GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Catera 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Does Not Come On

Object Number: 601095 Size: SF
SIR Components
Power, Ground, Serial Data, Indicator and Front Inflatable Restraint Modules
Fuel, Brake to Shift, Airbag, Check Engine, and Cruise Indicators
Ignition Switch and Fuse Block
SIR Handling Caution
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn ON the ignition, the CLAMP 15 CRUISE Fuse applies battery voltage to the AIR BAG warning lamp. The AIR BAG warning lamp is controlled by the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM). The ignition switch supplies battery voltage to the SDM, at terminal 5. The SDM responds by flashing the AIR BAG warning lamp seven times and then turning it OFF. The SDM monitors the AIR BAG warning lamp control circuit by comparing the output state of the AIR BAG warning lamp control circuit, at terminal 6, of the SDM, to the microprocessor commanded state.

Diagnostic Aids

In order to disable the shorting bar above the AIR BAG warning lamp control circuit inside of the SDM wiring harness connector, the SDM wiring harness connector musty be properly connected to the SDM. Also, the connector assurance position (CPA) must be installed properly. Inspect the SDM wiring harness connector, the shorting bars and the CPA to ensure that the SDM wiring harness connector properly connects to the SDM.

Test Description

  1. This step checks to see if DTC 43 or DTC 44 is present.

    2.

  2. This step checks the instrument cluster wiring harness connector.

    3.

  3. This step checks the instrument cluster terminals.

    4.

  4. This step checks the AIR BAG warning lamp.

    5.

  5. This step checks the AIR BAG warning lamp socket within the instrument cluster.

    6.

  6. This step checks the SDM wiring harness connector.

    7.

  7. This step checks the SDM terminals.

    8.

  8. This step checks for an open or a high resistance in the AIR BAG warning lamp control circuit.

    9.

  9. This step determines if there is an open or a high resistance in the ignition feed circuit or if there is a malfunctioning SDM.

Step

Action

Value(s)

Yes

No

1

Did you perform A Diagnostic System Check - SIR?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Install a scan tool.
  2. Use the scan tool to request the SIR DTC display.

Does the scan tool indicate that either DTC 43 or DTC 44 is present?

--

Go to Step 3

Go to Step 4

3
  1. If DTC 43 is present, refer to DTC 43 Warning Lamp Circuit Short to Voltage .
  2. If DTC 44 is present, refer to DTC 44 Warning Lamp Circuit Open or Short to GND .

Did you complete the repair?

--

Go to Step 19

--

4

  1. Turn OFF the ignition.
  2. Disconnect the instrument cluster wiring harness connector. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Inspect the instrument cluster wiring harness connector for the following conditions:
    4. • Corrosion
    • Damaged terminals
    • Poor connections/terminal tension

Does the instrument cluster wiring harness connector exhibit signs of corrosion, terminal damage, or poor connections?

--

Go to Step 5

Go to Step 6

5

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

Did you complete the repair?

--

Go to Step 6

--

6

Inspect the instrument cluster terminals for the following connections:

    • Corrosion
    • Damaged terminals

Does the instrument cluster exhibit signs of corrosion or damaged terminals?

--

Go to Step 17

Go to Step 7

7

Remove and inspect the AIR BAG warning lamp.

Is the AIR BAG warning lamp OK?

--

Go to Step 9

Go to Step 8

8

Replace the AIR BAG warning lamp.

Did you complete the replacement?

--

Go to Step 19

--

9

Inspect the AIR BAG warning lamp socket within the instrument cluster for the following conditions:

    • Corrosion
    • Damaged terminals
    • Poor connections/terminal tension

Does the AIR BAG warning lamp socket exhibit any signs of corrosion, terminal damage, or poor connections?

--

Go to Step 17

Go to Step 10

10

  1. Disconnect the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement .
  2. Inspect the SDM wiring harness connector for the following conditions:
  3. Corrosion
  4. Damaged terminals
  5. Poor connections/terminal tension

Does the SDM wiring harness connector exhibit any signs of corrosion, terminal damage, or poor connections?

--

Go to Step 11

Go to Step 12

11

Replace the SDM wiring harness connector. Refer to Connector Repairs in Wiring Systems.

Did you complete the replacement?

--

Go to Step 12

--

12

Inspect the SDM terminals for the following connections:

    • Corrosion
    • Damaged terminals

Does the SDM exhibit signs of corrosion or damaged terminals?

--

Go to Step 18

Go to Step 13

13

Use the J 39200 Digital Multimeter (DMM) to measure the resistance of the AIR BAG warning lamp control circuit.

Does the resistance measure less than the specified value?

0.5 ohms

Go to Step 15

Go to Step 14

14

Locate and repair an open or high resistance in the AIR BAG warning lamp control circuit.

Did you complete the repair?

--

Go to Step 19

--

15

  1. Connect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the DMM to measure the voltage between the ignition feed circuit and a known good ground.

Does the voltage measure within the specified value?

B+

Go to Step 18

Go to Step 16

16

Locate and repair an open or a high resistance in the ignition feed circuit.

Did you complete the repair?

--

Go to Step 19

--

17

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

Did you complete the replacement?

--

Go to Step 19

--

18

Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement .

Did you complete the replacement?

--

Go to Step 19

--

19
  1. Reconnect all SIR components.
  2. Verify that all components and connectors are properly mounted.
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool in order to clear the DTCs.

Did you complete the action?

--

Go to Diagnostic System Check - SIR

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