GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Seat Belt System Check?

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Go to Step 2

Go to Seat Belt System Check

2

  1. Using a scan tool establish communication with the inflatable restraint sensing and diagnostic module (SDM).
  2. Pull up Special Functions in Instrument Panel Cluster.
  3. Go to WOW Instrument Cluster in Output Control.
  4. In the WOW mode you can turn ON or OFF the instrument panel indicators.
  5. All indicators will turn ON when commanded on.

Does the scan tool command the FASTEN SEAT BELTS Warning Indicator ON then OFF?

--

Go to Step 4

Go to Step 3

3

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

Is the IPC replacement complete?

--

Go to Seat Belt System Check

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4

  1. Unbuckle the LH seat belt.
  2. Disconnect the SDM connector.
  3. Connect a digital multimeter (DMM) between the SDM connector cavity 1 (BLK/WHT) and ground.

Is the resistance near the specified value?

5 ohms

Go to Step 5

Go to Step 7

5

Test for proper terminal contact at the SDM connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Is the terminal contact OK?

--

Go to Step 13

Go to Step 6

6

Repair the appropriate terminals. Refer to Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to Seat Belt System Check

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7

Connect a DMM between the SDM connector cavity 1 (BLK/WHT) and the LH seat belt switch connector cavity A (BLK/WHT).

Is the resistance near the specified value?

5 ohms

Go to Step 9

Go to Step 8

8

Repair the open in CKT 238 (BLK/WHT). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Seat Belt System Check

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9

Connect a DMM between the SDM connector cavity 1 (BLK/WHT) and the LH seat belt switch connector cavity B (BLK).

Is the resistance near the specified value?

5 ohms

Go to Step 11

Go to Step 10

10

Test for proper terminal contact at the LH seat switch connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Is the terminal contact OK?

--

Go to Step 12

Go to Step 6

11

Repair the open in CKT 850 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Seat Belt System Check

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12

Replace the LH front seat belt switch.

Is the seat belt switch replacement complete?

--

Go to Seat Belt System Check

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13

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

Is the SDM replacement complete?

--

Go to Seat Belt System Check

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