GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Monte Carlo 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Does Not Come On

Object Number: 212610 Size: SF
SIR Components new
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 Fuse 21. The ignition switch also supplies Ignition 1 voltage to the AIR BAG warning lamp using Fuse 39. 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 7 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 determines if the open is due to a bad bulb.

    6.

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

    7.

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

    8.

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

    9.

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

    10.

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

    11.

  11. This test determines whether the malfunction is due to an open power feed circuit from Fuse 39.

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 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 IP Cluster Replacement in Instrument Panel, Gages 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 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 24

--

6

  1. Turn the ignition switch to the OFF position.
  2. Remove the instrument cluster. Refer to IP Cluster Replacement in Instrument Panel, Gages and Console.
  3. Check for proper connection to the instrument cluster at terminal C15.

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 Systems.

Are the repairs complete?

--

Go to Step 24

--

8

  1. Remove the AIR BAG warning lamp bulb. Refer to IP Cluster Indicator Lamps Replacement in Instrument Panel, Gages and Console.
  2. Inspect the bulb.

Is the bulb good?

--

Go to Step 10

Go to Step 9

9
  1. Replace the AIR BAG warning lamp bulb. Refer to AIR BAG Indicator Replacement .
  2. Install the instrument cluster.

Are the repairs complete?

--

Go to Step 24

--

10

  1. Install the AIR BAG warning lamp bulb.
  2. Measure the resistance from the instrument cluster harness connector terminal C15 to the SDM harness connector terminal 7.

Is the resistance within the specified values?

0-5 ohms

Go to Step 12

Go to Step 11

11
  1. Repair an open condition in CKT 358.
  2. Install the instrument cluster.

Are the repairs complete?

--

Go to Step 24

--

12

Service the instrument cluster. Refer to IP Cluster Replacement in Instrument Panel, Gages and Console.

Are the repairs complete?

--

Go to Step 24

--

13

  1. Turn the ignition switch to the OFF position.
  2. Remove Fuse 39.
  3. Inspect the fuse.

Is the fuse good?

--

Go to Step 19

Go to Step 14

14

  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 Fuse 39.
  5. Inspect the fuse.

Is the fuse good?

--

Go to Step 18

Go to Step 15

15

  1. Disconnect the inflatable restraint steering wheel and IP module yellow 2-way connectors at the base of the steering wheel and behind the IP compartment door.
  2. Disconnect the instrument cluster. Refer to IP Cluster Replacement in Instrument Panel, Gages and Console.
  3. Replace Fuse 39.
  4. Turn the ignition switch to the RUN position for 10 seconds.
  5. Turn the ignition switch to the OFF position.
  6. Remove Fuse 39.
  7. Inspect the fuse.

Is the fuse good?

--

Go to Step 17

Go to Step 16

16
  1. Repair a short-to-ground condition in CKT 39.
  2. Replace Fuse 39.

Are the repairs complete?

--

Go to Step 24

--

17
  1. Service the instrument cluster. Refer to IP Cluster Replacement in Instrument Panel, Gages and Console.
  2. Install Fuse 39.

Are the repairs complete?

--

Go to Step 24

--

18

Install Fuse 39.

Are the repairs complete?

--

Go to Step 24

--

19

  1. Remove the instrument cluster. Refer to IP Cluster Replacement in Instrument Panel, Gages and Console.
  2. Check for proper connection to the instrument cluster at terminal C1.

Is the connector damaged or corroded?

--

Go to Step 20

Go to Step 21

20

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

Are the repairs complete?

--

Go to Step 24

--

21

Measure the resistance between the instrument cluster harness connector terminal C1 to each terminal of Fuse 39 fuseholder.

Is either reading within the specified values?

0-5 ohms

Go to Step 23

Go to Step 22

22
  1. Repair an open condition in CKT 39.
  2. Install Fuse 39.

Are the repairs complete?

--

Go to Step 24

--

23
  1. Repair an open condition in the power feed to Fuse 39.
  2. Install Fuse 39.

Are the repairs complete?

--

Go to Step 24

--

24

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

--