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For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Montana 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Does Not Come On

Object Number: 417321 Size: SF
SIR Components
SIR Schematics
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
SIR Caution

Circuit Description

When the ignition switch is first turned to RUN, the IGN 1 Fuse applies battery voltage to the AIR BAG warning lamp that is connected to INFLATABLE RESTRAINT INDICATOR, terminal 6. The SIR Fuse applies battery voltage to the IGNITION input, terminal 5. The inflatable restraint sensing and diagnostic module (SDM) responds by flashing the AIR BAG warning lamp seven times.

When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections . When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair .

Test Description

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

  1. This step checks to see if the malfunction is in the inflatable restraint sensing and diagnostic module (SDM) circuitry or in the instrument cluster power feed circuitry.

    2.

  2. This step checks to see if voltage is present in the AIR BAG warning lamp circuit.

    3.

  3. This step checks to see if there is a short to B+ in CKT 358.

    4.

  4. This step checks to see if the instrument cluster wiring harness connector C2 is damaged or corroded.

    5.

  5. This step checks for an open or a high resistance in CKT 358.

    6.

  6. This step checks to see if power is available to the instrument cluster power feed circuit.

    7.

  7. This step determines if there is a short to ground in CKT 39 or if there is a malfunctioning instrument cluster.

    8.

  8. This step checks to see if the instrument cluster wiring harness connector C2 is damaged or corroded.

    9.

  9. This step determines if there is an open or a high resistance in CKT 39 or if there is an open or a high resistance in the power feed circuit to the IGN 1 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 turn ON?

--

Go to Step 3

Go to Step 11

3

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint steering wheel module coil and IP module yellow 2-way connectors.
  3. Disconnect the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  4. Install the J 42113 SIR Shorting Bar Tool to the SDM wiring harness connector above terminal 6 and terminal 7.
  5. Turn the ignition switch to the RUN position.
  6. Use the J 39200 Digital Multimeter (DMM) to measure the voltage between terminal 6 of the SDM wiring harness connector and a known good ground.

Is the measured 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 Replacement in Instrument Panel, Gauges and Console.
  3. Turn the ignition switch to the RUN position.
  4. Use the J 39200 to measure the voltage between terminal 6 of the SDM wiring harness connector and a known good ground.

Is the measured 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. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the repair 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 the instrument cluster connector C2 for a proper connection at terminal F.

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.

Is the repair complete?

--

Go to Step 22

--

8

Use the J 39200 to measure the resistance between terminal F of the instrument cluster connector C2 and terminal 6 of the SDM wiring harness connector.

Is the measured resistance within the specified value?

0-2 ohms

Go to Step 10

Go to Step 9

9
  1. Locate an open or a high resistance in CKT 358.
  2. Repair the open or the high resistance in CKT 358.
  3. Install the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 22

--

10

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

Is the repair complete?

--

Go to Step 22

--

11

  1. Turn the ignition switch to the OFF position.
  2. Remove the IGN 1 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 IGN 1 Fuse.
  5. Inspect the fuse.

Is the fuse good?

--

Go to Step 16

Go to Step 13

13

  1. Disconnect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Use the J 39200 to measure the resistance between terminal I of the instrument cluster connector C1 and a known good ground.

Is the measured resistance less than the specified value?

OL

Go to Step 14

Go to Step 15

14
  1. Locate a short to ground in CKT 39.
  2. Repair the short to ground in CKT 39.

Is the repair complete?

--

Go to Step 22

--

15
  1. Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Install the IGN 1 Fuse.

Is the repair complete?

--

Go to Step 22

--

16

Install the IGN 1 Fuse.

Is the repair complete?

--

Go to Step 22

--

17

  1. Disconnect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Check the instrument cluster connector C1 for a proper connection at terminal I.

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 Systems.

Is the repair complete?

--

Go to Step 22

--

19

Use the J 39200 to measure the resistance between terminal I of the instrument cluster connector C1 and each terminal of the IGN 1 Fuse fuseholder.

Is either reading within the specified value?

0-2 ohms

Go to Step 21

Go to Step 20

20
  1. Locate an open or a high resistance in CKT 39.
  2. Repair the open or high resistance in CKT 39.

Is the repair complete?

--

Go to Step 22

--

21
  1. Repair an open or a high resistance in the power feed circuit to the IGN 1 Fuse. Refer to Power Distribution Schematics in Wiring Systems.
  2. Install the IGN 1 Fuse.

Is the repair complete?

--

Go to Step 22

--

22

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

Have all the SIR components been reconnected and properly mounted?

--

Go to SIR Diagnostic System Check

--