Pinpoint Tests AS: The Outside Air Temperature Display Is Inoperative/Incorrect

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AS: The Outside Air Temperature Display Is Inoperative/Incorrect

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number

Normal Operation

The ambient air temperature sensor is hardwired to the PCM through separate input and return circuits. The PCM provides a reference voltage to the ambient air temperature sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature. The PCM messages the raw ambient air temperature data to the HVAC module through the Body Control Module (BCM). The HVAC then filters the data and sends the modified ambient temperature data to the Instrument Panel Cluster (IPC) through the BCM in degrees Celsius (metric). When the Fahrenheit (English) display is selected by the driver, the IPC converts the Celsius to Fahrenheit and displays the temperature in the message center.

This pinpoint test is intended to diagnose the following:

- Communication concern
- PCM concern

PINPOINT TEST AS: THE OUTSIDE AIR TEMPERATURE DISPLAY IS INOPERATIVE/INCORRECT

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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AS1 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Are any DTCs recorded?

Yes
For DTC U0140:00, GO to Pinpoint Test BF. For DTC U0424:82, GO to Pinpoint Test BJ. For all other DTCs, REFER to DTC Charts. Pinpoint Tests BF: DTC U0140:00 Pinpoint Tests BJ: DTC U0424:82

No
GO to AS2.

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AS2 RETRIEVE THE RECORDED DTCs FROM THE HVAC MODULE SELF-TEST

- Check for recorded HVAC module DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to Climate Control System - General Information and Diagnostics Testing and Inspection.

No
GO to AS3.

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AS3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any ambient temperature sensor DTCs recorded?

Yes
REFER to Computers and Control Systems.

No
INSTALL a new ambient temperature sensor. TEST the system for normal operation.

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