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?

--

Go to Step 2

Go to Diagnostic System Check - Audible Warnings

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  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 Yes?

--

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

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the ignition switch connector.
  3. Connect a 3 amp fused jumper wire between the key in ignition signal circuit of the ignition switch and the ground circuit of the ignition switch.
  4. 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 Yes?

--

Go to Step 6

Go to Step 4

4

Test the key in ignition signal circuit for the following conditions:

    • An open
    • A short to voltage
    • A high resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 5

5

Test the key in ignition ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 7

6

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?

--

Go to Step 10

Go to Step 8

7

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?

--

Go to Step 10

Go to Step 9

8

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

Did you complete the replacement?

--

Go to Step 10

--

9

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

Did you complete the repair?

--

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2