GM Service Manual Online
For 1990-2009 cars only

Step

Action

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Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Component Connector End Views

1

Did you review the Instrument Cluster Description and perform the necessary inspections?

Go to Step 2

Go to Instrument Cluster Description and Operation

2

Verify the outside temperature display is inaccurate or inoperative.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Measure the resistance between cavity 1 and 2 of the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Resistance for proper resistance specifications.

Is resistance within specs?

Go to Step 4

Go to Step 11

4

With the ignition in the ON position. Test cavity 1 of the ambient air temperature sensor harness connector for a 5-volt reference signal. Refer to Circuit Testing .

Is the voltage present?

Go to Step 5

Go Step 6

5

Test cavity 2 of the ambient temperature sensor harness connector for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 10

Go to Step 7

6

With the ignition in the ON position, test cavity 38 of the instrument panel cluster harness connector for a 5-volt reference signal. Refer to Circuit Testing .

Is the voltage present?

Go to Step 8

Go to Step 10

7

Test cavity 39 of the Instrument panel cluster harness connector for continuity to ground.

Is a ground present?

Go to Step 9

Go to Step 10

8

Repair the open or high resistance in 5-volt referance circuit between cavity 38 of the I/P cluster and caity 1 of the ambient air temperature sensor. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 12

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9

Repair the open or high resistance in the ambient temperature sensor ground circuit between cavity 39 of the I/P cluster and cavity 2 of the ambient temperature sensor Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 12

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10

Replace the instrument panel cluster. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

Go to Step 12

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11

Replace the ambient air temperature sensor.

Did you complete the repair?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3