B1333

DTC B1333 Right Heater Discharge Sensor Fault:

CIRCUIT DESCRIPTION
The right heater temperature sensor is a thermistor that controls signal voltage to the Instrument Panel Integration Module (IPM). The IPM applies voltage on circuit 520. When the sensor is cold, the resistance is high and the IPM will sense a high signal voltage at terminal B9, connector C2. When the sensor warms, resistance is reduced and the signal voltage is pulled low through circuit 61. Signal voltage will vary from 5 V (open circuit) to 0 V (short circuit).

CONDITIONS FOR SETTING THE DTC
^ The ignition is ON.
^ Circuit open or short.

ACTION TAKEN WHEN THE DTC SETS
^ A default value of 128 counts and 24°C (75°F) will be used by the IPM.
^ The default value allows the system to operate.
^ If the air delivery is heater, defog or defrost the air mix two door will cycle between full hot and full cold.

CONDITIONS FOR CLEARING THE MIL/DTC
^ Using a scan tool.
^ A current DTC will clear when the diagnostic runs and does not fail.
^ IPM battery voltage is interrupted.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. This step determines whether the Body Control Module (BCM) Diagnostic System Check was performed.
3. This step ensures that the DTC was not set in error.
4. This step determines whether the cause of the malfunction is the sensor or an open or short in a circuit.
9. The scan to verifies proper sensor operation. Clear all the DTCs after the repair procedure is complete.