B2435

DTC B2435 OR B2440

CIRCUIT DESCRIPTION
The driver seat module (DSM) relies on inputs from thermistors located in the driver and passenger seat backs to control heated seat temperatures. The thermistors are 2 wire sensors supplied with a 5-volt referenced signal circuit and low reference circuit from the seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to decrease as the seat back temperatures rise.

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 7-16 volts.

CONDITIONS FOR SETTING THE DTC
- The heated seat sensor signal circuit voltage to the seat module is greater than 4.94 volts for 30 seconds or more.
- The heated seat sensor signal circuit voltage to the seat module is less than 0.07 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, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Testing for Intermittent Conditions and Poor Connections

TEST

Step 1 - Step 12:

Step 13 - Step 16: