GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Catera 🢒 Restraints 🢒 SIR 🢒 AIR BAG Warning Lamp Comes On Steady

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

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

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

    2.

  2. This step checks to see if sufficient voltage is being supplied to the SDM.

    3.

  3. This step checks to see if excessive voltage is being supplied to the SDM.

    4.

  4. This step checks to see if the CPA properly installs when the SDM wiring harness connector is connected to the SDM.

    5.

  5. This step checks the AIR BAG warning lamp control circuit, the SDM ground circuit, and the shorting bar.

    6.

  6. This step checks the SDM terminals and the shorting bar lifting tabs.

    7.

  7. This step checks for a short to ground in the AIR BAG warning lamp control circuit.

    8.

  8. This step determines if there is a short between the AIR BAG warning lamp control circuit and the SDM ground circuit.

    9.

  9. This step checks the SDM wiring harness connector.

    10.

  10. This step determines if there is an open or a high resistance in 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 23

--

4

Use the scan tool to request the SIR data list display.

Does the scan tool indicate that the ignition voltage is greater than the specified value?

10 V

Go to Step 5

Go to Step 17

5

  1. Set the parking brake.
  2. Start the engine.
  3. Use the scan tool to request the SIR data list display.

Does the scan tool indicate that the ignition voltage is greater than the specified value?

16 V

Go to Diagnostic System Check - Engine Electrical in Engine Electrical

Go to Step 6

6

  1. Turn OFF the ignition.
  2. 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 .
  3. Inspect the SDM wiring harness connector position assurance (CPA) to ensure that it properly installs when the SDM wiring harness connector is connected to the SDM.

Does the CPA properly install when the SDM wiring harness connector is connected to the SDM?

--

Go to Step 8

Go to Step 7

7

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

Did you complete the repair?

--

Go to Step 23

--

8
  1. Install the J 42113 SIR Shorting Bar Tool into the SDM wiring harness connector above the AIR BAG warning lamp control circuit and the SDM ground circuit.
  2. Turn ON the ignition, with the engine OFF.

Does the AIR BAG warning lamp come ON steady?

--

Go to Step 9

Go to Step 22

9

  1. Turn OFF the ignition.
  2. Remove the J 42113 .
  3. Inspect the AIR BAG warning lamp control circuit terminal, the SDM ground circuit terminal, and the shorting bar for the following conditions:
    4. • Corrosion
    • Damaged terminals
    • Poor connections/terminal tension

Does the AIR BAG warning lamp control circuit terminal, the SDM ground circuit terminal, or the shorting bar exhibit any signs of corrosion, terminal damage, or poor connections?

--

Go to Step 10

Go to Step 11

10

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

Did you complete the repair?

--

Go to Step 23

--

11

Carefully inspect the SDM terminals and the shorting bar lifting tabs for the following conditions:

    • Corrosion
    • Damaged terminals or lifting tabs
    • Poor connections

Does the SDM terminals or the shorting bar lifting tabs exhibit any signs of corrosion, terminal damage, shorting bar lifting tab damage, or poor connections?

--

Go to Step 22

Go to Step 12

12

  1. Install the J 42113 SIR Shorting Bar Tool into the SDM wiring harness connector above the AIR BAG warning lamp control circuit and the SDM ground circuit.
  2. Disconnect the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.
  3. Use the J 39200 Digital Multimeter (DMM) to measure the resistance between the AIR BAG warning lamp control circuit and a known good ground.

Does the resistance measure less than the specified value?

OL

Go to Step 13

Go to Step 16

13

  1. Disconnect the SDM ground circuit from ground G103. Refer to SIR Components .
  2. Use the J 39200 to measure the resistance between the AIR BAG warning lamp control circuit and the SDM ground circuit.

Does the resistance measure less than the specified value?

OL

Go to Step 15

Go to Step 14

14

Locate and repair a short to ground in the AIR BAG warning lamp control circuit.

Did you complete the repair?

--

Go to Step 23

--

15

Locate and repair a short between the AIR BAG warning lamp control circuit and the SDM ground circuit.

Did you complete the repair?

--

Go to Step 23

--

16

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

Did you complete the replacement?

--

Go to Step 23

--

17

  1. Turn OFF the ignition.
  2. 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 .
  3. Inspect the SDM wiring harness connector for the following conditions:
    4. • Corrosion
    • Damaged terminals
    • Poor connections/terminal tension

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

--

Go to Step 18

Go to Step 19

18

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

Did you complete the repair?

--

Go to Step 19

--

19

Inspect the SDM terminals for the following conditions:

    • Corrosion
    • Damaged terminals

Does the SDM exhibit any signs of corrosion or terminal damage?

--

Go to Step 22

Go to Step 20

20

  1. Disconnect the ignition switch wiring harness connector. Refer to Ignition Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.
  2. Use the DMM to measure the resistance of the ignition feed circuit.

Does the resistance measure more than the specified value?

0.5 ohms

Go to Step 21

Go to Step 22

21

Locate and repair an open or a high resistance in the ignition feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

22

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

Did you complete the replacement?

--

Go to Step 23

--

23
  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

--