B1332

Schematic:

CIRCUIT DESCRIPTION
The left heater temperature sensor is a thermistor that controls signal voltage to the Instrument Panel Integration Module (IPM). The IPM supplies voltage on circuit 518. 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.
^ The circuit is open or shorted.

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 one 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

Steps 1-9:

The numbers below refer to the step numbers on the diagnostic table.
1. Perform the Body Control Module (BCM) Diagnostic System Check before continuing with the diagnosis of this DTC.Initial Inspection and Diagnostic Overview
3. Ensures that the DTC was not set in error.
4. Determines whether the cause of the malfunction is the sensor or an open or short in a circuit.
9. The Scan Tool checks for proper sensor operation. Clear all the DTCs after the repair procedure is complete.