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

2

  1. Fasten the driver's seat belt switch.
  2. Disconnect the body control module (SBM) connector C2.
  3. Turn the ignition switch to RUN.

Is the FASTEN BELTS indicator on?

--

Go to Step 3

Go to Step 6

3

Test for a short to ground on CKT 234 (YEL).

Is the circuit shorted?

--

Go to Step 4

Go to Step 5

4

Repair CKT 234 (YEL).

Did you complete the repair?

--

Go to Diagnostic System Check - Instrument Cluster

--

5

Repair or replace the instrument cluster.

Did you complete the repair?

--

Go to Diagnostic System Check - Instrument Cluster

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6

  1. Connect SBM connector C2.
  2. Turn the ignition switch to RUN.
  3. Connect a scan tool.
  4. Use the SBM Data List Outputs Function on the scan tool in order to turn on and off the FASTEN BELTS indicator.

Does the indicator turn on and off when commanded?

--

Go to Step 8

Go to Step 7

7

Replace the SBM.

Did you complete the repair?

--

Go to Diagnostic System Check - Instrument Cluster

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8

Repair SBM connector C2.

Did you complete the repair?

--

Go to Diagnostic System Check - Instrument Cluster

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