GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn the ignition OFF.
  2. Disconnect the ambient air temperature sensor.
  3. Connect a 3-ampere fused jumper wire between the signal circuit and the ground circuit of the ambient air temperature sensor.
  4. Turn the ignition ON, with the engine OFF.

Does the driver information center (DIC) display SC?

Go to Step 5

Go to Step 3

3

Test the signal circuit of the ambient air temperature sensor for a short to voltage, for a high resistance, or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 4

4

Test the ground circuit of the ambient air temperature sensor for a high resistance, for a short to voltage, or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the harness connector of the ambient air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement in HVAC Systems-Automatic.

Did you complete the replacement?

Go to Step 9

--

8

Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

--

9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2