCs feature.
DIAGNOSTIC AIDS
If the DTC is only found in history and the heated seat is operating normally, the fault may be intermittent.
TEST
