GM Service Manual Online
For 1990-2009 cars only

Diagnostic Aids

The chime module is located under the right side of the A-pillar.

Step

Action

Values

Yes

No

1

  1. Unbuckle the seat belt.
  2. Close the door of the vehicle.
  3. Turn ON the ignition.

Is the seat belt warning chime OK?

--

Go to Step 2

Go to Fasten Safety Belt Indicator Malfunction

2

  1. Disconnect the seat belt switch connector, located under the drivers seat.
  2. Connect a jumper between terminals on the harness side of the seat belt switch connector.
  3. Turn ON the ignition switch.

Does the seat belt warning lamp turn ON?

--

Go to Step 3

Go to Step 4

3

Replace the seat belt switch.

Is the repair complete?

--

System OK

--

4

  1. Turn OFF the ignition switch.
  2. Disconnect the drivers seat belt switch connector.
  3. Using an ohmmeter, measure the resistance between the ground and terminal 2 of the seat belt switch connector.

Is the resistance equal to the specified value?

0 ohms

Go to Step 6

Go to Step 5

5

Repair open circuit between terminal 2 of the seat belt switch and ground.

Is the repair complete?

--

System OK

--

6

  1. Remove instrument cluster.
  2. Inspect the seat belt warning lamp bulb.

Is the bulb OK?

--

Go to Step 8

Go to Step 7

7

Replace the warning lamp bulb.

Is the replacement complete?

--

System OK

--

8

Measure the voltage of terminal A20 of the instrument cluster.

Is the voltage equal to the specified value?

11-14 V

Go to Step 10

Go to Step 9

9

Repair the open circuit between terminal A20 of the instrument cluster and fuse F16.

Is the repair complete?

--

System OK

--

10

Repair the open circuit between terminal A1 of the instrument cluster and terminal 1 of the seat belt switch.

Is the repair complete?

--

System OK

--