GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Definition: The fasten-belts indicator lamp in the instrument panel does not turn on under the following conditions:

    • The ignition key is in the RUN position
    • The driver's seat belt is unfastened

However the BCM sounds the reminder chime for 4-8 seconds.

1

  1. Turn the ignition switch to the RUN position.
  2. Observe the instrument cluster gages and indicators.

Do the instrument cluster gages and indicators operate normally?

--

Go to Step 2

Go to Diagnostic System Check - Body Control System

2

Was the Body Control Module (BCM) System Check performed?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System

3

  1. Disconnect the BCM electrical connector C2.
  2. Connect a fused (5-amp) jumper between B+ and the BCM harness connector C2 terminal D12.
  3. Observe the fasten-belts indicator lamp.

Is the fasten-belts indicator lamp on?

--

Go to Step 7

Go to Step 4

4

  1. Remove the instrument cluster.
  2. Remove the fasten-belts indicator lamp bulb from the instrument cluster.
  3. Inspect the filament of the bulb.

Is the lamp filament open?

--

Go to Step 8

Go to Step 5

5

Using a J 39200 digital multimeter (DMM), measure the resistance between the BCM harness connector C2 terminal D12 and the instrument cluster harness connector C2 terminal L.

Is the resistance less than the specified value?

2 ohms

Go to Step 6

Go to Step 9

6

Using a test lamp, connect between B+ and the instrument cluster harness connector C2 terminal O.

Is the test lamp illuminated?

--

Go to Step 10

Go to Step 11

7

  1. Inspect the BCM connector C2 terminal D12.
  2. If the connector is OK, replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.

Is the repair complete?

--

Go to Step 12

--

8

Replace the fasten-belts indicator lamp bulb. Refer to Instrument Cluster Bulb Replacement .

Is the repair complete?

--

Go to Step 12

--

9

Repair poor connection or open in CKT 529.

Is the repair complete?

--

Go to Step 12

--

10

The fasten-belts indicator lamp does not illuminate due to a malfunction in the instrument cluster. Refer to Instrument Cluster System Check for the diagnosis and repair of the instrument cluster.

Is the repair complete?

--

Go to Step 12

--

11

Repair poor connection or open in CKT 1450.

Is the repair complete?

--

Go to Step 12

--

12

  1. Turn the ignition switch to the LOCK position.
  2. Reinstall the connectors and the components which you removed.
  3. Turn the ignition switch to the RUN position for 6 seconds.
  4. Remove the BCM PRGRM fuse.
  5. Turn the ignition switch to the ACC position. The BCM sounds the chime several times equivalent to the BCM type which is installed on the vehicle.
  6. Within 1 second, turn the ignition switch from the ACC position to the LOCK position, then back to the ACC position. The BCM sounds any DTCs stored.

Are any BCM DTCs present?

--

Go to Diagnostic System Check - Body Control System

System OK