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For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Does Not Come On

Object Number: 220918 Size: SF
SIR Components
SIR Schematics
SIR Caution
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The ignition switch supplies Ignition 1 voltage to the inflatable restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the AIR BAG Fuse. The ignition switch also supplies Ignition 1 voltage to the AIR BAG warning lamp using the GAGES Fuse. The AIR BAG warning lamp is connected to the INFLATABLE RESTRAINT INDICATOR at terminal 7 of the SDM. When the ignition switch is first turned to RUN, the SDM responds by flashing the AIR BAG warning lamp seven times.

When measurements are requested in this table, use the J 39200 DMM with the correct terminal adapter from the J 35616 Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Testing for Electrical Intermittents in Wiring Systems. When a wire, connector or terminal repair is requested, use the J-38125 Terminal Repair Kit and refer to Wiring Repairs in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. This test determines whether the malfunction is in the inflatable restraint Sensing and Diagnostic Module (SDM) circuitry or in the instrument cluster power feed circuitry.

    2.

  2. This test determines whether voltage is present in the warning lamp circuit.

    3.

  3. This test isolates CKT 358 and checks for a short in CKT 358 to B+.

    4.

  4. This test determines if the malfunction is in the instrument cluster connector.

    5.

  5. This test isolates an open in the warning lamp circuitry.

    6.

  6. This test checks whether power is available to the instrument cluster power feed circuit.

    7.

  7. This test checks for a short from the instrument cluster power feed circuit to ground.

    8.

  8. This test determines whether the short to ground is due to a short in the wiring or internal to the instrument cluster.

    9.

  9. This test determines if the malfunction is in the instrument cluster connector.

    10.

  10. This test determines whether the malfunction is due to an open power feed circuit from the GAGES Fuse.

Air Bag Warning Lamp Does Not Come On

Step

Action

Value(s)

Yes

No

1

Was the SIR Diagnostic System Check performed?

--

Go to Step 2

Go to SIR Diagnostic System Check

2

  1. Set the parking brake.
  2. Turn the ignition switch to the RUN position.

Does the BRAKE indicator light?

--

Go to Step 3

Go to Step 13

3

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint steering wheel and IP module yellow 2-way connectors located at the base of the steering column and behind the IP compartment door.
  3. Disconnect the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  4. Install J 38715-96 SIR Shorting Bar Tool to the SDM harness connector.
  5. Install the CPA.
  6. Turn the ignition switch to the RUN position.
  7. Measure the voltage on the SDM harness connector from terminal 7 to ground.

Is the voltage more than the specified value?

10.0 V

Go to Step 4

Go to Step 6

4

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the instrument cluster. Refer to Instrument Cluster in Instrument Panel, Gauges and Console.
  3. Turn the ignition switch to the RUN position.
  4. Measure the voltage on the SDM harness connector from terminal 7 to ground.

Is the voltage less than the specified value?

1.0 V

Go to Sensing and Diagnostic Module Integrity Check

Go to Step 5

5
  1. Turn the ignition switch to the OFF position.
  2. Repair a short-to-B+ condition in CKT 358.
  3. Reconnect the instrument cluster.

Are the repairs complete?

--

Go to Step 22

--

6

  1. Turn the ignition switch to the OFF position.
  2. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Check for proper connection to the instrument cluster at terminal A7.

Is the connector damaged or corroded?

--

Go to Step 7

Go to Step 8

7

Repair the instrument cluster harness connector. Refer to Connector Repairs in Wiring Repairs.

Are the repairs complete?

--

Go to Step 22

--

8

Measure the resistance from the instrument cluster harness connector terminal A7 to the SDM harness connector terminal 7.

Is the resistance within the specified values?

0-5 ohms

Go to Step 10

Go to Step 9

9
  1. Repair an open condition in CKT 358.
  2. Install the instrument cluster.

Are the repairs complete?

--

Go to Step 22

--

10

Service the instrument cluster. Refer to Instrument Cluster in Instrument Panel, Gauges and Console.

Are the repairs complete?

--

Go to Step 22

--

11

  1. Turn the ignition switch to the OFF position.
  2. Remove the GAGES Fuse.
  3. Inspect the fuse.

Is the fuse good?

--

Go to Step 17

Go to Step 12

12

  1. Replace the fuse.
  2. Turn the ignition switch to the RUN position for 10 seconds.
  3. Turn the ignition switch to the OFF position.
  4. Remove the GAGES Fuse.
  5. Inspect the fuse.

Is the fuse good?

--

Go to Step 16

Go to Step 13

13

  1. Disconnect the inflatable restraint steering wheel and IP module yellow 2-way connectors located at the base of the steering wheel and behind the IP compartment door.
  2. Disconnect the instrument cluster. Refer to Instrument Cluster in Instrument Panel, Gauges and Console.
  3. Replace the GAGES Fuse.
  4. Turn the ignition switch to the RUN position for 10 seconds.
  5. Turn the ignition switch to the OFF position.
  6. Remove the GAGES Fuse.
  7. Inspect the fuse.

Is the fuse good?

--

Go to Step 15

Go to Step 14

14

  1. Repair a short-to-ground condition in CKT 39.
  2. Replace the GAGES Fuse.

Are the repairs complete?

--

Go to Step 22

--

15
  1. Service the instrument cluster. Refer to Instrument Cluster in Instrument Panel, Gauges and Console.
  2. Install the GAGES Fuse.

Are the repairs complete?

--

Go to Step 22

--

16

Install the GAGES Fuse.

Are the repairs complete?

--

Go to Step 22

--

17

  1. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Check for proper connection to the instrument cluster at terminal A5.

Is the connector damaged or corroded?

--

Go to Step 18

Go to Step 19

18

Repair the instrument cluster harness connector. Refer to Connector Repairs in Wiring Repairs.

Are the repairs complete?

--

Go to Step 22

--

19

Measure the resistance between the instrument cluster harness connector terminal A5 to each terminal of the GAGES Fuse fuseholder.

Is either reading within the specified values?

0-5 ohms

Go to Step 21

Go to Step 20

20
  1. Repair an open condition in CKT 39.
  2. Install the GAGES Fuse.

Are the repairs complete?

--

Go to Step 22

--

21
  1. Repair an open condition in the power feed to the GAGES Fuse.
  2. Install the GAGES Fuse.

Are the repairs complete?

--

Go to Step 22

--

22

Reconnect all the SIR system components, make sure all the components are properly mounted.

Have all the SIR components been reconnected and properly mounted?

--

Go to SIR Diagnostic System Check

--