B1310

Schematic:

CIRCUIT DESCRIPTION
The Ambient Temperature Sensor is a thermistor that controls signal voltage to the Instrument Panel Integration Module (IPM). The IPM supplies voltage on circuit 735. When the sensor is cold, the resistance is high and the IPM will sense a high signal voltage at terminal B1, 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 shorted.

ACTION TAKEN WHEN THE DTC SETS
^ A blank is displayed on the drivers information center.
^ A default value of 15 °c (59 °F) will be used by the IPM to allow operation of the A/C system.

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 Diagnostic (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 malfunction is the sensor or if there is an open or a short in a circuit.
7. Determines if the IPM is malfunctioning.
9. The Scan Tool checks for proper sensor operation. Clear all DTCs after the repair procedures are complete.