B2170

DTC B1925 OR B2170

CIRCUIT DESCRIPTION
The heated seat temperature sensor that set this DTC is located in the seat cushion just under the seat cover with the seat heating element. The body control module (BCM) supplies a 10-volt signal circuit and a low reference circuit to the sensor. The BCM monitors the voltage of the heated seat temperature sensor signal circuit to determine the temperature of the seat. The BCM will then cycle the heated seat relay ON and OFF in order to maintain the desired seat temperature based on the voltage feedback from the temperature sensor.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC B1925 Seat Heater Sensor Circuit
- DTC B2170 Seat Heater Sensor

CONDITIONS FOR RUNNING THE DTC
- The BCM must be powered and cannot have B1327, Battery Voltage Low, as an active DTC for this DTC to set.
- The heated seat system must be active.
- The module voltage must be 9-16 volts.

CONDITIONS FOR SETTING THE DTC
The BCM detects that the signal circuit of the temperature sensor signal circuit is either too high or too low.

ACTION TAKEN WHEN THE DTC SETS
- The BCM will turn OFF the heated seat operation.
- Current and history codes are set.

CONDITIONS FOR CLEARING THE DTC
The current DTC will clear whenever the diagnostic feedback to the BCM indicates that the fault no longer exists and the ignition switch is turned OFF and then back ON again.

TEST DESCRIPTION

Step 1 - Step 13:

Step 14:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for the proper operation of the circuit in the high voltage range.
4. This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.