GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console

2

  1. Buckle the driver seat belt.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the fasten seat belt indicator on the instrument cluster.

Does the indicator remain illuminated after the bulb test?

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Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Driver Side Belt Status parameter in the Supplemental Inflatable Restraint data list.

Does the scan tool display belted?

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Go to Step 10

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the seat belt switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Driver Side Belt Status parameter.

Does the scan tool display belted?

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Go to Step 6

Go to Step 5

5

Test the signal circuit of the seat belt switch 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 11

Go to Step 7

6

Inspect for poor connections at the harness connector of the seat belt 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 11

Go to Step 8

7

Inspect for poor connections at the harness connector of the inflatable restraint sensing and diagnostic module (SDM). 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 11

Go to Step 9

8

Replace the seat belt switch. Refer to Seat Belt Buckle Replacement - Left Front .

Did you complete the replacement?

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Go to Step 11

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9

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the replacement?

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Go to Step 11

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10

Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Did you complete the replacement?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3