GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Audible Warnings Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Audible Warnings

2

  1. Install a scan tool.
  2. Remove the key from the ignition, if necessary.
  3. With the scan tool, observe the Key In Ignition parameter in the Instrument panel integration module (IPM) data list.

Does the scan tool indicate that the Key In Ignition parameter is No?

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Go to Diagnostic System Check - Radio/Audio System in Entertainment

Go to Step 3

3

  1. Disconnect the ignition switch connector.
  2. With the scan tool, observe the Key In Ignition parameter in the Instrument panel integration module (IPM) data list.

Does the scan tool indicate that the Key In Ignition parameter is No?

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Go to Step 5

Go to Step 4

4

Test the key in ignition switch signal circuit harness for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 9

Go to Step 6

5

Inspect for poor connections at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 9

Go to Step 7

6

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

Did you find and correct the condition?

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Go to Step 9

Go to Step 8

7

Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Instrument Panel, Gauges and Console.

Did you complete the replacement?

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Go to Step 9

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8

Replace the IPM. Refer to Instrument Panel Module Replacement in Body Control System.

Did you complete the repair?

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Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2